Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands

doi:10.1016/j.agee.2021.107605

	Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands
	Yu, Lingfei; Sun, Wenjuan; Huang, Yao
	2021
发表期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
卷号	320
摘要	Grazing exclusion (GE) is widely considered to be an important strategy for restoring overgrazed grasslands and promoting carbon (C) storage. However, the changes in the components of ecosystem C with GE and their related drivers remain largely unexplored. Here, we investigated the effects of GE on the ecosystem C components (plant and soil C stocks) and their key driving factors through sampling inside and outside 15 grazing exclosures across the Inner Mongolia arid and semiarid grasslands in northern China. Our results showed that, except for dead root C, GE significantly promoted plant C stocks. The increase of C stocks in AGB and litter resulted from the increases of both biomass and C concentration, while the increase in live root C stock was mainly attributed to biomass accumulation. GE also promoted the topsoil (0-10 cm) C stocks but had little effect on the subsoil (10-30 cm) C stocks. Overall, GE had no significant effect on total ecosystem C stocks. Our results further indicated that across the grasslands, GE likely enhanced C accumulation in AGB, litter and live root in more humid and/or fertile sites. We also found that the increases of C stocks in AGB and litter were driven by the direct effects of GE and its indirect effects mediated by soil water content. The increases of C stocks in live root and topsoil with GE were linked to only high soil water contents. The generalizability of the soil water effect was confirmed by a metaanalysis which further revealed that across the grasslands of China, the responses of ecosystem C components to GE were associated with changes in soil water conditions. Therefore, our study highlighted the important role of soil water in regulating ecosystem C dynamics with GE at the national scale. Overall, our results showed that across arid and semiarid grasslands, GE is generally beneficial for plant and topsoil C accumulation. However, GE effects mediated by soil water on ecosystem C components may change to some extent due to altered soil water conditions under climate change.
关键词	Grazing removal Plant carbon Restoration Soil carbon Soil moisture Temperate grassland
学科领域	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
DOI	10.1016/j.agee.2021.107605
收录类别	SCI
语种	英语
WOS关键词	NORTHERN CHINA GRASSLANDS ; SOIL ORGANIC-CARBON ; INNER-MONGOLIA ; COMMUNITY COMPOSITION ; MICROBIAL BIOMASS ; LAND-USE ; NITROGEN ; STORAGE ; MANAGEMENT ; STEPPE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000691679400003
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1873-2305
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences [XDA27010103-2] ; National Natural Science Foundation of China [31670484]
作者邮箱	yulf@ibcas.ac.cn ; sunwj@ibcas.ac.cn
引用统计	被引频次：11[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/2S10CLM1/26632
专题	植被与环境变化国家重点实验室
作者单位	Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Yu, Lingfei,Sun, Wenjuan,Huang, Yao. Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2021,320.
APA	Yu, Lingfei,Sun, Wenjuan,&Huang, Yao.(2021).Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,320.
MLA	Yu, Lingfei,et al."Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 320(2021).

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