Mechanisms of soil organic carbon and nitrogen stabilization in mineral-associated organic matter – insights from modeling in phase space

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(18), P. 4077 - 4098

Published: Sept. 19, 2024

Abstract. Understanding the mechanisms of plant-derived carbon (C) and nitrogen (N) transformation stabilization in soil is fundamental for predicting capacity to mitigate climate change support other functions. The decomposition plant residues particulate organic matter (POM) contributes formation mineral-associated (on average more stable) (MAOM) soil. MAOM formed from binding dissolved (ex vivo pathway) or microbial necromass bioproducts (in minerals metal colloids. Which these two (SOM) pathways important under which conditions remains an open question. To address this question, we propose a novel diagnostic model describe C N dynamics as function POM decomposition. Focusing on relations among compartments (i.e., modeling phase space) rather than time trajectories allows isolating processes underlying stabilization. Using combination with database 36 studies residue were tracked into MAOM, found that predominantly fueled by produced microbes decomposing POM. relevance pathway higher clayey soils but lower C-rich N-poor added residues. Overall, our space proved be sound tool mechanistic investigation supported current understanding critical role both mineral soils.

Language: Английский

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Scaling High‐Resolution Soil Organic Matter Composition to Improve Predictions of Potential Soil Respiration Across the Continental United States

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(4)

Published: Feb. 12, 2025

Abstract Despite the importance of microbial soil organic matter (SOM) respiration in regulating flux carbon between soils and atmosphere, cycling models remain primarily based on climate properties, leading to large uncertainty predictions. To address this knowledge gap, we analyzed high‐resolution water‐extractable SOM profiles from cores collected across United States by 1,000 Soils Pilot Molecular Observation Network. Our innovation lies using machine learning distill thousands formula into tractable units; it enables integrating data molecular measurements models. In surface soils, chemistry provided better estimates potential than physicochemistry, them combined yielded best prediction. Overall, identify specific subsets molecules that may improve predictions global create a strong basis for developing new representations process‐based

Language: Английский

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Effects of exogenous and endogenous Mn on litter decomposition at different stages under continuous N addition in a subtropical forest

Forest Ecology and Management, Journal Year: 2025, Volume and Issue: 585, P. 122614 - 122614

Published: March 12, 2025

Language: Английский

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The role of legume roots in carbon sequestration, soil health enhancement, and salinity mitigation under climate change: A comprehensive review

Soil and Tillage Research, Journal Year: 2025, Volume and Issue: 253, P. 106656 - 106656

Published: May 14, 2025

Language: Английский

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Spatial Distribution of Soil Carbon and Nitrogen Content in the Danjiangkou Reservoir Area and Their Responses to Land-Use Types

Sustainability, Journal Year: 2024, Volume and Issue: 16(1), P. 444 - 444

Published: Jan. 4, 2024

Understanding the spatial distribution of soil properties is essential for comprehending fertility, predicting ecosystem productivity, enhancing environmental quality, promoting sustainable agriculture, and addressing global climate change. This study focuses on investigating influencing factors carbon (C) nitrogen (N) in Danjiangkou Reservoir area, a vital water source South-to-North Water Transfer Project. Utilizing both geostatistical traditional statistical methods, this research explores impact various land-use types—such as orchards, drylands, paddy fields, Hydro-Fluctuation Belts (HF belts)—on C N content. The findings reveal predominantly low levels organic (SOC) (ranging from 2.95 to 21.50 g·kg−1), total (TN) 0.27 2.44 available (AN) 18.20 170.45 mg·kg−1), mostly falling into deficient categories. Notably, variability observed, especially agriculturally developed regions, leading areas enrichment. Paddy fields HF belts are identified influential contributors increased SOC content compared orchards drylands. Correlation stepwise regression analyses unveil intricate interactions among SOC, TN, AN, factors, underscoring necessity holistic approach management. emphasizes critical role adopting rational types agricultural practices effective management area.

