基于标准化降水蒸散指数（SPEI）的毛乌素沙地1981—2020年干旱特征研究

廉泓林, 韩雪莹, 刘雅莉, 韩雨晴, 杨文斌, 熊伟

Study on spatiotemporal characteristics of atmospheric drought from 1981 to 2020 in the Mu Us Sandy Land of China based on SPEI index

Honglin Lian, Xueying Han, Yali Liu, Yuqing Han, Wenbin Yang, Wei Xiong

表1 基于标准化降水蒸散指数（SPEI）的干旱等级划分

Table 1 The classification of drought grade based on SPEI

干旱等级 干旱类型 SPEI数值范围 1 无旱 SPEI>-0.5 2 轻旱 -1.0<SPEI≤-0.5 3 中旱 -1.5<SPEI≤-1.0 4 重旱 -2.0<SPEI≤-1.5 5 特旱 SPEI≤-2.0