巴里坤绿洲1961-2006年湿润指数变化

地表湿润指数能较客观地反映某一地区的水热平衡状况，是判断某一地区气候干旱与湿润状况的良好指标。通过计算巴里坤1960--2006年逐旬的地表湿润指数，得出：（1）巴里坤历年月平均湿润指数介于0．2与0．5之间，较为干旱，尤其是在植物生长季节，湿润指数较低。对当地农作物和牧草的生长发育造成一定影响；（2）自90年代以来，该区气温和降水增幅明显增大，但湿润指数却呈现逐渐减小的趋势，表明该区域干旱程度随着气温的升高在逐渐加大，增温效应大于降水效应；（3）湿润指数时间分布不均，春夏季较低，秋冬季较高；（4）湿润指数可以作为反映生态环境变化的指标，为科学合理的进行生态环境变化监测提供服务。

The Change of Ground Humidity Index in 1960-2006 in Balikun Oasis

The Earth＇s surface humidity index is able to objectively reflect the conditions of waterheat balance, and a fine indicator to judge aridity or wetness of the climate in a certain area. To compute the Earth＇s surface humidity of every ten days from 1960 to 2006, we draw the conclusion as follows： （1） The mean monthly humidity index in Balikun is quite drought to lie between 0.2- 0.5, and in the plant growth season, especially, the low humidity index has a certain influence to the growth of the local farm crop and pasture. （2） The temperature and precipitation in Balikun were increased obviously since 1990s, but on the contrary, the humidity index was gradually decreased; and it indicated that the drought degree was increased with the increasing temperature; the effect of temperature was bigger than the effect of precipitation. （3） The space-time distribution of humidity index was asymmetry, spring and summer to be lower, autumn and winter to be higher. （4） The Earth＇s surface humidity index can be an indicator to reflect the change of entironment, and can offer the service to monitor the entironment change scientifically and reasonably.