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Uri V, Kukumägi M, Aosaar J, Varik M, Becker H, Aun K, Lõhmus K, Soosaar K, Uri M, Buht M, Sepaste A, Padari A. Reply to A. Lõhmus, 2022 letter to the editor regarding Uri et al. (2022): The dynamics of the carbon storage and fluxes in Scots pine (Pinus sylvestris) chronosequence. Sci Total Environ 2022; 844:156847. [PMID: 35780886 DOI: 10.1016/j.scitotenv.2022.156847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/15/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Affiliation(s)
- Veiko Uri
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia.
| | - Mai Kukumägi
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia; Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Jürgen Aosaar
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Mats Varik
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Hardo Becker
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Kristiina Aun
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Krista Lõhmus
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia
| | - Kaido Soosaar
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia
| | - Marek Uri
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Mikko Buht
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Agnes Sepaste
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Allar Padari
- Estonian University of Life Sciences, Institute of Forestry and Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
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Uri V, Kukumägi M, Aosaar J, Varik M, Becker H, Aun K, Lõhmus K, Soosaar K, Astover A, Uri M, Buht M, Sepaste A, Padari A. The dynamics of the carbon storage and fluxes in Scots pine (Pinus sylvestris) chronosequence. Sci Total Environ 2022; 817:152973. [PMID: 35007591 DOI: 10.1016/j.scitotenv.2022.152973] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/04/2022] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
To evaluate the impact of stand age on the ecosystem's C budget, as well as the post-harvest recovery of the C storages and fluxes, a chronosequence of Scots pine stands from the clear-cut stage up to the age of 110 years was studied. An age-related trend of net primary production (NPP) demonstrated effective C accumulation in the young and middle-aged stands and their levelling out thereafter. The understorey vegetation contributed 8-46% to total NPP, being lower in the pole and middle-aged stands, but without a clear age related trend. Annual cumulative soil heterotrophic respiration (Rh) demonstrated stable values along the chronosequence, varying between 3.8 and 5.4 t C ha-1 yr-1. The Rh flux of 2.9 t C ha-1 yr-1 at the clear-cut site did not exceed the corresponding value for stands. The NEP along the chronosequence followed the dynamics of the annual biomass production of the trees, peaking at the middle-aged stage and decreasing in the older stands; the NPP of the trees was the main driver directing the dynamics of NEP. There was no significant correlation between Rh and dynamics of aboveground litter or fine root production, which can partly explain why no relationship was established between annual Rh and stand age. The total ecosystem C stocks followed the same trend as cumulative tree biomass, peaking in the older stands, however, the soil C stocks varied along the chronosequence irrespective of stand age. The post-harvest C compensation point was reached at the age of 7-years and C payback occurred at a stand age of 11-12 years. Stands acted as C accumulating ecosystems and average annual C accumulation was around 2.5 t C ha-1 yr-1, except for the youngest stand and the clear-cut area which acted as C sources. In the oldest stand C budget was almost balanced, with a modest annual accumulation of 0.12 t C ha-1 yr-1.
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Affiliation(s)
- Veiko Uri
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia.
| | - Mai Kukumägi
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia; Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Jürgen Aosaar
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Mats Varik
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Hardo Becker
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Kristiina Aun
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Krista Lõhmus
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia
| | - Kaido Soosaar
- University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014 Tartu, Estonia
| | - Alar Astover
- Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Marek Uri
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Mikko Buht
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Agnes Sepaste
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Allar Padari
- Estonian University of Life Sciences, Institute of Forestry and Rural Engineering, Kreutzwaldi 5, 51014 Tartu, Estonia
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Rosenvald K, Lõhmus K, Kukumägi M, Ostonen I, Kaasik A, Tullus T, Tullus A. The initial overreaction of carbon cycle to elevated atmospheric humidity levels off over time - a FAHM study in a young birch forest. Sci Total Environ 2021; 796:148917. [PMID: 34271376 DOI: 10.1016/j.scitotenv.2021.148917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 06/30/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Ecosystem responses to climate change are mainly predicted based on short-term studies. However, the first response can be a temporary overreaction, different from the later response of the more acclimated ecosystem. The current paper is a follow-up study of our previous article, where the effect of elevated atmospheric humidity on forest ecosystem carbon (C) balance was studied in a young silver birch (Betula pendula Roth) forest after two years of humidification. Here, we present the C balance of the same forest measured two years later when humidification treatment had been performed for four years. We revealed that the higher C sequestration capacity of the humidified birch forest ecosystem was an initial overreaction, which levelled off after four years of humidification, when the ecosystem became more acclimated to wetter conditions. Understorey production reacted rapidly and strongly by increasing belowground production more than twofold, but this reaction ceased after four years of humidification treatment. Trees responded to a lesser extent, and the initially decreased aboveground growth was recovered after four years of humidification, when the biomass allocation to tree fine-roots was increased. Our results showed that at early forest age, understorey plant production dominated in the whole ecosystem C sequestration capacity. But in the later stage, the most important C sink was biomass production of birches, and since the tree biomass production no longer differed between the treatments, C sequestration of the whole ecosystem did not differ either. The findings confirm that a preliminary reaction of an ecosystem can be different from the later response, which needs to be taken into account when prognosing the climate change consequences for carbon sequestration.
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Affiliation(s)
- Katrin Rosenvald
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
| | - Krista Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
| | - Mai Kukumägi
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
| | - Ivika Ostonen
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
| | - Ants Kaasik
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
| | - Tea Tullus
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51006, Estonia.
| | - Arvo Tullus
- Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu 51003, Estonia.
