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Haddad L, Vincent AG, Giesler R, Schleucher J. Small molecules dominate organic phosphorus in NaOH-EDTA extracts of soils as determined by 31P NMR. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 931:172496. [PMID: 38636859 DOI: 10.1016/j.scitotenv.2024.172496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 04/11/2024] [Accepted: 04/13/2024] [Indexed: 04/20/2024]
Abstract
Understanding the composition of organic phosphorus (P) in soils is relevant to various disciplines, from agricultural sciences to ecology. Despite past efforts, the precise nature of soil organic P remains an enigma, especially that of the orthophosphate monoesters, which dominate 31P NMR spectra of NaOH-EDTA extracts of soils worldwide. The monoester region often exhibits an unidentified, broad background believed to represent high molecular weight (MW) P. We investigated this monoester background using 1D 31P NMR and 2D 1H31P NMR, as well as 31P transverse relaxation (T2) measurements to calculate its intrinsic linewidth and relate it to MW. Analyzing seven soils from different ecosystems, we observed linewidths of 0.5 to 3 Hz for resolved monoester signals and the background, indicating that it consists of many, possibly >100, sharp signals associated with small (<1.5 kDa) organic P molecules. This result was further supported by 2D 1H31P NMR spectra revealing signals not resolved in the 1D spectra. Our findings align with 31P NMR studies detecting background signals in soil-free samples and modern evidence that alkali-soluble soil organic matter consists of self-assemblies of small organic compounds mimicking large molecules.
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Affiliation(s)
- Lenny Haddad
- Department of Medical Biochemistry and Biophysics, Umeå University, 90817 Umeå, Sweden.
| | - Andrea G Vincent
- Escuela de Biología, Universidad de Costa Rica, San José 2060, Costa Rica
| | - Reiner Giesler
- Department of Ecology and Environmental Sciences, Climate Impacts Research Centre, Umeå University, Umeå, Sweden
| | - Jürgen Schleucher
- Department of Medical Biochemistry and Biophysics, Umeå University, 90817 Umeå, Sweden
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Mahmood S, Fahad Z, Bolou-Bi EB, King K, Köhler SJ, Bishop K, Ekblad A, Finlay RD. Ectomycorrhizal fungi integrate nitrogen mobilisation and mineral weathering in boreal forest soil. THE NEW PHYTOLOGIST 2024; 242:1545-1560. [PMID: 37697631 DOI: 10.1111/nph.19260] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 08/24/2023] [Indexed: 09/13/2023]
Abstract
Tree growth in boreal forests is driven by ectomycorrhizal fungal mobilisation of organic nitrogen and mineral nutrients in soils with discrete organic and mineral horizons. However, there are no studies of how ectomycorrhizal mineral weathering and organic nitrogen mobilisation processes are integrated across the soil profile. We studied effects of organic matter (OM) availability on ectomycorrhizal functioning by altering the proportions of natural organic and mineral soil in reconstructed podzol profiles containing Pinus sylvestris plants, using 13CO2 pulse labelling, patterns of naturally occurring stable isotopes (26Mg and 15N) and high-throughput DNA sequencing of fungal amplicons. Reduction in OM resulted in nitrogen limitation of plant growth and decreased allocation of photosynthetically derived carbon and mycelial growth in mineral horizons. Fractionation patterns of 26Mg indicated that magnesium mobilisation and uptake occurred primarily in the deeper mineral horizon and was driven by carbon allocation to ectomycorrhizal mycelium. In this horizon, relative abundance of ectomycorrhizal fungi, carbon allocation and base cation mobilisation all increased with increased OM availability. Allocation of carbon through ectomycorrhizal fungi integrates organic nitrogen mobilisation and mineral weathering across soil horizons, improving the efficiency of plant nutrient acquisition. Our findings have fundamental implications for sustainable forest management and belowground carbon sequestration.
