The variability in sensitivity of vegetation greenness to climate change across Eurasia

文献类型： 外文期刊

第一作者： Wang, Zhipeng

作者： Wang, Zhipeng;Wu, Jianshuang;Tilahun, Minyahel;Chen, Ben;Li, Meng;Cao, Yanan;Tilahun, Minyahel

作者机构：

关键词： Terrestrial greening; Vegetation sensitivity; Biomes; Elevated CO 2; Nitrogen deposition; Eurasia

期刊名称：ECOLOGICAL INDICATORS （ 影响因子：7.0； 五年影响因子：6.6 ）

ISSN： 1470-160X

年卷期： 2024 年 163 卷

页码：

收录情况： SCI

摘要： Climate change is one of dominators driving the greening of vegetation worldwide, which is expected to enhance land carbon sink and mitigate global warming. The sensitivity of vegetation greenness to climate change is fluctuant and regulated by other environmental factors. However, the drivers and mechanisms behind remain unclear so far. Here, we hired long-term satellite-based vegetation index (NDVI), climatic variables, nitrogen deposition, and atmospheric CO2 records to investigate variations of greenness climatic sensitivity and its drivers across Eurasia. To obtain the timeseries of temperature (gamma NDVITEM) and precipitation sensitivity (gamma NDVIPRE), we applied multi-regression models and regressed temperature and precipitation on NDVI in each 9-year moving windows. The results showed that the area of vegetation greenness limited by low temperatures substantially shrunk, while the area of vegetation greenness limited by precipitation deficit increased during 1982-2015. Specifically, significantly decreasing gamma NDVITEM and gamma NDVIPRE accounted for 29.8% and 20.1%, respectively, while remarkably increasing gamma NDVITEM and gamma NDVIPRE accounted for about 18.2% and 24.5%, respectively, of the vegetated lands across Eurasia. Declining gamma NDVITEM was widely observed in most biomes, including tropical and subtropical moist broadleaf forests, temperate broadleaf and mixed forests, temperate coniferous forests, croplands, and deserts and xeric shrublands. Substantially increasing gamma NDVIPRE was merely found in montane grasslands and shrublands, and tropical and subtropical dry broadleaf forests, while decreasing gamma NDVIPRE and nonlinear regimes was widely proved in other biome types. Spatially, rather than elevated CO2 and nitrogen deposition, climate factors (temperature, precipitation, and radiation) jointly dominated gamma NDVITEM and gamma NDVIPRE variations across nearly 45% and 48% of Eurasia respectively. Our results uncovered the apparent pattern of greenness climate sensitivity changes across Eurasia and highlighted the necessity to unfold the underlying mechanisms based on plant physiology and traits.

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