Response of Vegetation to Extreme Climate Events Change in Typical Steppe in Inner Mongolia

In this paper, the extreme climate index was extracted by using the RClimdex model and the Kriging spatial interpolation was applied to the extreme climate index from the 1982-2015 daily temperature and precipitation data of 19 meteorological stations in the typical grassland area of Inner Mongolia. The correlation analysis was performed with the GIMMS NDVI3g vegetation index data. To understand the response of vegetation in typical grassland areas of Inner Mongolia to extreme climate changes. The results show that: In addition to CDD and FD0, all indexes showed an increasing trend before 2000 and a decreasing trend after 2000. The CDD showed a continuous decrease trend, and FD0 decreased first and then increased. There was a significant positive correlation between NDVI and SDII and RX5D in extreme grassland areas in Inner Mongolia and a weak negative correlation with CDD. However, the correlation with the extreme temperature index is not obvious. The area where SU25 is significantly negatively correlated with NDVI is larger, and TNn is obviously weakly negatively correlated. Therefore, it can be seen that extreme precipitation affects the dynamic change of vegetation in typical grassland areas more than extreme temperatures.