气候变化领域集成服务门户(CCPortal): Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet

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DOI	10.1016/j.agrformet.2023.109745
	Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet
	Zhang, Tao; Tang, Yuanyuan; Shan, Baoxin; Xu, Mingjie; Cong, Nan; Chen, Ning; Ji, Ximeng; Zhao, Guang; Zheng, Zhoutao; Zhu, Juntao; Zhang, Yangjian
发表日期	2023
ISSN	0168-1923
EISSN	1873-2240
卷号	342
英文摘要	Drought is a threat universally faced by global terrestrial ecosystems under global climate change. The habitat of alpine ecosystems is harsh, and they necessitate to use the limited resources efficiently to survive. However, drought occurred frequently during the short growing season, which greatly affected their resource use efficiency (RUE). In this study, based on long-term flux and microclimate observations in a typical alpine meadow ecosystem in northern Tibet, the effects of drought on RUE, including water use efficiency (WUE), light use efficiency (LUE), and carbon use efficiency (CUE), were studied. The results indicate that droughts could change the driving paths of abiotic and biotic factors on carbon and water fluxes and hence affect RUE. When vegetation exhibits robust physiological activity, droughts could enhance the control effects of biotic factors. The droughts that occurred at different periods of the growing season showed divergent effects on RUE. In the early-growing season, the strong photosynthetic capacity of the nascent leaves facilitated enhancements in WUE and LUE in response to drought conditions. However, the CUE did not increase significantly due to the heightened con-sumption of organic matter by respiration. The mid-growing season droughts led to a sharp decrease in gross primary productivity (GPP), consequently leading to a decline in WUE, LUE and CUE. During the late-growing season, droughts together with the decomposition of chlorophyll reduced the photosynthetic capacity and led to a significant decrease in LUE. The diminished physiological activity of the senescent leaves led to insensitive responses of WUE and CUE to droughts. These findings indicate that RUE might primarily be regulated by factors affecting GPP rather than others. This study would be beneficial for assessing the responses and adaptation characteristics of alpine meadow ecosystems to future climate change and could help accurately predict their possible evolution trends.
关键词	Water use efficiency Light use efficiency Carbon use efficiency Gross primary productivity Evapotranspiration Grassland
英文关键词	WATER-USE EFFICIENCY; GROSS PRIMARY PRODUCTION; GAP FILLING STRATEGIES; LIGHT USE EFFICIENCY; TERRESTRIAL ECOSYSTEMS; CLIMATE VARIABILITY; CARBON FLUXES; PRIMARY PRODUCTIVITY; CO2; PHOTOSYNTHESIS
WOS研究方向	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001091929400001
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283162
作者单位	Shenyang Agricultural University; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; Northeast Institute of Geography & Agroecology, CAS; Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zhang, Tao,Tang, Yuanyuan,Shan, Baoxin,et al. Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet[J],2023,342.
APA	Zhang, Tao.,Tang, Yuanyuan.,Shan, Baoxin.,Xu, Mingjie.,Cong, Nan.,...&Zhang, Yangjian.(2023).Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet.AGRICULTURAL AND FOREST METEOROLOGY,342.
MLA	Zhang, Tao,et al."Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet".AGRICULTURAL AND FOREST METEOROLOGY 342(2023).