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Affiliation(s)
- Shahid Mahmood
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden
| | - Zaenab Fahad
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden
| | - Emile B Bolou-Bi
- UFR des Sciences de la Terre et des Ressources Minières, Département des Sciences du sol, Université Felix Houphouët-Boigny, 22 BP 582, Abidjan, Côte d'Ivoire
| | - Katharine King
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden
| | - Stephan J Köhler
- Department of Aquatic Sciences and Assessment, Soil-Water-Environment Center, Swedish University of Agricultural Sciences, Box 7050, SE-750 07, Uppsala, Sweden
| | - Kevin Bishop
- Department of Aquatic Sciences and Assessment, Soil-Water-Environment Center, Swedish University of Agricultural Sciences, Box 7050, SE-750 07, Uppsala, Sweden
| | - Alf Ekblad
- School of Science and Technology, Örebro University, SE-701 82, Örebro, Sweden
| | - Roger D Finlay
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden
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Kashi NN, Hobbie EA, Varner RK, Wymore AS, Ernakovich JG, Giesler R. Nutrients Alter Methane Production and Oxidation in a Thawing Permafrost Mire. Ecosystems 2022. [DOI: 10.1007/s10021-022-00758-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Wardle DA, Bellingham PJ, Kardol P, Giesler R, Tanner EVJ. Coordination of aboveground and belowground responses to local-scale soil fertility differences between two contrasting Jamaican rain forest types. OIKOS 2014. [DOI: 10.1111/oik.01584] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- David A. Wardle
- Dept of Forest Ecology and Management; Swedish Univ. of Agricultural Sciences; SE- 901 83 Umeå Sweden
| | | | - Paul Kardol
- Dept of Forest Ecology and Management; Swedish Univ. of Agricultural Sciences; SE- 901 83 Umeå Sweden
| | - Reiner Giesler
- Climate Impacts Research Centre, Dept of Ecology and Environmental Sciences; Umeå Univ.; Abisko Sweden
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Vincent AG, Sundqvist MK, Wardle DA, Giesler R. Bioavailable soil phosphorus decreases with increasing elevation in a subarctic tundra landscape. PLoS One 2014; 9:e92942. [PMID: 24676035 PMCID: PMC3968050 DOI: 10.1371/journal.pone.0092942] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 02/27/2014] [Indexed: 11/19/2022] Open
Abstract
Phosphorus (P) is an important macronutrient in arctic and subarctic tundra and its bioavailability is regulated by the mineralization of organic P. Temperature is likely to be an important control on P bioavailability, although effects may differ across contrasting plant communities with different soil properties. We used an elevational gradient in northern Sweden that included both heath and meadow vegetation types at all elevations to study the effects of temperature, soil P sorption capacity and oxalate-extractable aluminium (Alox) and iron (Feox) on the concentration of different soil P fractions. We hypothesized that the concentration of labile P fractions would decrease with increasing elevation (and thus declining temperature), but would be lower in meadow than in heath, given that N to P ratios in meadow foliage are higher. As expected, labile P in the form of Resin-P declined sharply with elevation for both vegetation types. Meadow soils did not have lower concentrations of Resin-P than heath soils, but they did have 2–fold and 1.5–fold higher concentrations of NaOH-extractable organic P and Residual P, respectively. Further, meadow soils had 3-fold higher concentrations of Alox + Feox and a 20% higher P sorption index than did heath soils. Additionally, Resin-P expressed as a proportion of total soil P for the meadow was on average half that in the heath. Declining Resin-P concentrations with elevation were best explained by an associated 2.5–3.0°C decline in temperature. In contrast, the lower P availability in meadow relative to heath soils may be associated with impaired organic P mineralization, as indicated by a higher accumulation of organic P and P sorption capacity. Our results indicate that predicted temperature increases in the arctic over the next century may influence P availability and biogeochemistry, with consequences for key ecosystem processes limited by P, such as primary productivity.
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Affiliation(s)
- Andrea G. Vincent
- Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
- * E-mail:
| | - Maja K. Sundqvist
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - David A. Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Reiner Giesler
- Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden
- Climate Impacts Research Centre, Department of Ecology and Environmental Sciences, Umeå University, Abisko, Sweden
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Olsson R, Giesler R, Loring JS, Persson P. Enzymatic hydrolysis of organic phosphates adsorbed on mineral surfaces. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:285-291. [PMID: 22103404 DOI: 10.1021/es2028422] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Esters of phosphoric acid constitute a sizable fraction of the total phosphorus supply in the environment and thus play an important role in the global phosphorus cycle. Enzymatic hydrolysis of these esters to produce orthophosphate is often a required reaction preceding phosphorus uptake by plants and microorganisms. Generally, adsorption to environmental particles is assumed to limit this process. Here we show, however, that the rate of enzymatic hydrolysis of glucose-1-phosphate (G1P) adsorbed on goethite by acid phosphatase (AcPase) can be of the same order of magnitude as in aqueous solution. The surface process releases carbon to the solution whereas orthophosphate remains adsorbed on goethite. This hydrolysis reaction is strictly an interfacial process governed by the properties of the interface. A high surface concentration of substrate mediates the formation of a catalytically active layer of AcPase, and although adsorption likely reduces the catalytic efficiency of the enzyme, this reduction is almost balanced by the fact that enzyme and substrate are concentrated at the mineral surfaces. Our results suggest that mineral surfaces with appropriate surface properties can be very effective in concentrating substrates and enzymes thereby creating microchemical environments of high enzymatic activity. Hence, also strongly adsorbed molecules in soils and aquatic environments may be subjected to biodegradation by extracellular enzymes.
