气候变化领域集成服务门户(CCPortal): Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates

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DOI	10.1016/j.geoderma.2024.116869
	Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates
	Jilling, Andrea; Sokol, Noah W.; Moran-Rivera, Karen; Grandy, Stuart
发表日期	2024
ISSN	0016-7061
EISSN	1872-6259
起始页码	445
卷号	445
英文摘要	Mineral particles provide reactive sites for organic carbon (C) to bind in soil; this 'mineral-associated organic matter' (MAOM) may persist for centuries to millennia or cycle rapidly in minutes to days. The conditions and processes that influence short and long-term cycling of MAOM are poorly constrained. Soil moisture is one key control on organic matter cycling in soil, and projected shifts in moisture regimes towards more intense rainfall and prolonged drought under climate change may alter MAOM formation and cycling. Here, in a 3-week laboratory incubation study, we evaluated how two contrasting moisture regimes affected the formation and cycling of 13C-labeled MAOM from two mineralogically-distinct soil types. Repeated wet-dry cycling (between 3% and 60% of water-holding capacity) enhanced the formation of 13C-MAOM relative to constant moisture conditions. The two soil types differed in rates of MAOM formation and the sensitivity of newly-formed and pre-existing MAOM to subsequent priming in the presence of simulated exudates (glucose and/or oxalic acid). Wet-dry cycling enhanced the decomposition of newly-formed MAOM and it further accelerated the potential priming of pre-existing MAOM. Therefore, while repeated cycles between drought-like and optimal moisture conditions may promote the formation of MAOM, they may also undermine the stability of pre-existing MAOM and limit opportunities for new C inputs to enter more persistent forms.
英文关键词	Mineral-associated organic matter; Wet-dry cycles; Priming
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001228787200001
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/296620
作者单位	University of South Carolina System; University of South Carolina Columbia; United States Department of Energy (DOE); Lawrence Livermore National Laboratory; Wageningen University & Research; University System Of New Hampshire; University of New Hampshire
推荐引用方式 GB/T 7714	Jilling, Andrea,Sokol, Noah W.,Moran-Rivera, Karen,et al. Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates[J],2024,445.
APA	Jilling, Andrea,Sokol, Noah W.,Moran-Rivera, Karen,&Grandy, Stuart.(2024).Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates.GEODERMA,445.
MLA	Jilling, Andrea,et al."Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates".GEODERMA 445(2024).