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Wilfahrt PA, Schweiger AH, Abrantes N, Arfin‐Khan MAS, Bahn M, Berauer BJ, Bierbaumer M, Djukic I, Dusseldorp M, Eibes P, Estiarte M, Hessberg A, Holub P, Ingrisch J, Schmidt IK, Kesic L, Klem K, Kröel‐Dulay G, Larsen KS, Lõhmus K, Mänd P, Orbán I, Orlovic S, Peñuelas J, Reinthaler D, Radujković D, Schuchardt M, Schweiger JM, Stojnic S, Tietema A, Urban O, Vicca S, Jentsch A. Disentangling climate from soil nutrient effects on plant biomass production using a multispecies phytometer. Ecosphere 2021. [DOI: 10.1002/ecs2.3719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Rosenvald K, Lõhmus K, Rohula-Okunev G, Lutter R, Kupper P, Tullus A. Elevated atmospheric humidity prolongs active growth period and increases leaf nitrogen resorption efficiency of silver birch. Oecologia 2020; 193:449-460. [PMID: 32556592 DOI: 10.1007/s00442-020-04688-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 06/10/2020] [Indexed: 10/24/2022]
Abstract
Climate models predict increasing amounts of precipitation and relative atmospheric humidity for high latitudes in the Northern Hemisphere. Therefore, tree species must adjust to the new climatic conditions. We studied young silver birches (Betula pendula Roth) in a long-term (2012-2018) free air humidity manipulation experiment, with the aim of clarifying the acclimation mechanisms to elevated relative atmospheric humidity. In 2016-2018, stem radial increment (measured by dendrometers) and leaf abscission were monitored, and the leaf N and P resorption efficiencies were determined. Biomass allocation was estimated, and the seasonal dynamics of foliar NPK storage was assessed. Humidification increased N resorption efficiency by 11%. The annual means of N resorption efficiency varied from 41 to 52% in control and from 50 to 59% in humidified stands. The P resorption efficiency was strongly affected by weather conditions and varied between years from 25 to 66%. Higher foliar NPK storages at the end of growing season and delayed leaf fall allowed to extend the growth period in humidified plots, which resulted in a week longer stem radial growth. Although stem diameter growth of humidified birches recovered after 5 years, tree height retardation persisted over the seven study years, resulting in increased stem taper (diameter to height ratio) under humidification. Additionally, humidification increased the share of the bark in stem biomass and the number of branches per crown length. The acclimation of silver birches to increased air humidity entails changes in forest N cycle and in birch timber quality.
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Affiliation(s)
- K Rosenvald
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005, Tartu, Estonia.
| | - K Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005, Tartu, Estonia
| | - G Rohula-Okunev
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005, Tartu, Estonia
| | - R Lutter
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, 51006, Tartu, Estonia.,Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Skogsmarksgränd 17, 90183, Umeå, Sweden
| | - P Kupper
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005, Tartu, Estonia
| | - A Tullus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005, Tartu, Estonia
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Lõhmus K, Rosenvald K, Ostonen I, Kukumägi M, Uri V, Tullus A, Aosaar J, Varik M, Kupper P, Torga R, Maddison M, Soosaar K, Sõber J, Mander Ü, Kaasik A, Sõber A. Elevated atmospheric humidity shapes the carbon cycle of a silver birch forest ecosystem: A FAHM study. Sci Total Environ 2019; 661:441-448. [PMID: 30677689 DOI: 10.1016/j.scitotenv.2019.01.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/07/2019] [Accepted: 01/13/2019] [Indexed: 06/09/2023]
Abstract
Processes determining the carbon (C) balance of a forest ecosystem are influenced by a number of climatic and environmental factors. In Northern Europe, a rise in atmospheric humidity and precipitation is predicted. The study aims to ascertain the effect of elevated atmospheric humidity on the components of the C budget and on the C-sequestration capacity of a young birch forest. Biomass production, soil respiration, and other C fluxes were measured in young silver birch (Betula pendula Roth) stands growing on the Free Air Humidity Manipulation (FAHM) experimental site, located in South-East Estonia. The C input fluxes: C sequestration in trees and understory, litter input into soil, and methane oxidation, as well as C output fluxes: soil heterotrophic respiration and C leaching were estimated. Humidified birch stands stored C from the atmosphere, but control stands can be considered as C neutral. Two years of elevated air humidity increased C sequestration in the understory but decreased it in trees. Humidification treatment increased remarkably the C input to the soil. The main reason for such an increase was the higher root litter input into the soil, brought about by the more than two-fold increase of belowground biomass production of the understory in the humidification treatment. Elevated atmospheric humidity increased C sequestration in young silver birch stands, mitigating increasing CO2 concentration in the atmosphere. However, the effect of elevated atmospheric humidity is expected to decrease over time, as plants and soil organisms acclimate, and new communities emerge.
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Affiliation(s)
- K Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - K Rosenvald
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia.
