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Drought-induced resource use efficiency responses in an alpine meadow ecosystem of northern Tibet

文献类型：期刊论文

作者Zhang, Tao; Tang, Yuanyuan; Shan, Baoxin; Xu, Mingjie; Cong, Nan5; Chen, Ning4; Ji, Ximeng; Zhao, Guang5; Zheng, Zhoutao5; Zhu, Juntao3,5
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2023-11-15
卷号342页码:109745
关键词Water use efficiency Light use efficiency Carbon use efficiency Gross primary productivity Evapotranspiration Grassland
DOI10.1016/j.agrformet.2023.109745
产权排序2
文献子类Article
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.
WOS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Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号WOS:001091929400001
源URL[http://ir.igsnrr.ac.cn/handle/311030/199461]  
专题生态系统网络观测与模拟院重点实验室_外文论文
作者单位1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
5.Shenyang Agr Univ, Coll Agron, Shenyang 110866, Peoples R China
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]. AGRICULTURAL AND FOREST METEOROLOGY,2023,342:109745.
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,342,109745.
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):109745.

入库方式： OAI收割

来源：地理科学与资源研究所

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