东北地区生长季潜在蒸散量的变化特征分析

Variation Characteristics of Potential Evapotranspiration in Growing Season of Crops in Northeast China

采用1998年联合国粮农组织修订的Penman-Monteith模型计算了东北三省1960-2008年期间各地的潜在蒸散量。东北地区潜在蒸散量的基本分布特征为南多北少,随着纬度的增加,潜在蒸散量随纬度递减的特征越来越明显。近50年来东北地区生长季潜在蒸散量呈显著的增加趋势,东北北部增加趋势比南部更为显著,其中9月增加趋势最为显著。

Potential evapotranspiration of growing season in Northeast China during 1960-2008 is computed by using Penman-Monteith model which was emended by FAO in 1998.Potential evapotranspiration in southern area is higher than that of northern area in Northeast China.With higher latitude,it is more obvious that the potential evapotranspiration becomes lower.There is a significant increasing trend of potential evapotranspiration in recent 50 years,especially in northern area and in September.