2001 - 2020年植被生产力对复合干旱的敏感性增加

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-04-12 DOI:10.1016/j.gloplacha.2025.104826

Jiwang Tang , Ben Niu , Zhigang Hu , Gang Fu , Xianzhou Zhang

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引用次数: 0

摘要

大气干旱和土壤干旱对植被生产力产生了重大影响，并且由于陆地-大气反馈通常同时发生。然而，植被对土壤干旱、大气干旱及其复合干旱响应的时间变化在很大程度上仍然未知。利用水汽压亏缺（VPD）、土壤湿度（SM）以及叶面积指数（LAI）和太阳诱导叶绿素荧光（SIF） 2个植被指数，通过符合分析量化了植被对这3种干旱类型的易感性，并评价了它们的时空格局。从空间上看，全球大部分植被区（63.8%）对复合干旱的易感程度较高，植被覆盖度较低的地区和气候较干旱的地区对复合干旱的易感程度较高。在时间上，我们发现了主要的增加趋势（LAI为0.0027年−1，SIF为0.0023年−1），P <；2001-2020年干旱易感区植被对复合干旱的敏感性与0.05)。我们的发现强调了生态系统对复合干旱的脆弱性日益增加，这可能对未来气候下土地碳汇的稳定性构成更多威胁。

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Increasing susceptibility of vegetation productivity to compound drought from 2001 to 2020

The atmospheric and soil droughts have exerted substantial effects on vegetation productivity, and generally occur simultaneously due to land-atmospheric feedback. However, the temporal changes in vegetation response to soil droughts, atmospheric droughts, and their compound droughts remain largely unknown. Using vapor pressure deficit (VPD), soil moisture (SM), and two vegetation indexes including the leaf area index (LAI) and solar-induced chlorophyll fluorescence (SIF), here we quantified the vegetation susceptibility to these three drought types via coincidence analysis and evaluated the spatiotemporal patterns of them. Spatially, we found most of global vegetated areas (63.8 %) were more susceptible to compound droughts, with the higher vegetation susceptibility to them in the areas with less tree cover and more arid climate, respectively. Temporally, we revealed a predominated increasing trend (0.0027 year⁻¹ for LAI and 0.0023 year⁻¹ for SIF, P < 0.05) in vegetation susceptibility to compound droughts over drought-susceptible regions during 2001–2020. Our finding highlighted an increasing ecosystem vulnerability to compound droughts, which could pose more threats on the stability of land carbon sink under future climate.

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.