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Thornthwaite's moisture index
desert.
桑斯威特湿润指数
(Thornthwate (1984)所提出的这一湿润指数是以降水满足植物生长情况为前提的。雨量满足植物生长者,湿润指数为零;指数0%〜20%称作半湿润气候; 20%〜40%称作半干旱气候、40%以上称作干旱气候。这一指数的计算公式是 Im=(100s-60d)/n。式中、s为水分剩余额;d 为水分不足额;n 为水分需要量)
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