Divergent trends in grassland degradation and desertification under land use and climate change in Central Asia from 2000 to 2020

作者：Yanbo Zhao, Jie Wang, Geli Zhang, Luo Liu, Jilin Yang, Xiaocui Wu, Çhandrashekhar Biradar, Jinwei Dong, Xiangming Xiao · 发表于：Ecological Indicators · 年份：2023 · DOI：10.1016/j.ecolind.2023.110737 · 被引用次数：41 · 研究领域：Rangeland Management and Livestock Ecology、Remote Sensing in Agriculture、Tree-ring climate responses

Grassland degradation (within-state change) and desertification (state conversion from grasslands to deserts) are different states in the complex dynamic process of grassland deterioration. However, the dynamics and associated drivers of the two states have been rarely examined separately, which is critical for early warning and conservation policy making. Here, the grassland degradation and desertification in Central Asia (CA) were studied due to their evident vulnerability to climate extremes and human activities. We performed a two-step approach to identify the critical state zones first (i.e., grasslands, deserts, and the desertification zones) and then assess the vegetation dynamics within each zone. Finally, we quantified the roles of CO2 fertilization effect, climate change, climate variability, land use (LU), and anthropogenic climate change (ACC) on the vegetation dynamics in different state zones. The results showed that the areas of grasslands and sparse vegetation regions (including deserts and desertification zones) were stable from 2000 to 2020, but the trends of vegetation greenness were divergent with a reduction in grasslands and an increase in sparse vegetation regions. Furthermore, climate change and climate variability were the main driving force affecting grassland degradation in CA. Yet the vegetation greening in the desertification and desert zones was mainly driven by the rising CO2 and LU. Moreover, ACC degraded 20.63% of grasslands and sparsely veget...