干旱区生态环境知识资源中心(Arid): Responses of ecosystem water use efficiency to meteorological drought under different biomes and drought magnitudes in northern China

Arid

DOI	10.1016/j.agrformet.2019.107660
	Responses of ecosystem water use efficiency to meteorological drought under different biomes and drought magnitudes in northern China
	Xu, Hao-jie 1,2,3,4; Wang, Xin-ping5 ; Zhao, Chuan-yan 1,2,3,4; Zhang, Xiao-xiao 6
通讯作者	Xu, Hao-jie
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2019
卷号	278
英文摘要	Future climate change scenarios predict that warming may increase drought stress over northern China, causing ecological deterioration and food insecurity. Water use efficiency (WUE) is an important indicator to understand the response of ecosystem productivity to water availability. At present we lack a clear picture of how ecosystem WUE responds to drought magnitude across a broad range of vegetation types and environments. Here, we applied Moderate Resolution Imaging Spectrometer (MODIS) satellite images and meteorological data to obtain a regional estimation of gross primary production (GPP) and evapotranspiration (ET) during the period of 2000-2014. We then investigated the relationships between WUE (GPP/ET) and drought magnitude (based on the Standardized Precipitation Evapotranspiration Index, SPEI) for different climate zones and biomes. The mean annual WUE decreased with increasing Aridity Index (AI) in arid regions. However, the relationships between WUE and AI followed a logarithmic function across semi-arid and humid regions. In hype-arid, sub-humid and humid regions, a drying trend resulted in increased WUE. Contrasting responses of WUE to drought were found in arid and semi-arid regions. The negative effect of drought that caused decreased WUE was most significant in the transition zone between arid and semi-arid lands. Besides, the relationships between relative changes in WUE and drought magnitude followed a logarithmic function of SPEI. Severe and extreme drought resulted in WUE reductions regardless of different hydroclimatic conditions and biomes. The ecosystem resistant to drought can be evaluated by the magnitude of WUE reductions during drought, together with the WUE-SPEI correlations. Forests were most resistant to drought, followed by croplands, grasslands, and deserts. Differences in the ecosystem resistance to water stress were attributed to diversities in drought survival traits and strategies. Given that hydroclimatic conditions break down ecosystem resistance under severe and extreme drought, we highlight an urgent need to formulate adaptation strategies aimed at reducing drought risk in the eastern and central portions of northern China.
英文关键词	Meteorological drought Water use efficiency Water availability Drought magnitude Ecosystem resistance
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000500196400017
WOS关键词	ALTERED PRECIPITATION REGIMES ; CLIMATE EXTREMES ; TERRESTRIAL ECOSYSTEMS ; SEMIARID ECOSYSTEMS ; VEGETATION GROWTH ; EDDY COVARIANCE ; PLANT-RESPONSES ; SUMMER DROUGHT ; ARID REGION ; VARIABILITY
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
EI主题词	2019-11-15
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310874
作者单位	1.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Gansu, Peoples R China; 2.Lanzhou Univ, Key Lab Grassland Livestock Ind Innovat, Minist Agr & Rural Affairs, Lanzhou 730020, Gansu, Peoples R China; 3.Lanzhou Univ, Engn Res Ctr Grassland Ind, Minist Educ, Lanzhou 730020, Gansu, Peoples R China; 4.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730020, Gansu, Peoples R China; 5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Shapotou Desert Res & Expt Stn, Lanzhou 730000, Gansu, Peoples R China; 6.Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Xu, Hao-jie,Wang, Xin-ping,Zhao, Chuan-yan,et al. Responses of ecosystem water use efficiency to meteorological drought under different biomes and drought magnitudes in northern China[J]. 兰州大学,2019,278.
APA	Xu, Hao-jie,Wang, Xin-ping,Zhao, Chuan-yan,&Zhang, Xiao-xiao.(2019).Responses of ecosystem water use efficiency to meteorological drought under different biomes and drought magnitudes in northern China.AGRICULTURAL AND FOREST METEOROLOGY,278.
MLA	Xu, Hao-jie,et al."Responses of ecosystem water use efficiency to meteorological drought under different biomes and drought magnitudes in northern China".AGRICULTURAL AND FOREST METEOROLOGY 278(2019).