5:我国的干旱度指标分布图( Distribution of aridity in China) 干旱度=蒸发势/降水量 Aridity Potential Evaporation / Rainfal 25100干旱度＝蒸发势/降水量 Aridity = Potential Evaporation / Rainfall 图5: 我国的干旱度指标分布图 我国的干旱度指标分布图 (Distribution Distribution of aridity in China of aridity in China)