| | - I Ostonen
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - M Kukumägi
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - V Uri
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51014, Estonia
| | - A Tullus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - J Aosaar
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51014, Estonia
| | - M Varik
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51014, Estonia
| | - P Kupper
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - R Torga
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - M Maddison
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - K Soosaar
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - J Sõber
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - Ü Mander
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - A Kaasik
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
| | - A Sõber
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu 51005, Estonia
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Ostonen I, Truu M, Helmisaari HS, Lukac M, Borken W, Vanguelova E, Godbold DL, Lõhmus K, Zang U, Tedersoo L, Preem JK, Rosenvald K, Aosaar J, Armolaitis K, Frey J, Kabral N, Kukumägi M, Leppälammi-Kujansuu J, Lindroos AJ, Merilä P, Napa Ü, Nöjd P, Parts K, Uri V, Varik M, Truu J. Adaptive root foraging strategies along a boreal-temperate forest gradient. New Phytol 2017; 215:977-991. [PMID: 28586137 DOI: 10.1111/nph.14643] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 04/30/2017] [Indexed: 05/05/2023]
Abstract
The tree root-mycorhizosphere plays a key role in resource uptake, but also in the adaptation of forests to changing environments. The adaptive foraging mechanisms of ectomycorrhizal (EcM) and fine roots of Picea abies, Pinus sylvestris and Betula pendula were evaluated along a gradient from temperate to subarctic boreal forest (38 sites between latitudes 48°N and 69°N) in Europe. Variables describing tree resource uptake structures and processes (absorptive fine root biomass and morphology, nitrogen (N) concentration in absorptive roots, extramatrical mycelium (EMM) biomass, community structure of root-associated EcM fungi, soil and rhizosphere bacteria) were used to analyse relationships between root system functional traits and climate, soil and stand characteristics. Absorptive fine root biomass per stand basal area increased significantly from temperate to boreal forests, coinciding with longer and thinner root tips with higher tissue density, smaller EMM biomass per root length and a shift in soil microbial community structure. The soil carbon (C) : N ratio was found to explain most of the variability in absorptive fine root and EMM biomass, root tissue density, N concentration and rhizosphere bacterial community structure. We suggest a concept of absorptive fine root foraging strategies involving both qualitative and quantitative changes in the root-mycorrhiza-bacteria continuum along climate and soil C : N gradients.
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Affiliation(s)
- Ivika Ostonen
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Marika Truu
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | | | - Martin Lukac
- School of Agriculture, Policy and Development, University of Reading, Reading, RG6 6AR, UK
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Prague, 165 00, Czech Republic
| | - Werner Borken
- Soil Ecology, University of Bayreuth, Dr.-Hans-Frisch-Straße 1-3, D 95448, Bayreuth, Germany
| | - Elena Vanguelova
- Centre for Ecosystem, Society and Biosecurity Forest Research, Farnham, GU10 4LH, UK
| | - Douglas L Godbold
- Institute of Forest Ecology, University of Natural Resources and Life Sciences, BOKU, 1190, Vienna, Austria
- Global Change Research Institute, Ceské Budejovice, 370 05, Czech Republic
| | - Krista Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Ulrich Zang
- Soil Ecology, University of Bayreuth, Dr.-Hans-Frisch-Straße 1-3, D 95448, Bayreuth, Germany
| | - Leho Tedersoo
- Natural History Museum and Botanical Garden, University of Tartu, 14a Ravila, Tartu, 50411, Estonia
| | - Jens-Konrad Preem
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Katrin Rosenvald
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Jürgen Aosaar
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, 51014, Estonia
| | - Kęstutis Armolaitis
- Institute of Forestry, Lithuanian Research Centre for Agriculture and Forestry, Liepų str. 1, Kaunas District, LT-53101, Girionys, Lithuania
| | - Jane Frey
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Naima Kabral
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Mai Kukumägi
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | | | - Antti-Jussi Lindroos
- Natural Resources Institute Finland (Luke), Oulu, 90570, Finland
- Natural Resources Institute Finland (Luke), Helsinki, 00790, Finland
| | - Päivi Merilä
- Natural Resources Institute Finland (Luke), Oulu, 90570, Finland
- Natural Resources Institute Finland (Luke), Helsinki, 00790, Finland
| | - Ülle Napa
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Pekka Nöjd
- Natural Resources Institute Finland (Luke), Luke c/o Aalto yliopisto, PL 16200, 00076, Aalto, Finland
| | - Kaarin Parts
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
| | - Veiko Uri
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, 51014, Estonia
| | - Mats Varik
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, 51014, Estonia
| | - Jaak Truu
- Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise, Tartu, 51014, Estonia
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Tullus A, Kupper P, Kaasik A, Tullus H, Lõhmus K, Sõber A, Sellin A. The competitive status of trees determines their responsiveness to increasing atmospheric humidity - a climate trend predicted for northern latitudes. Glob Chang Biol 2017; 23:1961-1974. [PMID: 27779805 DOI: 10.1111/gcb.13540] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 10/07/2016] [Accepted: 10/14/2016] [Indexed: 06/06/2023]
Abstract
The interactive effects of climate variables and tree-tree competition are still insufficiently understood drivers of forest response to global climate change. Precipitation and air humidity are predicted to rise concurrently at high latitudes of the Northern Hemisphere. We investigated whether the growth response of deciduous trees to elevated air humidity varies with their competitive status. The study was conducted in seed-originated silver birch and monoclonal hybrid aspen stands grown at the free air humidity manipulation (FAHM) experimental site in Estonia, in which manipulated stands (n = 3 for both species) are exposed to artificially elevated relative air humidity (6-7% over the ambient level). The study period included three growing seasons during which the stands had reached the competitive stage (trees were 7 years old in the final year). A significant 'treatment×competitive status' interactive effect on growth was detected in all years in birch (P < 0.01) and in one year in aspen stands (P = 0.015). Competitively advantaged trees were always more strongly affected by elevated humidity. Initially the growth of advantaged and neutral trees of both species remained significantly suppressed in humidified stands. In the following years, dominance and elevated humidity had a synergistic positive effect on the growth of birches. Aspens with different competitive status recovered more uniformly, attaining similar relative growth rates in manipulated and control stands, but preserved a significantly lower total growth yield due to severe initial growth stress. Disadvantaged trees of both species were never significantly affected by elevated humidity. Our results suggest that air humidity affects trees indirectly depending on their social status. Therefore, the response of northern temperate and boreal forests to a more humid climate in future will likely be modified by competitive relationships among trees, which may potentially affect species composition and cause a need to change forestry practices.
