气候变化领域集成服务门户(CCPortal): Moderate Grazing Increases Water Use Efficiency for Environmental Health in Alpine Meadows of the Tibetan Plateau

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DOI	10.3389/fevo.2021.684321
	Moderate Grazing Increases Water Use Efficiency for Environmental Health in Alpine Meadows of the Tibetan Plateau
	Wang, Yunying; Pei, Weiwei; Cao, Guangmin; Guo, Xiaowei; Zhou, Huakun; Du, Yangong
通讯作者	Du, YG (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining, Peoples R China. ; Du, YG (通讯作者)，Qinghai Normal Univ, Coll Geol, Xining, Peoples R China.
发表日期	2021
ISSN	2296-701X
卷号	9
英文摘要	Water use efficiency is an important indicator of drought tolerance in plants. The response of the water use efficiency to different grazing intensities and adaptive mechanisms in alpine meadows remains unclear. To understand the changes in water use in alpine meadow ecosystems under different grazing gradients, grazing systems have to be optimized, and severely receding grasslands should be effectively restored. This study analyzed the response of water use efficiency of plant dominant species, coexisting species, and functional group-level plants to grazing intensity using the delta C-13 index in an alpine meadow. We found that grazing increased the leaf carbon isotope composition in plants (delta C-13) of Gramineae by 3.37% and grazing at a moderate level significantly increased it by 4.84% (P < 0.05). In addition, an increase in delta C-13 was observed in the functional groups of Cyperaceae (3.45%), Leguminosae (0.81%), and Forb (1.40%). However, some dominant species and coexisting species showed the highest delta C-13 values under moderate grazing. These results indicate that moderate grazing may significantly improve the water use efficiency of species in alpine meadows. The path analysis showed that water use efficiency was negatively correlated with evapotranspiration (P < 0.05), soil water content, soil organic carbon, and soil bulk density. Nevertheless, there was a positive correlation between water use efficiency and the available nitrogen. This study concluded that moderate grazing could improve the efficiency of grassland water use to a certain extent. Additionally, soil evapotranspiration was the main driving factor affecting the water use efficiency of alpine meadows.
关键词	CARBON-ISOTOPE DISCRIMINATION NITROGEN SOIL GRASSLANDS BIOMASS PRODUCTIVITY EXCLUSION COMMUNITY C-13
英文关键词	available nitrogen; evapotranspiration; environmental factors; grazing activity; delta C-13
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000739060000001
来源期刊	FRONTIERS IN ECOLOGY AND EVOLUTION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254446
作者单位	[Wang, Yunying; Pei, Weiwei; Cao, Guangmin; Guo, Xiaowei; Zhou, Huakun; Du, Yangong] Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining, Peoples R China; [Wang, Yunying; Pei, Weiwei] Univ Chinese Acad Sci, Coll Resource & Environm, Beijing, Peoples R China; [Du, Yangong] Qinghai Normal Univ, Coll Geol, Xining, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yunying,Pei, Weiwei,Cao, Guangmin,et al. Moderate Grazing Increases Water Use Efficiency for Environmental Health in Alpine Meadows of the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,9.
APA	Wang, Yunying,Pei, Weiwei,Cao, Guangmin,Guo, Xiaowei,Zhou, Huakun,&Du, Yangong.(2021).Moderate Grazing Increases Water Use Efficiency for Environmental Health in Alpine Meadows of the Tibetan Plateau.FRONTIERS IN ECOLOGY AND EVOLUTION,9.
MLA	Wang, Yunying,et al."Moderate Grazing Increases Water Use Efficiency for Environmental Health in Alpine Meadows of the Tibetan Plateau".FRONTIERS IN ECOLOGY AND EVOLUTION 9(2021).