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Zhang S, Xiao Z, Zhang H, Aurangzeib M. Key factors determining soil organic carbon changes after freeze-thaw cycles in a watershed located in northeast China. Sci Total Environ 2022; 828:154525. [PMID: 35288134 DOI: 10.1016/j.scitotenv.2022.154525] [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: 08/28/2021] [Revised: 02/28/2022] [Accepted: 03/08/2022] [Indexed: 06/14/2023]
Abstract
The transformation and migration process of soil organic carbon (SOC) could be changed during freeze-thaw cycles (FTCs) and may further affect the SOC distribution in the watershed. In this study, both field investigation and lab incubation combined with geostatistics were used to clarify how environmental factors influence the SOC heterogeneity in Mollisol after FTCs, from a watershed in northeast China. The results showed that after FTCs, SOC decreased in 68.5% of the total watershed area at 0-20 cm soil depth, and the mean value decreased by 7.4%. Spatial autocorrelation (Moran's І) decreased in the 0-5 cm and 10-20 cm soil depths after FTCs (P < 0.01), but did not change in 5-10 cm and 0-20 cm soil depths. SOC increased at the top slope positions, the watershed outlet, and the upper slope position of the intersection area between farmland and forestland. The SOC decrease was 25 times and 14 times greater at the 0-5 cm and 0-20 cm soil depths respectively in the forestland than in the farmland. The SOC decrease was significantly higher on the 6-8° slopes than on the 0-2° slopes in 0-20 cm soil depth. SOC increased in most areas of cross-slope tillage (CST), but decreased in most areas of downslope tillage. The increase of SOC (positive change) decreased with increasing soil depth under soybeans field, while the decrease of SOC (negative change) increased with increasing soil depth under corn. Topographical factors alone, and topographical factors combined with land use types all influenced the SOC change in this watershed. High levels of ferrous minerals tended to reduce the rate of SOC after FTCs. SOC change is positively correlated to soil bulk density, FTC frequency and soil moisture after FTCs at the soil depth of 0-30 cm. Equations based on soil properties before FTCs, topographical factors, sediment transport index, runoff intensity index, and tillage method can be used for coarsely predicting SOC distribution after FTCs (45% < R2 < 78%, P < 0.01). Generally, SOC dynamics were mainly determined by topography, land use, and to tillage methods that possibly attributes to soil and water loss during FTCs. Both erosion caused by snowmelt runoff and vertical migration of SOC could be the key factors that changed the SOC spatial pattern. CST was beneficial to conserve SOC during FTCs, while forestland could reduce SOC loss by reducing snowmelt erosion.
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Affiliation(s)
- Shaoliang Zhang
- Northeast Agricultural University, 600 Changjiang Rd, Harbin 150030, PR China.
| | - Ziliang Xiao
- Northeast Agricultural University, 600 Changjiang Rd, Harbin 150030, PR China
| | - Haijun Zhang
- Northeast Agricultural University, 600 Changjiang Rd, Harbin 150030, PR China
| | - Muhammad Aurangzeib
- Northeast Agricultural University, 600 Changjiang Rd, Harbin 150030, PR China
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Misiak M, Goodall‐Copestake WP, Sparks TH, Worland MR, Boddy L, Magan N, Convey P, Hopkins DW, Newsham KK. Inhibitory effects of climate change on the growth and extracellular enzyme activities of a widespread Antarctic soil fungus. Glob Chang Biol 2020; 27:1111-1125. [PMID: 33230837 PMCID: PMC7898924 DOI: 10.1111/gcb.15456] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 10/22/2020] [Accepted: 11/14/2020] [Indexed: 06/01/2023]
Abstract
Temperatures approaching or exceeding 20°C have been measured during summer in polar regions at the surfaces of barren fellfield soils under cloudless skies around solar noon. However, despite the upper temperature limit for the growth of cold-adapted microbes-which are abundant in polar soils and have pivotal roles in nutrient cycling-typically being close to this temperature, previous studies have not addressed the consequences of climate change for the metabolism of these organisms in the natural environment. Here in a 5-year field experiment on Alexander Island in the southern maritime Antarctic, we show that the abundance of Pseudogymnoascus roseus, the most widespread decomposer fungus in maritime Antarctic fellfield soils, is reduced by 1-2 orders of magnitude when irrigated and nutrient-amended soils are warmed to >20°C during summer. Laboratory experiments under conditions mimicking those during midsummer in the natural environment indicated that the hyphal extension rates of P. roseus isolates and the activities of five extracellular enzymes are reduced by 54%-96% at high water availability after exposure to temperatures cycling daily from 2 to 21°C and 2 to 24°C, relative to temperatures cycling from 2 to 18°C. Given that the temperatures of surface soils at the study site already reach 19°C during midsummer, the observations reported here suggest that, at predicted rates of warming arising from moderate greenhouse gas emissions, inhibitory effects of climate change on the metabolism of P. roseus could manifest themselves within the next few decades. Furthermore, with peak temperatures at the surfaces of fellfield soils at other maritime Antarctic locations and in High Arctic and alpine regions already exceeding 20°C during summer, the observations suggest that climate warming has the potential to inhibit the growth of other cold-adapted microbes, with negative effects on soils as the Earth's climate continues to warm.
