1958-2023年内蒙古植被干旱时空特征与驱动因素分析OA

Drought is among the most prevalent extreme climate events in Inner Mongolia,China,resulting in di-minished crop yields and the degradation of grasslands.This phenomenon poses a significant threat to the stabili-ty of the regional ecological environment and the safety of agricultural production.To better understand the spa-tiotemporal evolution characteristics and driving mechanisms of drought,this study analyzed the spatiotemporal distribution characteristics,changing trends,and driving factors of vegetation drought in Inner Mongolia from 1958 to 2023 based on the crop water stress index(CWSI).Additionally,the time-lag effect of CWSI on the main driving factors was further explored.The results indicate that:(1)The distribution characteristics of the multi-year average CWSI in Inner Mongolia exhibit evident spatial heterogeneity,with higher values observed in the southwest and lower values in the northeast.Furthermore,the proportion of areas demonstrating a monotonically increasing CWSI trend from 1958 to 2023 reached 70.5%,and the abrupt breakpoints primarily occurred around 2000,with 1998 being the most significant.(2)Precipitation and temperature are the primary driving factors of vegetation drought in Inner Mongolia.The q values of the interaction between precipitation and temperature are nearly all above 0.8,indicating a highly significant relationship between the two factor.(3)The precipitation re-sponse of the CWSI in the entire region exhibits an average lag of 1.61 months,whereas the response to tempera-ture is weaker but with a shorter lag time,averaging 1.33 months.This study quantitatively analyzed the time-lag effect of vegetation drought on climatic factors,thereby providing a theoretical foundation and technical support for drought monitoring in Inner Mongolia.