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Affiliation(s)
- Arvo Tullus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
| | - Priit Kupper
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
| | - Ants Kaasik
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
| | - Hardi Tullus
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, 51014, Estonia
| | - Krista Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
| | - Anu Sõber
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
| | - Arne Sellin
- Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia
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Truu M, Ostonen I, Preem JK, Lõhmus K, Nõlvak H, Ligi T, Rosenvald K, Parts K, Kupper P, Truu J. Elevated Air Humidity Changes Soil Bacterial Community Structure in the Silver Birch Stand. Front Microbiol 2017; 8:557. [PMID: 28421053 PMCID: PMC5376589 DOI: 10.3389/fmicb.2017.00557] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 03/16/2017] [Indexed: 01/05/2023] Open
Abstract
Soil microbes play a fundamental role in forest ecosystems and respond rapidly to changes in the environment. Simultaneously with the temperature increase the climate change scenarios also predict an intensified hydrological cycle for the Baltic Sea runoff region. The aim of this study was to assess the effect of elevated air humidity on the top soil microbial community structure of a silver birch (Betula pendula Roth.) stand by using a free air humidity manipulation facility (FAHM). The bacterial community structures of bulk soil and birch rhizosphere were analyzed using high-throughput sequencing of bacteria-specific16S rRNA gene fragments and quantification of denitrification related genes. The increased air humidity altered both bulk soil and rhizosphere bacterial community structures, and changes in the bacterial communities initiated by elevated air humidity were related to modified soil abiotic and biotic variables. Network analysis revealed that variation in soil bacterial community structural units is explained by altered abiotic conditions such as increased pH value in bulk soil, while in rhizosphere the change in absorptive root morphology had a higher effect. Among root morphological traits, the absorptive root diameter was strongest related to the bacterial community structure. The changes in bacterial community structures under elevated air humidity are associated with shifts in C, N, and P turnover as well as mineral weathering processes in soil. Increased air humidity decreased the nir and nosZ gene abundance in the rhizosphere bacterial community. The potential contribution of the denitrification to the N2O emission was not affected by the elevated air humidity in birch stand soil. In addition, the study revealed a strong link between the bacterial community structure, abundance of denitrification related genes, and birch absorptive root morphology in the ecosystem system adaptation to elevated air humidity.
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Affiliation(s)
- Marika Truu
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Ivika Ostonen
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Jens-Konrad Preem
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Krista Lõhmus
- Department of Botany, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Hiie Nõlvak
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Teele Ligi
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Katrin Rosenvald
- Department of Botany, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Kaarin Parts
- Department of Botany, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Priit Kupper
- Department of Botany, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Jaak Truu
- Department of Geography, Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
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Sellin A, Rosenvald K, Õunapuu-Pikas E, Tullus A, Ostonen I, Lõhmus K. Elevated air humidity affects hydraulic traits and tree size but not biomass allocation in young silver birches (Betula pendula). Front Plant Sci 2015; 6:860. [PMID: 26528318 PMCID: PMC4602113 DOI: 10.3389/fpls.2015.00860] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 09/29/2015] [Indexed: 05/13/2023]
Abstract
As changes in air temperature, precipitation, and air humidity are expected in the coming decades, studies on the impact of these environmental shifts on plant growth and functioning are of major importance. Greatly understudied aspects of climate change include consequences of increasing air humidity on forest ecosystems, predicted for high latitudes. The main objective of this study was to find a link between hydraulic acclimation and shifts in trees' resource allocation in silver birch (Betula pendula Roth) in response to elevated air relative humidity (RH). A second question was whether the changes in hydraulic architecture depend on tree size. Two years of application of increased RH decreased the biomass accumulation in birch saplings, but the biomass partitioning among aboveground parts (leaves, branches, and stems) remained unaffected. Increased stem Huber values (xylem cross-sectional area to leaf area ratio) observed in trees under elevated RH did not entail changes in the ratio of non-photosynthetic to photosynthetic tissues. The reduction of stem-wood density is attributable to diminished mechanical load imposed on the stem, since humidified trees had relatively shorter crowns. Growing under higher RH caused hydraulic conductance of the root system (K R) to increase, while K R (expressed per unit leaf area) decreased and leaf hydraulic conductance increased with tree size. Saplings of silver birch acclimate to increasing air humidity by adjusting plant morphology (live crown length, slenderness, specific leaf area, and fine-root traits) and wood density rather than biomass distribution among aboveground organs. The treatment had a significant effect on several hydraulic properties of the trees, while the shifts were largely associated with changes in tree size but not in biomass allocation.
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Mander U, Well R, Weymann D, Soosaar K, Maddison M, Kanal A, Lõhmus K, Truu J, Augustin J, Tournebize J. Isotopologue ratios of N2O and N2 measurements underpin the importance of denitrification in differently N-loaded riparian alder forests. Environ Sci Technol 2014; 48:11910-11918. [PMID: 25264900 DOI: 10.1021/es501727h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Known as biogeochemical hotspots in landscapes, riparian buffer zones exhibit considerable potential concerning mitigation of groundwater contaminants such as nitrate, but may in return enhance the risk for indirect N2O emission. Here we aim to assess and to compare two riparian gray alder forests in terms of gaseous N2O and N2 fluxes and dissolved N2O, N2, and NO3(-) in the near-surface groundwater. We further determine for the first time isotopologue ratios of N2O dissolved in the riparian groundwater in order to support our assumption that it mainly originated from denitrification. The study sites, both situated in Estonia, northeastern Europe, receive contrasting N loads from adjacent uphill arable land. Whereas N2O emissions were rather small at both sites, average gaseous N2-to-N2O ratios inferred from closed-chamber measurements and He-O laboratory incubations were almost four times smaller for the heavily loaded site. In contrast, groundwater parameters were less variable among sites and between landscape positions. Campaign-based average (15)N site preferences of N2O (SP) in riparian groundwater ranged between 11 and 44 ‰. Besides the strong prevalence of N2 emission over N2O fluxes and the correlation pattern between isotopologue and water quality data, this comparatively large range highlights the importance of denitrification and N2O reduction in both riparian gray alder stands.
