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DOI	10.1016/j.geoderma.2023.116760
	The ability of soils to aggregate, more than the state of aggregation, promotes protected soil organic matter formation
	Even, Rebecca J.; Cotrufo, M. Francesca
发表日期	2024
ISSN	0016-7061
EISSN	1872-6259
起始页码	442
卷号	442
英文摘要	Efforts to increase soil organic carbon (SOC) are pursued as a viable climate change mitigation strategy. Boosting SOC stocks requires increasing plant carbon (C) inputs and promoting their persistence in SOC. In well aerated mineral soils, water soluble inputs are expected to stabilize through chemical binding to minerals, forming mineral-associated organic carbon (MAOC) before or after microbial transformation, while structural inputs are expected to stabilize as particulate organic carbon (POC) via protection in soil aggregates. Although ample research is centered on the effects of soil aggregation, its disturbance (e.g., tillage), and microbial processing on SOC cycling, we still lack mechanistic understanding of how plant C input type (i.e., soluble versus structural) and disturbance (i.e., aggregate disruption) independently and in interaction affect POC and MAOC formation and stabilization in soils with inherently different degrees of aggregation. To this end, using 13C enriched structural and soluble plant inputs, we traced SOC formation and stabilization in a lab incubation experiment in soils with differing levels of aggregation, and capacity to form aggregates after disturbance. Our results showed that soluble plant inputs contributed substantially to MAOC and that higher formation and persistence of MAOC occurred in the highly aggregated soil. Moreover, the highly aggregated soil retained more soluble inputs stabilized as MAOC when disturbed. Disturbance in this fine textured, organic carbon rich soil stimulated regeneration of aggregates around structural plant inputs leading to greater persistence of aggregate-occluded POC. Soluble plant inputs, specifically, as well as structural plant inputs in the highly aggregated disturbed soil, compensated for SOC lost due to disturbance alone. Overall, this study provides mechanistic evidence suggesting that management strategies for SOC accrual should consider soil type, aggregation potential, and plant attributes to inform decisions surrounding tillage frequency and cropping regimes. Our mechanistic findings require testing. If confirmed in the field, they would suggest that no disturbance in tandem with high structural plant C inputs would benefit most SOC accrual in systems with soils that have little capacity to form organo-mineral complexes, including large aggregates. On the contrary, with sustained plant inputs, occasional disturbance in systems with soils that have a high capacity to form organo-mineral complexes can promote both POC and MAOC formation and stabilization.
英文关键词	Particulate organic matter; Mineral associated organic matter; 13C; Soil aggregation; Soil disturbance; Soil organic matter
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001163979000001
来源期刊	GEODERMA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306076
作者单位	Colorado State University
推荐引用方式 GB/T 7714	Even, Rebecca J.,Cotrufo, M. Francesca. The ability of soils to aggregate, more than the state of aggregation, promotes protected soil organic matter formation[J],2024,442.
APA	Even, Rebecca J.,&Cotrufo, M. Francesca.(2024).The ability of soils to aggregate, more than the state of aggregation, promotes protected soil organic matter formation.GEODERMA,442.
MLA	Even, Rebecca J.,et al."The ability of soils to aggregate, more than the state of aggregation, promotes protected soil organic matter formation".GEODERMA 442(2024).