ANALYSIS OF DROUGHT CHARACTERISTIC IN SUNIT PRAIRIE BASED ON PRECIPITATION ANOMALY PERCENTAGE

SUN Xiaodong;LIU Guixiang;BAO Yuhai;LU Yanfeng;College of Geographical Science,Inner Mongolia Normal University;Institute of Grassland Research,Chinese Academy of Agricultural Sciences;Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information System,Inner Mongolia Normal University;

Sunit Prairie;;Precipitation Anomaly Percentage;;drought

According to the monthly precipitation data collected from three meteorological stations in Xilingol League from 1980 to2015,annual,seasonal and monthly drought features in Sunit prairie for 36 years were detailed analysis by using precipitation anomaly percentage from drought frequency and the changing trends of drought. The results show that annual precipitation had decreased tendencyin Sunit prairie,Precipitation intensity showed a significantly decreasing trend in summer and winter,and the increasing trends of precipitation in spring and autumn. From annual and seasonal scale,the frequency of light drought and moderate drought were higher. The highest frequency of drought happened in March and April,and no extreme drought happened in July,August and September. Therefore,precipitation anomaly percentage basically reflected drought conditions in Sunitprairie,the research results were basically consistent with the actual situation,which provided theoretical basis for the relevant departments to corresponding drought- relief countermeasures,according to the drought feature of the region.