Management‐induced changes in soil organic carbon and related crop yield dynamics in China's cropland

Global Change Biology, Год журнала: 2023, Номер 29(13), С. 3575 - 3590

Опубликована: Апрель 6, 2023

Enhancing soil organic carbon (SOC) sequestration and food supply are vital for human survival when facing climate change. Site-specific best management practices (BMPs) being promoted adoption globally as solutions. However, how SOC crop yield related to each other in responding BMPs remains unknown. Here, path analysis based on meta-analysis machine learning was conducted identify the effects potential mechanisms of relationship between responds site-specific China. The results showed that could significantly enhance maintain or increase yield. maximum benefits (30.6%) (79.8%) occurred mineral fertilizer combined with inputs (MOF). Specifically, optimal would be achieved areas were arid, pH ≥7.3, initial content ≤10 g kg-1 , duration >10 years, nitrogen (N) input level 100-200 kg ha-1 . Further revealed original change an inverted V-shaped structure. association changes might linked positive role nutrient-mediated effect. generally suggested improving can strongly support better performance. Limitations increasing still exist due low level, regions where excessive N inputs, inappropriate tillage is inadequate diminished by optimizing harmony conditions.

Язык: Английский

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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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The ability of soils to aggregate, more than the state of aggregation, promotes protected soil organic matter formation

Geoderma, Год журнала: 2024, Номер 442, С. 116760 - 116760

Опубликована: Янв. 11, 2024

Efforts to increase soil organic carbon (SOC) are pursued as a viable climate change mitigation strategy. Boosting SOC stocks requires increasing plant (C) inputs and promoting their persistence in SOC. In well aerated mineral soils, water soluble expected stabilize through chemical binding minerals, forming mineral-associated (MAOC) before or after microbial transformation, while structural particulate (POC) via protection aggregates. Although ample research is centered on the effects of aggregation, its disturbance (e.g., tillage), processing cycling, we still lack mechanistic understanding how C input type (i.e., versus structural) aggregate disruption) independently interaction affect POC MAOC formation stabilization soils with inherently different degrees aggregation. To this end, using 13C enriched inputs, traced lab incubation experiment differing levels capacity form aggregates disturbance. Our results showed that contributed substantially higher occurred highly aggregated soil. Moreover, retained more stabilized when disturbed. Disturbance fine textured, rich stimulated regeneration around leading greater aggregate-occluded POC. Soluble specifically, disturbed soil, compensated for lost due alone. Overall, study provides evidence suggesting management strategies accrual should consider type, aggregation potential, attributes inform decisions surrounding tillage frequency cropping regimes. findings require testing. If confirmed field, they would suggest no tandem high benefit most systems have little organo-mineral complexes, including large On contrary, sustained occasional complexes can promote both stabilization.

Язык: Английский

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Global pattern of organic carbon pools in forest soils

Global Change Biology, Год журнала: 2024, Номер 30(6)

Опубликована: Июнь 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.

Язык: Английский

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Integrating rainwater harvesting and organic soil amendment to enhance crop yield and soil nutrients in agroforestry

Environment Development and Sustainability, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Язык: Английский

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Climate and plant controls on soil organic matter in coastal wetlands

Global Change Biology, Год журнала: 2018, Номер 24(11), С. 5361 - 5379

Опубликована: Июнь 29, 2018

Coastal wetlands are among the most productive and carbon-rich ecosystems on Earth. Long-term carbon storage in coastal occurs primarily belowground as soil organic matter (SOM). In addition to serving a sink, SOM influences wetland ecosystem structure, function, stability. To anticipate mitigate effects of climate change, there is need advance understanding environmental controls SOM. Here, we investigated influence four formation factors: climate, biota, parent materials, topography. Along northern Gulf Mexico, collected plant data across elevation zonation gradients within 10 estuaries that span broad temperature precipitation gradients. Our results highlight importance climate-plant indicate scale location dependent. plants sensitive change; small changes or can transform communities. Across region, was greatest mangrove forests salt marshes dominated by graminoid plants. lower flats lacked vascular succulent We quantified strong relationships between precipitation, salinity, productivity, Low leads high which limits productivity appears constrain accumulation. analyses use from but our be related globe provide foundation for predicting ecological future reductions freshwater availability. many services dependent highly vulnerable change. Collectively, regulated cascading availability could impact stability affect supply some services.

Язык: Английский

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Sustaining crop production in China's cropland by crop residue retention: A meta‐analysis

Land Degradation and Development, Год журнала: 2019, Номер 31(6), С. 694 - 709

Опубликована: Ноя. 14, 2019

Abstract Crop residue retention (RR) is a recommended practice in China and globally. However, comprehensive assessment of changes mechanisms affecting crop production soil processes with RR thus identifying systems sustainable residues management are not widely studied. A national meta‐analysis was conducted to assess 24 indicators (related quality, nutrients, yield, environmental impacts) along their relationships under through 4,910 comparisons from 278 publications across China's croplands. Positively, significantly increased yield (7.8%), organic carbon (SOC) pool (12.3% 36.8%), nutrient reserves (1.9% 15.2%), temperature (6.7%), water contents (5.9%) improved structure when compared removal ( P < .05). Negatively, may increase acidification emissions greenhouse gases (by 31.7%, 130.9%, 12.2% for CO 2 , CH 4 N O). Nonetheless, the negative effects can be alleviated, positive strengthened by adopting conjunction appropriate crops, specific farming practices, avoiding more than 10 years consecutive use. The results indicated that higher decomposition native newly added matters, induced attendant physical properties, could enhance dynamics SOC, microbial biomass, final emissions. Thus, sustainability RR‐based system enhanced careful choice adoption integrated practices. Proper strategies offer climate‐smart solution ensure food security sustain productivity.

Язык: Английский

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Climate and litter C/N ratio constrain soil organic carbon accumulation

National Science Review, Год журнала: 2019, Номер 6(4), С. 746 - 757

Опубликована: Март 28, 2019

Abstract Soil organic carbon (SOC) plays critical roles in stabilizing atmospheric CO2 concentration, but the mechanistic controls on amount and distribution of SOC global scales are not well understood. In turn, this has hampered ability to model C budgets find measures mitigate climate change. Here, based data from a large field survey campaign with 2600 plots across China's forest ecosystems collection published forested land, we that low litter carbon-to-nitrogen ratio (C/N) high wetness index (P/PET, precipitation-to-potential-evapotranspiration ratio) two factors promote accumulation, only minor contributions quantity soil texture. The demonstrated plant diversity decreased C/N thus indirectly promoted accumulation by increasing quality. We conclude any changes plant-community composition, plant-species richness environmental can reduce ratio, or climatic increase index, may accumulation. study provides guideline for modeling cycle various ecosystem formulates principle land-based actions mitigating rising concentration.

Язык: Английский

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Residue retention promotes soil carbon accumulation in minimum tillage systems: Implications for conservation agriculture

The Science of The Total Environment, Год журнала: 2020, Номер 740, С. 140147 - 140147

Опубликована: Июнь 11, 2020

Язык: Английский

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Nonlinear relationship of vegetation greening with nature and human factors and its forecast – A case study of Southwest China

Ecological Indicators, Год журнала: 2019, Номер 111, С. 106009 - 106009

Опубликована: Дек. 19, 2019

Язык: Английский

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