摘要:利用洮河流域7个气象站1971—2010年的地面气象观测资料，根据Holdridge生命地带模型对洮河流域近40 a的干燥度变化进行了分析。结果表明：近40 a洮河流域内可能蒸散率（PER）以0.02·10a^-1～0.07·10a^-1的趋势上升，20世纪90年代后PER的平均值比20世纪90年代前上升了0.12，洮河流域从20世纪90年代开始出现了明显的变干的趋势；近40 a洮河流域温度呈明显上升趋势，上升趋势为0.32～0.54℃·10a^-1，20世纪80年代末到90年代洮河流域气温出现了暖突变；降水量呈减少的趋势，其中以中、下 游减少最明显，减少趋势为13.3～21.8 mm·10a^-1；洮河流域出现了明显的暖干化趋势。

关键词:干燥度  Holdridge生命地带  暖干化  洮河流域

AbstractUsing the surface meteorological observed data in 7 climate stations in Taohe River Basin, according to the Holdridge life zone model analyzed the variety of arid index in Taohe River Basin in recent 40 years(1971～2010). The results shown that: The possible evapotranspiration rate (PER) was increasing by the tendency of 0.02 to 0.07·10a^-1 in Taohe River Basin in recent 40 years, the mean PER was increased 0.12 after the 1990s comparing before 1990s. From starting 90th 20 century, the Taohe River Basin occured obvous drying trend, the temperature showed an obviously increasing trend with the tendency ratio of 0.32℃·10a^-1 to 0.54℃·10a^-1. The warm mutation of the temperature was occured in the end of 1980s to 1990s, the precipitation in the Taohe River Basin was shown a decreasing trend. Among them, the middle reaches and lower reaches was reduced most obvious, the decreasing trend was 13.3 to 21.8 mm·10a^-1. In the Taohe River Basin occurs a obviously warm-drying trend.

Key wordsarid index  Holdridge life zone  warm-drying  Taohe River Basin

文章编号： 0258_7106 (2016) 01_0018_15 中图分类号： P618.41 文献标志码：A

改回日期：2015_07_11

基金项目

**通讯作者耿新霞， 女， 1979年生， 助理研究员， 成矿规律研究方向。 Email： gen gxinxia@cags.ac.cn