中文摘要：

本文研究了川西南山地安宁河流域干热河谷和干性森林的水分收支状况。结果表明：（1）干热河谷和干性森林的年降水量分别为1 067.95 mm和1 371.73 mm,年降水量的90%以上集中在6月～10月的雨季和夏秋季节;（2）干热河谷和干性森林年蒸发量为1 280 mm和1 089.75 mm,春夏蒸发占年蒸发量的65%和66%,旱季蒸发占年蒸发量的58%和61%,4月～6月是蒸发旺季,其次是7月～8月;（3）干热河谷和干性森林年水分盈余量分别为43.6 mm和481.95 mm,均存在季节性水分匮缺期,7月～10月、夏秋季节和雨季均是水分盈余期,其余为水分匮缺期;（4）干热河谷和干性森林年干燥度分别为1.205和0.8,表明该地区分别为半湿润和湿润性气候,还存在明显的季节差异,7月～10月、雨季和夏秋季节气候湿润,其余时期为半湿润或干旱气候;（5）干性森林在年降水量和水分盈余量上高于干热河谷,在年可能蒸发量和干燥度上明显低于干热河谷,这种差异还体现在水分参数的月分配、四季分配、旱雨季分配上;（6）干热河谷湿润程度差于干性森林,干热河谷植被和干性森林对各自水分收支状况具有良好的适应性;（7）封山育林需要注意旱季防火,人工促进还需要考虑土壤水分平衡规律和适地适树,进行“适度”造林。

英文摘要：

In this paper, researches are conducted on the seasonal features of moisture income ano outcome in the dry-hot valleys and the dry forest in the Arming River watershed in the mountainous area of Southwest Sichuan. The results have shown as follows ： （ 1 ） precipitation is respectively 1 067.95 mm and 1 371.73 mm in the dry-hot valleys and the dry forest, in which more than 90% of annual precipitation occurs in rainy period between June and October and in summer and autumn ; （2） The amounts of e- vaporation are 1 280 mm and 1 089.75 mm in the dry-hot valley and the dry forest, the evaporating periods are mainly from April to June, and secondly from July to August and more than 60% of evaporation happens in spring and summer and near 60% in the dry season; （3） The annual moisture surpluses axe 43.6 mm and 481.95 mm in the dry-hot valley and the dry forest respectively, but the periods from July to October, summer,autumn and rainy season are the periods of moisture surplus, and other periods are the deficit periods ; （4） The annual aridity is respectively 1. 205 and 0. 8, implying that the dry-hot valleys have a quasi-moisture climate and the dry forest has a moisture climate, but there are some seasonal differences, namely ,the moisture climate is from July to October, in rainy period, summer and autumn, and the quasi-moisture and dry climate are in other periods; （5） The annual precipitation and moisture surpluses the dry forest are higher and the annual probable evaporation and aridity in the dry-hot valleys are obviously higher, and these differences are also found in the monthly distributions, seasonal distributions and dry and rainy distributions; （6） The moisture degree in the dry-hot valleys is lower than that in the dry forest, and the vegetation of dry-hot valleys and dry forest are well adapted for this kind of mois- ture income and outcome condition; （7） The fire prevention should be emphasized in the dry season during the closing land for plantation, and the soil moisture b