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Affiliation(s)
- Marta Misiak
- British Antarctic SurveyNERCCambridgeUK
- Cardiff School of BiosciencesCardiffUK
| | - William P. Goodall‐Copestake
- British Antarctic SurveyNERCCambridgeUK
- Present address:
Scottish Association for Marine ScienceObanArgyllPA37 1QAUK
| | - Tim H. Sparks
- Institute of ZoologyPoznań University of Life SciencesPoznańPoland
- Museum of ZoologyUniversity of CambridgeCambridgeUK
| | | | | | - Naresh Magan
- Applied Mycology Group, Environment and AgriFood ThemeCranfield UniversityCranfieldUK
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Ladd MP, Giannone RJ, Abraham PE, Wullschleger SD, Hettich RL. Evaluation of an untargeted nano-liquid chromatography-mass spectrometry approach to expand coverage of low molecular weight dissolved organic matter in Arctic soil. Sci Rep 2019; 9:5810. [PMID: 30967565 PMCID: PMC6456581 DOI: 10.1038/s41598-019-42118-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 03/14/2019] [Indexed: 11/17/2022] Open
Abstract
Characterizing low molecular weight (LMW) dissolved organic matter (DOM) in soils and evaluating the availability of this labile pool is critical to understanding the underlying mechanisms that control carbon storage or release across terrestrial systems. However, due to wide-ranging physicochemical diversity, characterizing this complex mixture of small molecules and how it varies across space remains an analytical challenge. Here, we evaluate an untargeted approach to detect qualitative and relative-quantitative variations in LMW DOM with depth using water extracts from a soil core from the Alaskan Arctic, a unique system that contains nearly half the Earth's terrestrial carbon and is rapidly warming due to climate change. We combined reversed-phase and hydrophilic interaction liquid chromatography, and nano-electrospray ionization coupled with high-resolution tandem mass spectrometry in positive- and negative-ionization mode. The optimized conditions were sensitive, robust, highly complementary, and enabled detection and putative annotations of a wide range of compounds (e.g. amino acids, plant/microbial metabolites, sugars, lipids, peptides). Furthermore, multivariate statistical analyses revealed subtle but consistent and significant variations with depth. Thus, this platform is useful not only for characterizing LMW DOM, but also for quantifying relative variations in LMW DOM availability across space, revealing hotspots of biogeochemical activity for further evaluation.
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Affiliation(s)
- Mallory P Ladd
- Bredesen Center for Interdisciplinary Research & Graduate Education, University of Tennessee, Knoxville, TN, 37996, USA
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Richard J Giannone
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Paul E Abraham
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Stan D Wullschleger
- Bredesen Center for Interdisciplinary Research & Graduate Education, University of Tennessee, Knoxville, TN, 37996, USA
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Robert L Hettich
- Bredesen Center for Interdisciplinary Research & Graduate Education, University of Tennessee, Knoxville, TN, 37996, USA.
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA.
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Chen X, Gao M, Li Y, Zhang X, Zhang F, Hu B. Effects of freeze-thaw cycles on the physicochemical characteristics of animal manure and its phosphorus forms. Waste Manag 2019; 88:160-169. [PMID: 31079628 DOI: 10.1016/j.wasman.2019.03.039] [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: 10/24/2018] [Revised: 03/14/2019] [Accepted: 03/19/2019] [Indexed: 06/09/2023]
Abstract
The variations of phosphorus (P) in animal manure during freeze-thaw cycles (FTCs) profoundly influence on non-point source P loss in winter. Therefore, understanding how FTCs influence the physicochemical properties of animal manure and its P availability is crucial. In this study, the freeze-thaw treatment was performed by incubating the pig manure at -20 °C for 12 h and at 18 °C for 12 h. The freeze-only treatment was maintained at -20 °C as a control. In addition, the pig manure was kept at two moisture levels during the FTCs and sampled every five cycles. Six forms of P in the manure were extracted and analyzed. After 30 cycles, the dissolved organic carbon had increased from 10.49 to 13.56 g/kg, and the pH had decreased from 6.25 to 5.77. The particles originally >1000 μm were broken into particles <250 μm. The forms of P in manure shifted from Ca-P, occluded P, and residual P towards NH4Cl-P, Al-P and Fe-P, resulting in a 23% increase in bioavailable P. These variations were highly coincident with the increase in moisture content and FTC frequency. The proportion of particles <38 μm increased by more than 2% after the FTCs, and the manure P was mainly concentrated in these particles, which might be readily washed away by the melt water. Overall, the study indicated that FTCs could enhance the bioavailability of P in pig manure and the mobility of particle-associated P. These findings are significant for reducing animal manure pollution in freeze-thaw season.
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Affiliation(s)
- Xingcai Chen
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875 Beijing, China
| | - Min Gao
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875 Beijing, China
| | - Yanxia Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875 Beijing, China.
| | - Xuelian Zhang
- Beijing Soil and Fertilizer Extension Service Station, Beijing 100029, China
| | - Fengsong Zhang
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101 Beijing, China
| | - Baiyang Hu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875 Beijing, China
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Morgalev YN, Lushchaeva IV, Morgaleva TG, Kolesnichenko LG, Loiko SV, Krickov IV, Lim A, Raudina TV, Volkova II, Shirokova LS, Morgalev SY, Vorobyev SN, Kirpotin SN, Pokrovsky OS. Bacteria primarily metabolize at the active layer/permafrost border in the peat core from a permafrost region in western Siberia. Polar Biol 2017. [DOI: 10.1007/s00300-017-2088-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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