Increased contribution of root exudates to soil carbon input during grassland degradation

doi:10.1016/j.soilbio.2020.107817

	Increased contribution of root exudates to soil carbon input during grassland degradation
	Shen, Xing ; Yang, Fan 1; Xiao, Chunwang ; Zhou, Yong 2
	2020
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	146
摘要	The contribution of root exudates to soil carbon (C) inputs is poorly quantified, especially for grasslands under the context of degradation that includes simultaneous shifts in species composition due to long-term overgrazing. The objectives of this study were to examine (1) how grassland degradation affects root exudation rate and (2) to what extent root exudates contribute to soil C inputs compared to litter materials and root turnover during degradation. A field experiment was conducted in a temperate grassland, with different levels of degradation (undegraded control, moderately degraded, and severely degraded), dominated by different species in Inner Mongolia. Aboveground biomass, root biomass, and root exudate rate were measured monthly during a growing season. Root exudation rates differed among dominant plant species across the degradation gradients and grassland degradation significantly increased root exudation rates at the plot level. However, the amount of root exudates released to soils in degraded sites was lower than in undegraded site due to reduced living root biomass. Compared to the undegraded control, the relative contribution of root exudates to soil C inputs was enhanced by grassland degradation as a result of decreased contributions from root turnover. These findings prove grassland degradation can alter the relative contribution of root exudates compared to other soil C inputs and highlight the necessity of further studies to examine how this shift may affect soil organic C formation and long-term storage.
关键词	Root exudates Root turnover Litter materials Soil carbon input Grassland degradation Species composition
学科领域	Soil Science
DOI	10.1016/j.soilbio.2020.107817
收录类别	SCI
语种	英语
WOS关键词	FINE-ROOT ; GRAZING INTENSITY ; ORGANIC-CARBON ; PLANT-GROWTH ; RHIZOSPHERE ; DYNAMICS ; BIOMASS ; MANAGEMENT ; NITROGEN ; FOREST
WOS研究方向	Agriculture
WOS记录号	WOS:000536199300006
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31770501] ; National Key Research and Development Program of China [2016YFC0500501]
作者邮箱	cwxiao@muc.edu.cn ; yong.zhou@yale.edu
引用统计	被引频次：63[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21746
专题	植被与环境变化国家重点实验室
作者单位	1.Minzu Univ China, Coll Life & Environm Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 3.Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06520 USA
推荐引用方式 GB/T 7714	Shen, Xing,Yang, Fan,Xiao, Chunwang,et al. Increased contribution of root exudates to soil carbon input during grassland degradation[J]. SOIL BIOLOGY & BIOCHEMISTRY,2020,146.
APA	Shen, Xing,Yang, Fan,Xiao, Chunwang,&Zhou, Yong.(2020).Increased contribution of root exudates to soil carbon input during grassland degradation.SOIL BIOLOGY & BIOCHEMISTRY,146.
MLA	Shen, Xing,et al."Increased contribution of root exudates to soil carbon input during grassland degradation".SOIL BIOLOGY & BIOCHEMISTRY 146(2020).

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