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

作者：Zhipeng Wang, Jianshuang Wu, Meng Li, Yanan Cao, Minyahel Tilahun, Ben Chen · 发表于：Ecological Indicators · 年份：2024 · DOI：10.1016/j.ecolind.2024.112140 · 被引用次数：25 · 研究领域：Tree-ring climate responses、Fire effects on ecosystems、Ecology and Vegetation Dynamics Studies

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 (γNDVITEM) and precipitation sensitivity (γNDVIPRE), 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 γNDVITEM and γNDVIPRE accounted for 29.8% and 20.1%, respectively, while remarkably increasing γNDVITEM and γNDVIPRE accounted for about 18.2% and 24.5%, respectively, of the vegetated lands across Eurasia. Declining γNDVITEM 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 γNDVIPRE was me...