Language: Английский

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Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(5)

Published: May 1, 2024

Abstract Manganese (Mn) is a redox‐active micronutrient that has been shown to accelerate plant litter decomposition; however, the effect of Mn‐promoted decomposition on soil C storage unclear. We present novel biogeochemical model simulating how Mn bioavailability influences organic (SOC) stocks in profile (<50 cm) within temperate forest. In our model, foliar increased response increasing soluble released through Mn‐oxide (birnessite) dissolution mineral layers. The ensuing enrichment leaf redistributed surface forest floor layer, promoted enzymatic oxidation lignin, and decreased SOC stocks. Total loss was partially mitigated by accumulation lignin‐oxidation products as mineral‐associated C. also explored Mn‐driven changes interacted with effects N deposition warming. Nitrogen inhibited Mn‐dependent lignin degradation, weakening their dependence bioavailability. Warming stimulated reduced but less effective at low Our results suggest are sensitive because uptake redistributes soils where it can enhance decomposition. Based simulations, we predict becomes limiting poorly soluble. Depletion bioavailable or other cofactors critical could limit warming over time, quantitative projections role regulating requires additional measurements constrain uncertainties.

Language: Английский

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Mechanisms of soil organic carbon and nitrogen stabilization in mineral associated organic matter – Insights from modelling in phase space

Published: April 19, 2024

Abstract. Understanding the mechanisms of plant-derived carbon (C) and nitrogen (N) transformation stabilization in soil is fundamental for predicting capacity to mitigate climate change support other functions. The decomposition plant residues particulate organic matter (POM) contributes formation mineral associated (on average more stable) (MAOM) soil. MAOM formed from binding dissolved (ex vivo pathway) or microbial necromass bioproducts (in minerals metal colloids. Which these two (SOM) pathways important under which conditions remains an open question. To address this question, we propose a novel diagnostic model describe C N dynamics as function POM decomposition. Focusing on relations among compartments (i.e., modelling phase space) rather than time trajectories allows isolating processes underlying stabilization. Using combination with database ~ 40 studies residue were tracked into MAOM, found that predominantly fuelled by produced microbes decomposing POM—the so-called ‘in vivo’ pathway relevance higher clayey soils, but lower rich soils poor added residues. Overall, our space proved be sound tool mechanistic investigation supported current understanding critical role both soils.

Language: Английский

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Supplementary material to "Mechanisms of soil organic carbon and nitrogen stabilization in mineral associated organic matter – Insights from modelling in phase space"

Published: April 19, 2024

Generalized model including dissolved organic matter dynamicsC and N are transferred between POM MAOM compartments partly via (DOM), which is only considered implicitly in the presented main text (Fig. 1).In this appendix, we present a more general DOM compartment, show simplifications lead to used text.To construct model, assume that fraction of depolymerized products from locally by respective microbial communities (fractions 1 - , respectively) 'shared' compartment respectively).DOM then taken up both according rates equilibrium (i.e., ⁄ ≈ 0) because it small C with relatively fast turnover rates.Mathematically, means + allows simplifying Eq. ( 1)-( 5) obtain described (after re-naming = ).

Language: Английский

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Storage and export of nutrient and oxyhydroxide elements across glaciated soils and watersheds in western Massachusetts, USA

CATENA, Journal Year: 2023, Volume and Issue: 228, P. 107174 - 107174

Published: April 24, 2023

Language: Английский

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Scaling High-resolution Soil Organic Matter Composition to Improve Predictions of Potential Soil Respiration Across the Continental United States

EarthArXiv (California Digital Library), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 13, 2024

Despite the importance of microbial respiration soil organic matter (SOM) in regulating carbon flux between soils and atmosphere, cycling models remain primarily based on climate properties, leading to large uncertainty predictions. With data from 1000 Soils Pilot Molecular Observation Network (MONet), we analyzed high resolution water-extractable SOM profiles standardized cores across United States address this knowledge gap. Our innovation lies using machine learning distill thousands formula into tractable units; it enables integrating molecular measurements models. In surface soils, chemistry provided better estimates potential than physicochemistry, them combined yielded best prediction. Overall, identify specific subsets molecules that may improve predictions global create a strong basis for developing new representations process-based

Language: Английский

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