Potential evapotranspirations of growing seasons from 72 meteorological stations in three provinces of northeastern China during 1960-2008 are calculated by Penman-Monteith model. Ratio between potential evapotranspiration and precipitation is computed,and aridity of growing seasons for each of the stations is got. With the maximum value in western Liaoning and the minimum value in northern Heilongjiang,aridity of growing seasons demonstrates a variation characteristic of gradual decreasing from the southwe...
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