Distinct, direct and climate‐mediated environmental controls on global particulate and mineral‐associated organic carbon storage

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Dec. 25, 2023

Abstract Identifying controls on soil organic carbon (SOC) storage, and where SOC is most vulnerable to loss, are essential managing soils for both climate change mitigation global food security. However, we currently lack a comprehensive understanding of the drivers especially with regards particulate (POC) mineral‐associated (MAOC). To better understand hierarchical POC MAOC, applied path analyses fractions, (i.e., mean annual temperature [MAT] precipitation minus potential evapotranspiration [MAP‐PET]), (C) input net primary production [NPP]), property data synthesized from 72 published studies, along generated National Ecological Observatory Network pits ( n = 901 total observations). assess utility investigating MAOC separately in storage controls, then compared these results another analysis predicting bulk storage. We found that negatively related MAT pH, while positively NPP MAP‐PET, but % sand. Our revealed similar trends explained less variation C than our analyses. Given pH impose constraints microbial decomposition, this indicates primarily controlled by loss processes. In contrast, strong relationships variables plant productivity constraints, moisture, mineral surface availability sorption indicate climate‐driven variations inputs soil, as well stabilization mechanisms. Altogether, demonstrate separate environmental variables, further justifying need quantify model fractions forecast responses change.

Language: Английский

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Conceptualizing soil fauna effects on labile and stabilized soil organic matter

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: June 17, 2024

Fauna is highly abundant and diverse in soils worldwide, but surprisingly little known about how it affects soil organic matter stabilization. Here, we review the ecological strategies of a multitude faunal taxa can affect formation persistence labile (particulate matter, POM) stabilized (mineral-associated MAOM). We propose three major mechanisms - transformation, translocation, grazing on microorganisms by which fauna alters factors deemed essential POM MAOM, including quantity decomposability mineralogy, abundance, location, composition microbial community. Determining relevance these to MAOM cross-disciplinary studies that cover individual more complex communities, employ physical fractionation, isotopic, microbiological approaches advance concepts, models, policies focused effectively manage as carbon sinks, nutrient stores, providers food.

Language: Английский

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Global pattern of organic carbon pools in forest soils

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(6)

Published: June 1, 2024

Understanding the mechanisms of soil organic carbon (SOC) sequestration in forests is vital to ecosystem budgeting and helps gain insight functioning sustainable management world forests. An explicit knowledge driving global SOC still lacking because complex interplays between climate, soil, forest type influencing pool size stability. Based on a synthesis 1179 observations from 292 studies across forests, we quantified relative importance property, total content specific contents physical (particulate vs. mineral-associated SOC) chemical (labile recalcitrant pools upper 10 cm mineral soils, as well stock O horizons. The variability soils was better explained by climate (47%-60%) factors (26%-50%) than NPP (10%-20%). particulate (POC) (ROC) all decreased with increasing mean annual temperature decomposition overrides C replenishment under warmer climate. (MAOC) influenced temperature, which directly affected microbial activity. Additionally, presence clay iron oxides physically protected forming MAOC. horizons larger temperate zone Mediterranean regions boreal sub/tropical zones. Mixed had 64% either broadleaf or coniferous (i) higher productivity (ii) litter input different tree species resulting diversification molecular composition community. While jointly determine formation stability SOC, predominantly controls patterns ecosystems.

Language: Английский

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Divergent accumulation of microbe- and plant-derived carbon in different soil organic matter fractions in paddy soils under long-term organic amendments

Agriculture Ecosystems & Environment, Journal Year: 2024, Volume and Issue: 366, P. 108934 - 108934

Published: Feb. 23, 2024

Language: Английский

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Enhanced Mineral Preservation Rather Than Microbial Residue Production Dictates the Accrual of Mineral‐Associated Organic Carbon Along a Weathering Gradient

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(6)

Published: March 18, 2024

Abstract Mineral preservation and microbial residue production are vital for the accumulation of mineral‐associated organic carbon (MAOC) in soils. However, their relative importance interactive effects remain unclear. Here MAOC content composition analyzed tandem with soil mineral attributes along a weathering gradient on volcanic sequence. We find that increases increasing states, accompanied by contribution to MAOC. rather than physiological traits strongly related contents, suggesting weathering‐enhanced capacity overrides governing reactive minerals. Furthermore, have strong effect composition, likely fungal abundance community weathering. These findings highlight may effectively boost persistent SOC synergy conversion long term.

