Drought change in growing season of Inner Mongolia and its response to climate based on VCI
QU Xuebin1, JIN Linxue2*, HONG Mei1, YUE Kun2, ZHAO Ziwei1
1. Hulunbuir Meteorological Service, Hulunbuir, Inner Mongolia 021008, China; 2. Center of Ecology and Agricultural Meteorology of Inner Mongolia, Hohhot, Inner Mongolia 010051, China
Abstract：In order to effectively carry out drought monitoring and drought relief in Inner Mongolia, the Vegetation Condition Index(VCI)was calculated based on the monthly MODIS vegetation growth data from May to September in 2000—2021. By combining the growing season temperature and precipitation data of 118 meteorological stations in Inner Mongolia, Sen trend analysis and partial correlation coefficient method was used to analyze the spatial and temporal variation of drought in the growing season of Inner Mongolia and its relationship with meteorological elements. The analysis results show that during the study period, the VCI in the growing season of Inner Mongolia shows an overall upward trend, for which the main rising areas are located in the southeastern Inner Mongolian farming-pastoral transition zone and the western grassland-desert transition zone. Under the positive interference of humans improves the drought resistance of vegetation in these areas significantly. The coefficient of variation ana-lysis shows that the drought risk in eastern Inner Mongolia is relatively high in late spring and early summer. With the arrival of summer, the drought high risk area moves westward to central Inner Mongolia. The range of drought risk in autumn increases, but the intensity decreases relatively. Low rainfall is the decisive determining meteorological factor for the occurrence of drought in Inner Mongolia, and there is a close relationship between high temperature and grassland drought. Drought analysis based on VCI can effectively reflect the improvement of regional drought resistance, and also provide scientific reference for fine-grained drought management.
曲学斌,金林雪*,红梅,越昆,赵子威. 基于VCI的内蒙古生长季干旱变化及对气候响应[J]. 排灌机械工程学报, 2023, 41(10): 1058-1064.
QU Xuebin,JIN Linxue*,HONG Mei,YUE Kun,ZHAO Ziwei. Drought change in growing season of Inner Mongolia and its response to climate based on VCI. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(10): 1058-1064.