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Affiliation(s)
- Ulo Mander
- Institute of Ecology and Earth Sciences, University of Tartu , 51014 Tartu, Estonia
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Aan A, Lõhmus K, Sellin A, Kull O. Changes in light- and nitrogen-use and in aboveground biomass allocation patterns along productivity gradients in grasslands. J Plant Res 2014; 127:441-453. [PMID: 24676970 DOI: 10.1007/s10265-014-0629-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 02/04/2014] [Indexed: 06/03/2023]
Abstract
Light- and nitrogen-use change was examined along productivity gradients in natural grasslands at Laelatu, western Estonia, both at community level and in most abundant species. Aboveground biomass (M) ranged from 341 to 503 g m(-2) in wet (W) and from 248 to 682 g m(-2) in dry (D) community. Aboveground leaf area ratio (aLAR) decreased with rising M in D site, while it increased in W site. In a high-aLAR W community (significantly higher compared to D), adjustment of leaf morphology through an increase in specific leaf area is responsible for an increase in aLAR with rising productivity. In low-aLAR stand, by contrast, adjustment of biomass allocation due to decrease in aboveground leaf mass fraction is primarily responsible for the tendency of aLAR to decline. In conclusion, a decrease in aLAR is not a universal response to increasing M. We hypothesise that there exists an optimum of light acquisition efficiency (ΦM) along a productivity gradient independent of community type. Aboveground nitrogen-use efficiency (aNUE) decreased in high-aLAR, W community with increasing M, while in low-aLAR, D site, there was no relationship along a gradient, although aNUE increased along six plots dominated by graminoids. A trade-off was established between leaf nitrogen content per unit leaf area (N A) and aLAR.
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Affiliation(s)
- Anne Aan
- Institute of Ecology and Earth Sciences, University of Tartu, 40 Lai St., 51005, Tartu, Estonia,
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Ostonen I, Rosenvald K, Helmisaari HS, Godbold D, Parts K, Uri V, Lõhmus K. Morphological plasticity of ectomycorrhizal short roots in Betula sp and Picea abies forests across climate and forest succession gradients: its role in changing environments. Front Plant Sci 2013; 4:335. [PMID: 24032035 PMCID: PMC3759007 DOI: 10.3389/fpls.2013.00335] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 08/09/2013] [Indexed: 05/13/2023]
Abstract
Morphological plasticity of ectomycorrhizal (EcM) short roots (known also as first and second order roots with primary development) allows trees to adjust their water and nutrient uptake to local environmental conditions. The morphological traits (MTs) of short-living EcM roots, such as specific root length (SRL) and area, root tip frequency per mass unit (RTF), root tissue density, as well as mean diameter, length, and mass of the root tips, are good indicators of acclimation. We investigated the role of EcM root morphological plasticity across the climate gradient (48-68°N) in Norway spruce (Picea abies (L.) Karst) and (53-66°N) birch (Betula pendula Roth., B. pubescens Ehrh.) forests, as well as in primary and secondary successional birch forests assuming higher plasticity of a respective root trait to reflect higher relevance of that characteristic in acclimation process. We hypothesized that although the morphological plasticity of EcM roots is subject to the abiotic and biotic environmental conditions in the changing climate; the tools to achieve the appropriate morphological acclimation are tree species-specific. Long-term (1994-2010) measurements of EcM roots morphology strongly imply that tree species have different acclimation-indicative root traits in response to changing environments. Birch EcM roots acclimated along latitude by changing mostly SRL [plasticity index (PI) = 0.60], while spruce EcM roots became adjusted by modifying RTF (PI = 0.68). Silver birch as a pioneer species must have a broader tolerance to environmental conditions across various environments; however, the mean PI of all MTs did not differ between early-successional birch and late-successional spruce. The differences between species in SRL, and RTF, diameter, and length decreased southward, toward temperate forests with more favorable growth conditions. EcM root traits reflected root-rhizosphere succession across forest succession stages.
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Affiliation(s)
- Ivika Ostonen
- Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Katrin Rosenvald
- Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | | | | | - Kaarin Parts
- Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
| | - Veiko Uri
- Institute of Forestry and Rural Engineering, Estonian University of Life SciencesTartu, Estonia
| | - Krista Lõhmus
- Institute of Ecology and Earth Sciences, University of TartuTartu, Estonia
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Tullus A, Kupper P, Sellin A, Parts L, Sõber J, Tullus T, Lõhmus K, Sõber A, Tullus H. Climate change at northern latitudes: rising atmospheric humidity decreases transpiration, N-uptake and growth rate of hybrid aspen. PLoS One 2012; 7:e42648. [PMID: 22880067 PMCID: PMC3412825 DOI: 10.1371/journal.pone.0042648] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 07/11/2012] [Indexed: 12/03/2022] Open
Abstract
At northern latitudes a rise in atmospheric humidity and precipitation is predicted as a consequence of global climate change. We studied several growth and functional traits of hybrid aspen (Populus tremula L.×P. tremuloides Michx.) in response to elevated atmospheric humidity (on average 7% over the ambient level) in a free air experimental facility during three growing seasons (2008-2010) in Estonia, which represents northern temperate climate (boreo-nemoral zone). Data were collected from three humidified (H) and three control (C) plots, and analysed using nested linear models. Elevated air humidity significantly reduced height, stem diameter and stem volume increments and transpiration of the trees whereas these effects remained highly significant also after considering the side effects from soil-related confounders within the 2.7 ha study area. Tree leaves were smaller, lighter and had lower leaf mass per area (LMA) in H plots. The magnitude and significance of the humidity treatment effect--inhibition of above-ground growth rate--was more pronounced in larger trees. The lower growth rate in the humidified plots can be partly explained by a decrease in transpiration-driven mass flow of NO(3) (-) in soil, resulting in a significant reduction in the measured uptake of N to foliage in the H plots. The results suggest that the potential growth improvement of fast-growing trees like aspens, due to increasing temperature and atmospheric CO(2) concentration, might be smaller than expected at high latitudes if a rise in atmospheric humidity simultaneously takes place.
