Dynamic response mechanisms of temperate steppe to climate change and human activities on the Qinghai Plateau
Temperate steppe is a crucial area for maintaining the balance between grassland and livestock and ensuring ecological security on the Qinghai Plateau.It is highly sensitive to both climate change and human activities.This study constructs long-term,high-resolution grassland type data using the Google Earth Engine(GEE)platform and integrates climate data.By introducing random forest modeling to simulate the nonlinear relationship between climate factors and temperate steppe,we improve traditional residual analysis and explore the spatiotemporal evolution and driving factors of temperate steppe on the Qinghai Plateau.The results indicate that:(1)From 1987 to 2020,the temperate steppe area on the Qinghai Plateau exhibited a significant increasing trend,particularly in regions such as the Gonghe Basin,Chaka Basin,and the eastern side of the Qaidam Basin,with only 21.4％showing a decrease.(2)The proportion of areas on the Qinghai Plateau with a positive correlation of temperature and precipitation were 58.1％and 67.3％,respectively,with significant correlation areas exceeding 15％.This indicates that warmer and wetter climate conditions facilitate an increase in grassland area.(3)The increase in temperate steppe area is mainly influenced by climate change and human activities,with regions where these factors contribute over 75％covering 33.1％and 32.6％,respectively,concentrated in the eastern and southern parts of the study area.Conversely,human activities predominantly drive the decrease in grassland area,mainly in the Yellow River Basin and some areas around the Qinghai Lake.This quantitative research on the spatiotemporal changes and driving factors of temperate steppe on the Qinghai Plateau provides support for sustainable grassland development and policy formulation.
万方数据
维普
