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

Global Change Biology, Год журнала: 2023, Номер 30(1)

Опубликована: Дек. 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.

Язык: Английский

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Spatial variation of soil organic matter and metal mobility in wetland soils: Implications for biogeochemical processes in lateritic landscape

CATENA, Год журнала: 2024, Номер 237, С. 107810 - 107810

Опубликована: Янв. 13, 2024

Язык: Английский

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Contrasting stocks and origins of particulate and mineral-associated soil organic carbon in a mangrove-salt marsh ecotone

Geoderma, Год журнала: 2024, Номер 446, С. 116904 - 116904

Опубликована: Май 7, 2024

The global warming-driven poleward expansion of mangrove habitats (e.g., Avicennia germinans and Rhizophora mangle) into temperate salt marshes Spartina alterniflora Juncus roemerianus) has been shown to alter coastal soil organic carbon (SOC) storage. However, the taxa-specific consequences this vegetation shift on origin size SOC sub-fractions (particulate OC (POC); mineral-associated (MAOC); reactive iron-associated (FeR-MAOC)) remain largely unexplored. In study, we used a particle size-based fractionation method compare quantity δ13C composition bulk each in cores collected from Apalachicola Bay barrier islands Florida, USA, highest latitude where monospecific communities all four aforementioned plants co-occur. Depth-dependent variation clearly showed replacement S. by mangroves, as well reciprocal substitutions J. roemerianus, probably driven changes wetland elevation. Higher burial rates suggested that soils were principally developed deposition. contrast, comparatively lower but higher stocks marsh illustrated subsurface input roots. POC was primarily derived contemporary plant detritus; its concentration (58.8 ± 9.0 % SOC) relative mangroves (38.4 6.0 SOC). MAOC content did not vary across (53.5 10.9 SOC), originated microbially-transformed pre-existing plants. FeR-MAOC essentially absent R. mangle (2.9 3.6 while representing minor fraction three other (7.8 7.0 more like present-day surface plants, highlighting situ formation their active oxidizing rhizospheres.

Язык: Английский

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Soil organic carbon stocks and stabilization mechanisms in tidal marshes along estuarine gradients

Geoderma, Год журнала: 2025, Номер 456, С. 117274 - 117274

Опубликована: Март 30, 2025

Язык: Английский

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Mapping Soil Organic Matter in Black Soil Cropland Areas Using Remote Sensing and Environmental Covariates

Agriculture, Год журнала: 2025, Номер 15(3), С. 339 - 339

Опубликована: Фев. 4, 2025

The accurate prediction of soil organic matter (SOM) content is important for sustainable agriculture and effective management. This task particularly challenging due to the variability in factors influencing SOM distribution across different cultivated land types, as well site-specific responses remote sensing data environmental covariates, especially black region northeastern China, where exhibits significant spatial variability. study evaluated variations on importance imagery covariates zones. A total 180 samples (0–20 cm) were collected from Youyi County, Heilongjiang Province, multi-year synthetic bare images 2014 2022 (focusing April May) acquired using Google Earth Engine. Combining three types such drainage, climate topography, area was categorized into dry field paddy field. Then, model constructed random forest regression method accuracy strategies by 10-fold cross-validation. findings indicated that, (1) overall analysis, combining drainage variables May could attain highest accuracy, ranked follows: (RS) > (CLI) (DN) Topography (TP). (2) Zonal analysis conducted with a high degree precision, evidenced an R2 0.72 impressively low RMSE 0.73%. time window monitoring More specifically, optimal frames dryland identified May, while those fields concentrated May. (3) In addition, diverse observed vary types. regions characterized intricate fields, contributions assumed heightened importance. Conversely, featuring flat terrain, roles played more substantial role outcomes. These underscore selecting appropriate inputs improving accuracy.