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Affiliation(s)
- Arvo Tullus
- Department of Silviculture, Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Priit Kupper
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Arne Sellin
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Leopold Parts
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario, Canada
| | - Jaak Sõber
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Tea Tullus
- Department of Silviculture, Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
| | - Krista Lõhmus
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Anu Sõber
- Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Hardi Tullus
- Department of Silviculture, Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
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Helmisaari HS, Ostonen I, Lõhmus K, Derome J, Lindroos AJ, Merilä P, Nöjd P. Ectomycorrhizal root tips in relation to site and stand characteristics in Norway spruce and Scots pine stands in boreal forests. Tree Physiol 2009; 29:445-56. [PMID: 19203968 DOI: 10.1093/treephys/tpn042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Variations in ectomycorrhizal (EcM) short root tips of Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) in 16 stands throughout Finland were studied, and their relationships with latitude, organic layer C:N ratio, temperature sum and foliage biomass were determined. There were no significant differences in EcM root tip frequency (number per milligram of fine roots) or root tip mass between tree species or between northern and southern sites. The EcM root tip number per unit area of the organic layer plus the 0-30 cm mineral soil layer varied between 0.8 and 2.4 million per m(2) for Norway spruce and between 0.7 and 2.9 million per m(2) for Scots pine, and it was higher in the northern Scots pine stands than in the southern Scots pine stands. Over 80% of the EcM root tips of both species were in the organic layer and the upper 0-10 cm mineral soil layer. We related EcM root tips to foliage mass because these two components are the most important functional units in boreal tree physiology. Both species, especially the Scots pine trees, had more EcM root tips in relation to foliage mass in northern Finland than in southern Finland. Scots pine trees had more EcM root tips in relation to foliage mass than Norway spruce in the same climatic region. The EcM root tip:foliage biomass ratio of Norway spruce was positively related to the C:N ratio in the organic layer, whereas that of Scots pine was negatively related to the temperature sum. The number of EcM root tips per milligram of fine root biomass was constant, implying that trees of both species increase nutrient uptake by increasing fine root production and hence their total number of EcM tips and the area of soil occupied by mycelia. Both tree species responded to nitrogen (N) deficiency by maintaining more EcM tips per foliage unit, and this may be related to a higher proportion of N uptake in an organic form.
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Affiliation(s)
- Heljä-Sisko Helmisaari
- Finnish Forest Research Institute, Vantaa Research Unit, P.O. Box 18, FI-01301 Vantaa, Finland.
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Mander U, Lõhmus K, Teiter S, Mauring T, Nurk K, Augustin J. Gaseous fluxes in the nitrogen and carbon budgets of subsurface flow constructed wetlands. Sci Total Environ 2008; 404:343-353. [PMID: 18486194 DOI: 10.1016/j.scitotenv.2008.03.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In 2001 and 2002, fluxes of N(2)O, CH(4), CO(2) and N(2) were measured in two constructed wetlands (CW) for domestic wastewater treatment in Estonia. The difference between the median values of N(2)O, CH(4), and N(2) fluxes in the horizontal subsurface flow (HSSF) CWs was non-significant, being 1.3-1.4 and 1.4-4.1 mg m(-2) d(-1) for N(2)O-N and CH(4)-C, and 0.16-0.17 g N m(-2) d(-1) for N(2)-N respectively. The CO(2)-C flux was significantly lower (0.6 g C m(-2) d(-1)) in one of the HSSF filters of a hybrid CW, whereas the single HSSF and VSSF filters emitted 1.7 and 2.0 g C m(-2) d(-1). The median value of CH(4)-C emission in CWs varied from 1.4 to 42.6 g C m(-2) d(-1), being significantly higher in the VSSF filter beds. We also estimated C and N budgets in one of the HSSF CWs (312.5 m(2)) for 2001 and 2002. The total C input into this system was similar in 2001 and 2002, 772 and 719 kg C year(-1), but was differently distributed between constituent fluxes. In 2001, the main input flux was soil and microbial accumulation (663 kg C year(-1) or 85.8% of total C input), followed by plant net primary production (NPP) (10.2%) and wastewater inflow (3.9%). In 2002, 55.7% of annual C input was bound in plant NPP, whereas the increase in soil C formed 28.5% and wastewater inflow 15.7%. The main C output flux was soil respiration, including microbial respiration from soil and litter, and the respiration of roots and rhizomes. It formed 120 (97.5%) and 230 kg C year(-1) (98.2%) in 2001 and 2002 respectively. The measured CH(4)-C flux remained below 0.1% of total C output. The HSSF CW was generally found to be a strong C sink, and its annual C sequestration was 649 and 484 kg C year(-1) per wetland in 2001 and 2002 respectively. However, negative soil and microbial accumulation values in recent years indicate decreasing C sequestration. The average annual N removal from the system was 38-59 kg N year(-1) (46-48% of the initial total N loading). The most important flux of the N budget was N(2)-N emission (22.7 kg in 2001 and 15.2 kg in 2002), followed by plant belowground assimilation (2.3 and 11.9 kg N year(-1) in 2001 and 2002), and above-ground assimilation (1.9 and 9.2 kg N year(-1), respectively). N(2)O emission was low: 0.37-0.60 kg N year(-1)(.).
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Affiliation(s)
- Ulo Mander
- Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu, Estonia.
