干旱区生态环境知识资源中心(Arid): Water-use efficiency in response to simulated increasing precipitation in a temperate desert ecosystem of Xinjiang, China

Arid

	Water-use efficiency in response to simulated increasing precipitation in a temperate desert ecosystem of Xinjiang, China
	Huang Gang; Li Yan; Mu Xiaohan; Zhao Hongmei; Cao Yanfeng
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2017
卷号	9 期号:6 页码:823-836
英文摘要	Water-use efficiency(WUE)is a key plant functional trait that plays a central role in the global cycles of water and carbon. Although increasing precipitation may cause vegetation changes, few studies have explored the linkage between alteration in vegetation and WUE. Here, we analyzed the responses of leaf WUE, ecosystem carbon and water exchanges, ecosystem WUE, and plant community composition changes under normal conditions and also under extra 15% or 30% increases in annual precipitation in a temperate desert ecosystem of Xinjiang, China. We found that leaf WUE and ecosystem WUE showed inconsistent responses to increasing precipitation. Leaf WUE consistently decreased as precipitation increased. By contrast, the responses of the ecosystem WUE to increasing precipitation are different in different precipitation regimes: increasing by 33.9% in the wet year(i.e., the normal precipitation years)and decreasing by 4.1% in the dry year when the precipitation was about 30% less than that in the wet year. We systematically assessed the herbaceous community dynamics, community composition, and vegetation coverage to explain the responses of ecosystem WUE, and found that the between-year discrepancy in ecosystem WUE was consistent with the extent to which plant biomass was stimulated by the increase in precipitation. Although there was no change in the relative significance of ephemerals in the plant community, its greater overall plant biomass drove an increased ecosystem WUE under the conditions of increasing precipitation in 2011. However, the slight increase in plant biomass exerted no significant effect on ecosystem WUE in 2012. Our findings suggest that an alteration in the dominant species in this plant community can induce a shift in the carbon- and water-based economics of desert ecosystems.
英文关键词	desert ecosystem ecosystem water-use efficiency gross carbon exchange increasing precipitation leaf water-use efficiency net carbon exchange Gurbantunggut Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6108416
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335873
作者单位	Huang Gang, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, State Key Lab of Desert and Oasis Ecology, Urumqi, Xinjiang 830011, China.; Li Yan, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, State Key Lab of Desert and Oasis Ecology, Urumqi, Xinjiang 830011, China.; Mu Xiaohan, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, State Key Lab of Desert and Oasis Ecology, Urumqi, Xinjiang 830011, China.; Zhao Hongmei, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, Xinjiang 830052, China.; Cao Yanfeng, Geology Science Department, Shannxi Normal University, Xi'an, Shaanxi 710062, China.
推荐引用方式 GB/T 7714	Huang Gang,Li Yan,Mu Xiaohan,et al. Water-use efficiency in response to simulated increasing precipitation in a temperate desert ecosystem of Xinjiang, China[J],2017,9(6):823-836.
APA	Huang Gang,Li Yan,Mu Xiaohan,Zhao Hongmei,&Cao Yanfeng.(2017).Water-use efficiency in response to simulated increasing precipitation in a temperate desert ecosystem of Xinjiang, China.Journal of Arid Land,9(6),823-836.
MLA	Huang Gang,et al."Water-use efficiency in response to simulated increasing precipitation in a temperate desert ecosystem of Xinjiang, China".Journal of Arid Land 9.6(2017):823-836.