Impacts of climate extremes on ecosystem metrics in southwest China

文献类型： 外文期刊

第一作者： Shao, Hui

作者： Shao, Hui;Zhang, Yuandong;Liu, Shirong;Gu, Fengxue;Shi, Chunming;Miao, Ning

作者机构：

关键词： Climate extremes; Ecosystem dynamic; Atmospheric circulation; Impacts; Southwest China

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：6.551； 五年影响因子：6.419 ）

ISSN： 0048-9697

年卷期： 2021 年 776 卷

页码：

收录情况： SCI

摘要： Due to global warming, climate extremes are increasing significantly, which is greatly impacting ecosystems dynamics. Identified as a key ecological area, southwest China (SWC) has experienced frequent extreme climatic events. Using daily meteorological data and Moderate-Resolution Imaging Spectroradiometer data, we analyzed the spatiotemporal variations of 21 extreme climate indices (ECIs) and 3 ecosystem metrics, namely, normalized difference vegetation index (NDVI), leaf area index (LAI), and gross primary production (GPP), as well as the responses of these metrics to ECIs during 2000-2018. Our results showed that the regionally averaged NDVI, LAI, and GPP increased significantly in this period with annual rates of 0.003, 0.04 m(2) m(-2), and 10.58 g C m(-2), respectively (P < 0.001). Cold-related ECIs and consecutive wet days decreased, while warm-related ECIs, heavy precipitation days, and extreme precipitation intensity displayed the opposite trend. The sums (22.48%, 12.98%, and 32.70%, respectively) of the relative contribution proportions of the sensitive temperature-related ECIs (T-ECIs) to NDVI, LAI, and GPP were higher than that those (14.60%, 12.75%, and 16.37%, respectively) of the sensitive precipitation-related ECIs (P-ECIs). Ecosystem metrics were significantly correlated with most ECIs with time lags of 2-3-month. The correlation coefficients between large-scale atmospheric circulation indices and T-ECIs were significant (P < 0.05). The Atlantic Multidecadal Oscillation had a greater influence on T-ECIs than any other large-scale climatic oscillations. Our study indicated that T-ECIs had a greater impact on ecosystems than P-ECIs in SWC and that more attention should be paid to increasingly heavy precipitation and extreme high temperatures in the region. (C) 2021 Elsevier B.V. All rights reserved.

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