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Ostonen I, Lõhmus K, Helmisaari HS, Truu J, Meel S. Fine root morphological adaptations in Scots pine, Norway spruce and silver birch along a latitudinal gradient in boreal forests. Tree Physiol 2007; 27:1627-34. [PMID: 17669752 DOI: 10.1093/treephys/27.11.1627] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Variability in short root morphology of the three main tree species of Europe's boreal forest (Norway spruce (Picea abies L. Karst.), Scots pine (Pinus sylvestris L.) and silver birch (Betula pendula Roth)) was investigated in four stands along a latitudinal gradient from northern Finland to southern Estonia. Silver birch and Scots pine were present in three stands and Norway spruce was present in all stands. For three fertile Norway spruce stands, fine root biomass and number of root tips per stand area or unit basal area were assessed from north to south. Principal component analysis indicated that short root morphology was significantly affected by tree species and site, which together explained 34.7% of the total variability. The range of variation in mean specific root area (SRA) was 51-74, 60-70 and 84-124 m(2) kg(-1) for Norway spruce, Scots pine and silver birch, respectively, and the corresponding ranges for specific root length were 37-47, 40-48 and 87-97 m g(-1). The range of variation in root tissue density of Norway spruce, Scots pine and silver birch was 113-182, 127-158 and 81-156 kg m(-3), respectively. Sensitivity of short root morphology to site conditions decreased in the order: Norway spruce > silver birch > Scots pine. Short root SRA increased with site fertility in all species. In Norway spruce, fine root biomass and number of root tips per m(2) decreased from north to south. The differences in morphological parameters among sites were significant but smaller than the site differences in fine root biomass and number of root tips.
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Affiliation(s)
- Ivika Ostonen
- Institute of Geography, University of Tartu, Vanemuise 46, Estonia.
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Ostonen I, Püttsepp Ü, Biel C, Alberton O, Bakker MR, Lõhmus K, Majdi H, Metcalfe D, Olsthoorn AFM, Pronk A, Vanguelova E, Weih M, Brunner I. Specific root length as an indicator of environmental change. Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology 2007. [PMID: 0 DOI: 10.1080/11263500701626069] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
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Lõhmus K, Truu J, Truu M, Kaar E, Ostonen I, Alama S, Kuznetsova T, Rosenvald K, Vares A, Uri V, Mander Ü. Black alder as a promising deciduous species for the reclaiming of oil shale mining areas. ACTA ACUST UNITED AC 2006. [DOI: 10.2495/bf060091] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Maddison M, Soosaar K, Lõhmus K, Mander U. Cattail population in wastewater treatment wetlands in Estonia: biomass production, retention of nutrients, and heavy metals in phytomass. J Environ Sci Health A Tox Hazard Subst Environ Eng 2005; 40:1157-66. [PMID: 15921272 DOI: 10.1081/ese-200055624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The aim of this article is to evaluate and compare common cattail (Typha latifolia) biomass production and annual accumulation of nitrogen, phosphorus, carbon, and heavy metals (Cd, Cu, Pb, Zn) in phytomass in 3 treatment wetland systems in Estonia. The biomass samples (roots/rhizomes, shoots with leaves, and spadixes) and litter were collected from 1 x 1 m plots--15 plots in Tänassilma seminatural wetland, 15 plots in Põltsamaa constructed wetland, and 10 plots in Häädemeeste constructed wetland. The highest average total cattail phytomass was 2.54 kg DW m(-2) in Häädemeeste. In Tänassilma and Põltsamaa this value was 2.3 and 2.11 kg DW m(-2), respectively. The average total aboveground biomass production and roots/rhizomes phytomass was not significantly different in three studied wetland systems. We have found significantly less spadixes and litter in Tänassilma than in Põltsamaa and Häädemeeste. In Põltsamaa, the N and P content in all plant fractions were higher than in other test areas. The Cd concentration in all samples (shoots, spadixes, litter) varied from < 0.01 to < 0.02 mg/kg. The average concentration of Zn in litter varied from 12.2 mg kg(-1) in Häädemeeste to 12.6 mg kg(-1) in Tänassilma and 13.3 mg kg(-1) in Põltsamaa. There has been found a significantly higher average contents of Cu (39.3 mg kg(-1)), Pb (30.4 mg kg(-1)), and Zn (412.3 mg kg(-1)) in Tänassilma than those in Häädemeeste or Põltsamaa: Cu-11.6 and 15.9, Pb--2.3 and 3.3, and Zn--57.5 and 73.2 mg kg(-1), respectively. The highest heavy metal retention (303.2 mg Pb m(-2), 29.4 mg Zn m(-)2, 22.9 mg Cu m(-2), and 0.35 mg Cd m(-2)) was observed in root and rhizome samples from the Tänassilma wetland.
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Mander U, Lõhmus K, Teiter S, Nurk K, Mauring T, Augustin J. Gaseous fluxes from subsurface flow constructed wetlands for wastewater treatment. J Environ Sci Health A Tox Hazard Subst Environ Eng 2005; 40:1215-26. [PMID: 15921277 DOI: 10.1081/ese-200055662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We measured nitrous oxide (N2O), dinitrogen (N2), and methane (CH4) fluxes in two constructed wetlands (CW) in Estonia using the closed chamber method and the He-O method in the period from October 2000 to March 2003. Emission rates of N2O-N, N2-N and CH4-C from both CWs varied significantly on a both spatial and temporal scale, ranging from 1 to 2,600, 170 to 130,000, and -1.7 to 87,200 microg m(-2) h(-1) respectively. The average flux of N2O from the microsites in the Kodijärve horizontal subsurface flow (HSSF) CW and Kõo hybrid CW ranged from 27 to 370 and from 72 to 500 microg N2O-N m(-2) h(-1), respectively, whereas the average dinitrogen flux from the microsites in the HSSF CW in Kodijärve was 2-3 magnitudes higher than the N2O flux, ranging from 19,500 to 33,300 microg N2-N m(-2) h(-1). The average methane emissions from the microsites in the Kodijärve HSSF CW and the Kõo hybrid CW ranged from 31 to 12,100 and from 950 to 5,750 microg CH4-C m(-2) h(-1), respectively. The highest emission values for all three gases were observed in the warm period. There was a significant relationship between emission rates and water table depth: CH4 and N2 emission increased and N2O emission decreased when the water table did rise. Although the emission of N2O and CH4 from CWs was found to be relatively high, their global warming potential (GWP) in the time horizon of 100 years is not significant, ranging from 4.5 to 16.3 tonnes of CO2 equivalents per ha per year in Kodijärve and from 12.1 to 17.3 t CO2 equivalents ha(-1) yr(-1) in Kõo.