Language: Английский

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Saline-alkali land reclamation boosts topsoil carbon storage by preferentially accumulating plant-derived carbon

Science Bulletin, Journal Year: 2024, Volume and Issue: 69(18), P. 2948 - 2958

Published: May 18, 2024

Language: Английский

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A landscape-scale view of soil organic matter dynamics

Nature Reviews Earth & Environment, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Language: Английский

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Unlocking Mechanisms for Soil Organic Matter Accumulation: Carbon Use Efficiency and Microbial Necromass as the Keys

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(1)

Published: Jan. 1, 2025

Soil microorganisms transform plant-derived C (carbon) into particulate organic (POC) and mineral-associated (MAOC) pools. While microbial carbon use efficiency (CUE) is widely recognized in current biogeochemical models as a key predictor of soil (SOC) storage, large-scale empirical evidence limited. In this study, we proposed experimentally tested two predictors POC MAOC pool formation: necromass (using amino sugars proxy) CUE (by 18O-H2O approach). sampling (0-10 10-20 cm depth) was conducted along climatic transect 900 km on the Loess Plateau, including cropland, grassland, shrubland, forest ecosystems, to ensure homogeneous parent material. We found highest accumulation occurred zones MAT between 5°C 10°C or MAP 300 500 mm. Microbial more positively related than (p < 0.05), suggesting that residues may improve strongly compared pool. Random linear regression analyses showed increased with fungal C, whereas bacterial drove MAOC. coupled 0.05) but decoupled SOC > 0.05). The have faster turnover rate due lack clay protection, which lead rapid thus their decoupling from CUE. sense, driven by necromass, explains dynamics. Our findings highlight insufficiency relying solely predict bulk storage. Instead, propose should be used together explain dynamics, each influencing distinct

Language: Английский

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“Reactive Mineral Sink” drives soil organic matter dynamics and stabilization

npj Materials Sustainability, Journal Year: 2023, Volume and Issue: 1(1)

Published: Nov. 27, 2023

Abstract Reactive primary and secondary minerals play a critical role in the transformation stabilization of organic matter (OM) soil, aspect that has been largely overlooked existing literature. In this regard, we propose new model known as “reactive mineral sink” (RMS) to illustrate three mechanisms through which these drive bioprocessing, transformation, transport OM soil. Firstly, from biological perspective, reactive influence enzymatic microbial processing binding proteins or influencing structure communities. Secondly, chemical standpoint, have capacity adsorb and/or coprecipitate with it, leading more diverse distribution This distribution, turn, triggers catalysis redox reactions. Thirdly, on physical level, substantial impact soil architecture, aggregate dynamics, porosity development, hydrological processes. These changes then affect transport, reprocessing OM. The RMS provides conceptual framework underscores fundamental driving dynamics carbon (C) sequestration natural Furthermore, it promotes restoration biogeochemical processes ecological resilience. We advocate for implementation strategies based enhance C soils purposes rejuvenating health mitigating CO 2 emission.

Language: Английский

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Stabilized microbial necromass in soil is more strongly coupled with microbial diversity than the bioavailability of plant inputs

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 190, P. 109323 - 109323

Published: Jan. 19, 2024

Microbial necromass carbon (C) can substantially contribute to stabilized soil organic matter (SOM), and effective management of this C may help mitigate climate change. However, factors important the formation microbial are only partly understood. While bioavailable plant inputs induce by boosting growth use efficiency, other traits, such as those related secretion systems or adhesion motility, also be relevant. These traits independent bioavailability modulated environmental depth site age. Such links, however, have hardly been studied. Here, we used replicated plots European alder (more inputs) Scots pine (less investigate links among inputs, depth, age, community composition, in SOM, i.e., particulate occluded within aggregates (oPOM) mineral-associated (MAOM). We did not find evidence that nor were major drivers formation. Instead, certain taxa, diversity particular, most tightly MAOM. contributed oPOM (up ∼57% stored fraction), a pool considered largely derive from biomolecules. Combined, MAOM accounted for ∼23% bulk contents. Our results imply C-focused research consider constraints on composition diversity, pools than MAOM, plant-derived SOM.

Language: Английский

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