Язык: Английский

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Can fine sediment addition promote carbon stabilization in coastal wetland soils? A laboratory experiment

Soil Science Society of America Journal, Год журнала: 2025, Номер 89(2)

Опубликована: Март 1, 2025

Abstract Scientists are increasingly exploring soil carbon (C) stabilization processes that protect organic C from microbial decomposition. Mineral‐associated matter (MAOM) is considered one of the most protected pools C, but remains understudied in wetland soils relative to upland soils. Using complementary intact core and bottle incubation studies, this research investigated how fine sediment addition, form dredged sediment, impacts respiration MAOM coastal vary by (SOM) content particle size. We hypothesized additions would reduce increase pools, with greatest response addition being high SOM soil. Contrary our prediction, sediments cores did not change rate, CO 2 production rate decreased 21% low cores, mass MAOM‐C increased 23% after receiving additions. In study only, varied initial Specifically, largest particles (>2 mm) showed a 1727% MAOM‐C, which coincides 49% decrease CH 4 rate. Overall, protection resulting differed type texture, suggesting properties (e.g., existing mineral content, nutrient availability, degree decomposition) influence through these should be when choosing potential restoration sites.

Язык: Английский

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Unraveling mechanisms of carbon enrichment via straw and biochar application to enhance soil fertility and improve maize yield

European Journal of Agronomy, Год журнала: 2025, Номер 169, С. 127673 - 127673

Опубликована: Май 7, 2025

Язык: Английский

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Soil Carbon Saturation: What Do We Really Know?

Global Change Biology, Год журнала: 2025, Номер 31(5)

Опубликована: Май 1, 2025

ABSTRACT Managing soils to increase organic carbon storage presents a potential opportunity mitigate and adapt global change challenges, while providing numerous co‐benefits ecosystem services. However, differ widely in their for sequestration, knowledge of biophysical limits accumulation may aid informing priority regions. Consequently, there is great interest assessing whether exhibit maximum capacity storing carbon, particularly within organo–mineral associations given the finite nature reactive minerals soil. While concept soil saturation has existed over 25 years, recent studies have argued against its importance. Here, we summarize conceptual understanding at both micro‐ macro‐scales, define key terminology, address common concerns misconceptions. We review methods used quantify saturation, highlighting theory caveats each approach. Critically, explore utility principles accumulation, vulnerability loss, representations process‐based models. highlight gaps propose next steps furthering our mechanistic implications management.

Язык: Английский

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Utilizing water level draw-down to remove excess organic matter in a constructed treatment wetland

The Science of The Total Environment, Год журнала: 2024, Номер 918, С. 170508 - 170508

Опубликована: Фев. 1, 2024

Язык: Английский

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Soil carbon dynamics in drained prairie pothole wetlands

Frontiers in Environmental Science, Год журнала: 2024, Номер 12

Опубликована: Март 15, 2024

Drainage leads to trade-offs between crop production efficiency and wetland conservation, with complex impacts on ecosystem services. In North America’s Prairie Pothole Region, drainage is widespread, often increase the available land for cultivation, prevent loss due flooding, manage soil salinity. Wetlands are known providing key services such as improved water quality, flood mitigation, carbon storage. There limited research how changes hydrology redistribution through can impact storage persistence in this region. This evaluates factors that contribute drained prairie pothole based 33 wetlands Saskatchewan, Canada. These analyses showed regional differences response of driven by environmental annual precipitation, temperature, permanence. We observed increasing from Dark Brown Black zones, well longer pond The sampling depth used calculating was especially important when comparing geographically across zones zone had greater stored at depth. Soil also intensively monitored over 2 years following installation surface a (8 wetlands) where partially directed consolidation wetland. further assessed dynamics protection microbial decomposition three organic matter fractions, ATR-FTIR functional groups, phospholipid fatty acid analysis understand community abundance structure. After drainage, ephemeral short permanence were found be most sensitive only class decreases carbon. temporary seasonal classes no significant content but there during implementation. Jointly, provides region-specific estimates inform management cultivated fields.

Язык: Английский

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