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Affiliation(s)
- Ulo Mander
- Institute of Geography, University of Tartu, Tartu, Estonia.
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Kuusemets V, Lõhmus K. Nitrogen and phosphorus accumulation and biomass production by Scirpus sylvaticus and Phragmites australis in a horizontal subsurface flow constructed wetland. J Environ Sci Health A Tox Hazard Subst Environ Eng 2005; 40:1167-75. [PMID: 15921273 DOI: 10.1081/ese-200055629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We studied plant biomass production and nutrient accumulation by wood club-rush (Scirpus sylvaticus) and reed (Phragmites australis) in a horizontal subsurface flow constructed wetland in 2001 and 2002. The wetland consists of two beds, one with dry and another with wetter conditions. From both beds, 5 above-ground, below-ground, and litter samples were taken in the summer, during the maximum flowering period of the dominant species. The average dry biomass of whole plant and litter was considerable higher in 2002 (3071 g m(-2)) than in 2001 (620 g m(-2)) due to the climatic conditions. The average dry weight biomass of 5 plots in 2001 was 513 g m(-2) in the dry bed and 729 g m(-2) in the wet bed. In 2002 these values were 2,520 and 3,765, respectively. Variations in biomasses will also appear in values for nutrient accumulation, in all cases the N and P accumulation was higher in 2002. The average nitrogen accumulation by plants was 16.6 g m(-2) in the wet and 10.7 g m(-2) in the dry bed in 2001, and 51.7 and 83.5 g m(-2) in 2002 respectively. Phosphorus accumulation was higher in the wet bed during 2001--2.8 g m(-2), in the dry bed this value was 1.9 g m(-2). In 2002, the phosphorus accumulation was higher in the dry bed--12.8 g m(-2), in the wet bed it was 12.43 g m(-2). The total biomass at the same conditions in the wet bed was slightly higher in case of wood club-rush--765 g m(-2) in 2001 and 3846 g m(-2) in 2002, same values for reed were 674 g m(-2) and 3,646, respectively.
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Affiliation(s)
- Valdo Kuusemets
- Institute of Geography, University of Tartu, Tartu, Estonia.
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Mander U, Kuusemets V, Lõhmus K, Mauring T, Teiter S, Augustin J. Nitrous oxide, dinitrogen and methane emission in a subsurface flow constructed wetland. Water Sci Technol 2003; 48:135-142. [PMID: 14621157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
N2O, N2 and CH4 fluxes were measured from a horizontal subsurface flow (HSSF) constructed wetland (CW) for wastewater treatment in Estonia. The closed chamber method was used in the field and the He-O method (intact soil core analyses) in the lab throughout the period from October 2001 to June 2002. The average flux of N2O-N, N2-N and CH4-C from various microsites ranged from 0.1 to 59, 4.1 to 1,458 and -0.04 to 2,094 mg m(-2) d(-1), respectively. A significantly higher flux of N2O was found in chambers installed above the inlet pipes, while the methane flux was higher in the inlet part of the bed with wetter conditions. The groundwater table significantly correlates with gas emission rates of all the gases studied; N2 emission was enhanced by higher temperature of wastewater. PO4(3-) and NH4+ content significantly enhanced, and NO2- and NO3- content inhibited, both N2O and CH4 fluxes. NH4+ showed a negative correlation with N2 flux. Nitrification and denitrification are the main processes of the N removal in the CW covering 42.9%. The specific global warming potential was highest in the wet bed and lowest in the dry bed with lowered water table (32 and 9 g CO2 pe(-1) d(-1), respectively).
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Affiliation(s)
- U Mander
- Institute of Geography, University of Tartu, 46 Vanemuise St, 51014 Tartu, Estonia.
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Kuusemets V, Mander U, Lõhmus K, Ivask M. Nitrogen and phosphorus variation in shallow groundwater and assimilation in plants in complex riparian buffer zones. Water Sci Technol 2001; 44:615-622. [PMID: 11804159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The study of purification efficiency and nutrient assimilation in plants was made in two riparian buffer zones with a complex of wet meadow and grey alder (Alnus incana) stand. In the less polluted Porijõgi test site, the 31 m wide buffer zone removed 40% of total nitrogen (total-N) and 78% of total phosphorus (total-P), while a heavily polluted 51 m wide buffer zone in Viiratsi retained 85% of total-N and 84% of total-P. The input of nutrients and purification efficiency displayed a significant relationship. The total-N removal in buffer zone was negative when the input value was less than 0.3 mg l(-1) and the purification efficiency was always positive when the input value exceeded 5 mg l(-1). The purification efficiency of total-P was positive when the input value exceeded 0.15 mg l(-1). Grass vegetation plays an important role in nutrient retention in riparian buffer strips. The maximum phytomass production was measured in Porijõgi site where production of the Filipendula ulmaria community was up to 2,358 g m(-2), assimilation of N 32.1 and of P 4.9 g m(-2), respectively. This is much higher than the biomass production and N and P uptake of the grey alders (Alnus incana) at the same site--1,730, 20.5 and 1.5 g m(-2), respectively.
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Affiliation(s)
- V Kuusemets
- Institute of Geography, University of Tartu, Estonia
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