气候变化领域集成服务门户(CCPortal): Spatial and temporal variations of ecosystem water use efficiency and its response to soil moisture drought in a water-limited watershed of northern China

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DOI	10.1016/j.jenvman.2024.120251
	Spatial and temporal variations of ecosystem water use efficiency and its response to soil moisture drought in a water-limited watershed of northern China
	Zhang, Ting; Quan, Wenjie; Tian, Jiyang; Li, Jianzhu; Feng, Ping
发表日期	2024
ISSN	0301-4797
EISSN	1095-8630
起始页码	355
卷号	355
英文摘要	Drought synchronously affects the water cycle and interferes with the carbon cycle in terrestrial ecosystems. Ecosystem water use efficiency (WUE), serving as a vital metric for assessing the interplay between water and carbon cycles, has found extensively use in exploring how ecosystems responses to drought. However, the effects of soil moisture drought on WUE are still poorly recognized. Taking Ziya River Basin as an example, the spatial-temporal variations of WUE from 2001 to 2020 were estimated by the Penman-Monteith-Leuning Version 2 (PML-V2) data. Based on the Standardized Soil Moisture Index (SSI) calculated from Soil Moisture of China by in situ data, version 1.0 (SMCI1.0) data, the sensitivity and thresholds of different vegetation WUE to drought magnitudes were investigated, and the influences of both lagged and cumulative effects of drought on WUE were further analyzed. Results showed that the annual mean WUE was 2.160 +/- 0.975 g C kg(-1) H2O-1 in the Ziya River Basin, with a significant increasing trend of 0.037 g C kg(-1) H2O-1 yr(-1) (p < 0.05). For all the vegetation types, the WUE reached the maximum value at a certain drought threshold (SSI = -1.5 +/- 0.1). The dominant factor controlling WUE sensitivity to drought changed from evapotranspiration (ET) to gross primary production (GPP) when severe drought transformed into extreme drought. Significant lagged and cumulative effects were found in the response of WUE to drought in nearly 58.64 % (72.94 %) of the study area, with an average time scale of 6.65 and 2.11 months (p < 0.05) respectively. Drought resistance in descending order was: forest > shrub > grassland > cropland. Our findings enrich the understanding of the coupled carbon and water cycle processes in terrestrial ecosystems and their response to soil moisture drought in the context of global climate change.
英文关键词	Soil moisture drought; Ecosystem water use efficiency; Drought threshold; Lagged effect; Cumulative effect
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001198984900001
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303759
作者单位	Tianjin University; China Institute of Water Resources & Hydropower Research
推荐引用方式 GB/T 7714	Zhang, Ting,Quan, Wenjie,Tian, Jiyang,et al. Spatial and temporal variations of ecosystem water use efficiency and its response to soil moisture drought in a water-limited watershed of northern China[J],2024,355.
APA	Zhang, Ting,Quan, Wenjie,Tian, Jiyang,Li, Jianzhu,&Feng, Ping.(2024).Spatial and temporal variations of ecosystem water use efficiency and its response to soil moisture drought in a water-limited watershed of northern China.JOURNAL OF ENVIRONMENTAL MANAGEMENT,355.
MLA	Zhang, Ting,et al."Spatial and temporal variations of ecosystem water use efficiency and its response to soil moisture drought in a water-limited watershed of northern China".JOURNAL OF ENVIRONMENTAL MANAGEMENT 355(2024).