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Affiliation(s)
- Rickard Olsson
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
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Černohlávková J, Jarkovský J, Hofman J. Effects of fungicides mancozeb and dinocap on carbon and nitrogen mineralization in soils. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:80-85. [PMID: 18755509 DOI: 10.1016/j.ecoenv.2008.07.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Revised: 06/30/2008] [Accepted: 07/02/2008] [Indexed: 05/26/2023]
Abstract
In our study, effects of fungicides mancozeb and dinocap on C and N mineralization were measured in arable and grassland soil. The soils were treated with these fungicides at the application and 10 times lower doses and then incubated at 20 degrees C for 2 weeks. Carbon mineralization (basal and substrate-induced respiration) and nitrogen mineralization (potential ammonification and nitrification) were evaluated 1 and 14 days after the treatment. After 14 days, ammonification was decreased to 48% and 83% at dinocap application dose in arable and grassland soil, respectively. Application dose of mancozeb caused significant decrease of nitrification to 11.2% and 5.6% in arable and grassland soil, respectively. Basal respiration and substrate-induced growth were rather stimulated by fungicides, especially at lower application doses. To conclude, potential risk may exist to soil microorganisms and their activities in soils treated routinely by mancozeb or dinocap.
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Affiliation(s)
- Jitka Černohlávková
- RECETOX-Research Centre for Environmental Chemistry and Ecotoxicology, Faculty of Science, Masaryk University, Kamenice 126/3, CZ-62500 Brno, Czech Republic
| | - Jiří Jarkovský
- RECETOX-Research Centre for Environmental Chemistry and Ecotoxicology, Faculty of Science, Masaryk University, Kamenice 126/3, CZ-62500 Brno, Czech Republic
| | - Jakub Hofman
- RECETOX-Research Centre for Environmental Chemistry and Ecotoxicology, Faculty of Science, Masaryk University, Kamenice 126/3, CZ-62500 Brno, Czech Republic.
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Schnurer Y, Persson P, Nilsson M, Nordgren A, Giesler R. Effects of surface sorption on microbial degradation of glyphosate. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2006; 40:4145-50. [PMID: 16856729 DOI: 10.1021/es0523744] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Sorption may affect the bioavailability and biodegradation of pesticides in soils. The aim of this study was to test the effect of surface sorption on microbial utilization of the herbicide glyphosate as a source of phosphorus, nitrogen, or carbon. We added goethite to a humus soil to manipulate the soil's glyphosate sorption capacity. The addition of glyphosate generally either decreased microbial CO2 production or produced no effect. Additions of glyphosate, in combination with glucose and N, did not change the respiration rate in comparison with the same treatment but without glyphosate. In contrast, glyphosate additions combined with glucose and P decreased microbial growth, whereas the combination with goethite counteracted the negative effect. The different treatments were examined using attenuated total reflectance Fourier transform (ATR-FTIR) spectroscopy; the results suggest that glyphosate was de-carboxylated in the sorbed state. Stimulating microbial growth by the addition of glucose and nitrogen resulted in further oxidation of glyphosate and only phosphate was detectable on the goethite surface after 13 days incubation. Our results show that sorbed glyphosate is microbially degradable, and it retards microbial activity. This study emphasizes the importance of combining quantitative measurements with a molecular-level examination, to better understand biogeochemical processes.
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Affiliation(s)
- Ylva Schnurer
- Department of Forest Ecology, Swedish University of Agricultural Sciences, 901 87 Umeå, Sweden
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