Drought limits alpine meadow productivity in northern Tibet

doi:10.1016/j.agrformet.2021.108371

	Drought limits alpine meadow productivity in northern Tibet
	Xu, Mingjie 1,4; Zhang, Tao 1,3,4; Zhang, Yangjian 2,3,4; Chen, Ning 3,4; Zhu, Juntao 3,4; He, Yongtao 4; Zhao, Tingting 1; Yu, Guirui 4
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-06-15
卷号	303 页码:9
关键词	Atmospheric drought Soil drought GPP Sensible heat flux Grassland Tibetan Plateau
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2021.108371
通讯作者	Zhang, Tao(zhangt@syau.edu.cn) ; Zhang, Yangjian(zhangyj@igsnrr.ac.cn)
英文摘要	Under global climate change, warmer temperatures and changing precipitation patterns will increase the relative importance of soil and atmospheric droughts in limiting productivities across different ecosystems, especially in the fragile and sensitive ecosystem on the Tibetan Plateau. Therefore, the present study examined the effects of atmospheric drought, soil drought and compound drought on alpine meadow productivity based on seven years of continuous observational data. The results demonstrated that water conditions dominated the variations in alpine meadow productivity in northern Tibet. Gross prime productivity (GPP) in the growing season was significantly inhibited during soil drought (defined as soil water content (SWC) < 0.11 m(3) m(-3)) or atmospheric drought (defined as vapor pressure deficit (VPD) > 0.61 kPa) conditions. Pooling of the moisture data according to these thresholds revealed that soil drought occurred more frequently and accounted for 20.4% of all observed days. Atmospheric drought occurred in 2.4% of all days, and the frequency of compound drought (when SWC < 0.11 m(3) m(-3) and VPD > 0.61 kPa) was 8.7%. Compound drought reduced GPP by the largest extent to as much as 1.47 g C m(-2) d(-1). Atmospheric drought reduced GPP by 1.10 g C m(-2) d(-1). However, the more frequent soil drought reduced GPP by the smallest extent, with a value of 0.69 g C m(-2) d(-1). In spite of this, soil drought played an important role in restricting the accumulated GPP of this alpine meadow via its higher occurrence frequency and longer duration. All three types of drought significantly increased sensible heat flux (H), which provided positive feedbacks to droughts and led to further decreases in GPP. The results of the present study suggest that drought greatly threatens the alpine meadow ecosystem in northern Tibet. Therefore, more attention should be paid to water conditions under the global climate change context.
资助项目	National Natural Science Foundation of China[31600362] ; National Natural Science Foundation of China[31500360] ; National Natural Science Foundation of China[32061143037] ; National Natural Science Foundation of China[41725003] ; National Key R&D Program of China[2017YFA0604801] ; China Postdoctoral Science Foundation[2018M631819]
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000639140200005
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161746]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Tao; Zhang, Yangjian
作者单位	1.Shenyang Agr Univ, Coll Agron, Postdoctoral Res Stn Crop Sci, Shenyang 110866, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Xu, Mingjie,Zhang, Tao,Zhang, Yangjian,et al. Drought limits alpine meadow productivity in northern Tibet[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,303:9.
APA	Xu, Mingjie.,Zhang, Tao.,Zhang, Yangjian.,Chen, Ning.,Zhu, Juntao.,...&Yu, Guirui.(2021).Drought limits alpine meadow productivity in northern Tibet.AGRICULTURAL AND FOREST METEOROLOGY,303,9.
MLA	Xu, Mingjie,et al."Drought limits alpine meadow productivity in northern Tibet".AGRICULTURAL AND FOREST METEOROLOGY 303(2021):9.