Analyzing Driving Factors of Drought in Growing Season in the Inner Mongolia Based on Geodetector and GWR Models

As an important ecological security barrier in northern China, the Inner Mongolia Autonomous Region (hereinafter referred to as Mongolia) is seriously affected by drought. It of great significance characterize spatial distribution drought and identify influencing factors Due complex interactions among driving factors, it difficult quantify contribution each factor using linear correlation analysis alone. In this study, we used Standardized Precipitation Evapotranspiration Index (SPEI) a quantitative indicator discuss spatiotemporal variation during growing seasons from 2000 2018. We quantitatively characterized mode, scope, intensity changes SPEI caused drought-influencing such weather, water, topography, soil, human activities Geodetector Geographically Weighted Regression (GWR) models. concluded that about 20.3% region showed downward trend SPEI, with fastest rate decline central western Mongolia. Air temperature, precipitation, elevation, distance rivers are main controlling change, nonlinear enhancement. The effect was obvious Alxa League, Wuhai City, Ulanqab Baotou City. results will help us understand effects on eventually policymakers water-resource management.