干旱区生态环境知识资源中心(Arid): Grazing exclusion enhances plant and topsoil carbon stocks in arid and semiarid grasslands

Arid

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
通讯作者	Yu, LF ; Sun, WJ (corresponding author), Chinese Acad Sci, Inst Bot, 20 Nanxincun, Beijing 100093, Peoples R China.
来源期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
EISSN	1873-2305
出版年	2021
卷号	320
英文摘要	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.
英文关键词	Grazing removal Plant carbon Restoration Soil carbon Soil moisture Temperate grassland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000691679400003
WOS关键词	NORTHERN CHINA GRASSLANDS ; BELOW-GROUND BIOMASS ; SOIL ORGANIC-CARBON ; INNER-MONGOLIA ; COMMUNITY COMPOSITION ; MICROBIAL BIOMASS ; LAND-USE ; NITROGEN ; STORAGE ; MANAGEMENT
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368291
作者单位	[Yu, Lingfei; Sun, Wenjuan; Huang, Yao] 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]. 中国科学院植物研究所,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).