气候变化领域集成服务门户(CCPortal): Soil organic matter formation and loss are mediated by root exudates in a temperate forest

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DOI	10.1038/s41561-022-01079-x
	Soil organic matter formation and loss are mediated by root exudates in a temperate forest
	Chari, Nikhil R.; Taylor, Benton N.
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	1011
结束页码	+
卷号	15 期号:12 页码:12
英文摘要	The amount and composition of root exudates-low-molecular-weight carbon compounds released from living plant roots into soil-are expected to shift under global change, and a growing body of work indicates that root exudates have important impacts on stable soil organic matter dynamics. However, most research on exudate effects on soil organic matter uses highly homogenized or artificial soil, leaving major uncertainties in how exudates will influence carbon dynamics in natural, intact soil systems. We used C-13-labelled artificial root exudates to examine the effects of exudation rate and type on stable soil organic matter formation and loss in intact forest soil cores collected over a heterogeneous gradient in a temperate hardwood forest. We observed effects of different exudate treatments on stable soil carbon dynamics that overrode native soil heterogeneity, and higher exudation rates enhanced mineral-associated organic matter turnover but not accumulation. Organic and amino acid exudates led to net mineral-associated organic matter accumulation, with amino acids having particularly strong positive effects on microbial biomass. Simple sugars increased mineral-associated organic matter turnover (both formation and loss) but did not alter the size of this pool. Our results suggest that predicted increases in root exudation rates and compositional shifts towards simple sugars under global change may reduce soils' C storage capacity. The amount and composition of carbon compounds released from plant roots into soil influences soil carbon formation and loss, according to an artificial root exudate experiment using intact soil cores from a temperate forest.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000889417500003
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272599
作者单位	Harvard University; Harvard University
推荐引用方式 GB/T 7714	Chari, Nikhil R.,Taylor, Benton N.. Soil organic matter formation and loss are mediated by root exudates in a temperate forest[J],2022,15(12):12.
APA	Chari, Nikhil R.,&Taylor, Benton N..(2022).Soil organic matter formation and loss are mediated by root exudates in a temperate forest.NATURE GEOSCIENCE,15(12),12.
MLA	Chari, Nikhil R.,et al."Soil organic matter formation and loss are mediated by root exudates in a temperate forest".NATURE GEOSCIENCE 15.12(2022):12.