Analysis of driving forces and spatial scale effects on vegetation dynamics in the Qinghai Lake Basin
This study utilized Landsat images to analyse spatiotemporal variations of FVC in QHLB from 1986 to 2020.The driving mechanisms of the FVC changes at temporal and spatial scales was investigated,taking into account the influences of climate,surface conditions,and human activity by employing multiple linear regression and geodetector.Additionally,the mechanism of change was discussed,and the impact of spatial granularity on driving factors and their relative contributions was explored.The results shows that∶(1)the vegetation conditions in the QHLB have improved overall in the past 35 years,marked by an increase in vegetation types of medium and moderate height,along with a notable rise in FVC around the Qinghai Lake and the upper reaches of the Buha River;(2)On temporal scale,changes in FVC were primarily influenced by climate warming,humidification and ecological restoration initiatives;(3)On spatial scale,changes in FVC were controlled by climate,topography,vegetation,and soil,and the factor with greater explanatory power was temperature(0.41),elevation(0.34)and precipitation(0.30).Furthermore,the influence of climate,topography,and human activity exhibits a synergistic interaction,with temperature and elevation playing a controlling role in these interactions.Among these,the interaction between and factors such as water systems,precipitation,and human activities were particularly significant;(4)The spatial scale proved to be a critical factor influencing the contributions of driving factors.Therefore,taking into consideration the interaction of climate,surface conditions,and human factors,the optimal scale for investigating the FVC changes in QHLB was determined to be 6km.
fractional vegetation cover(FVC)spatio-temporal variationsclimate changehuman activitiesgeodetectorspatial scaleQinghai Lake Basin
万方数据
维普
