Taking the monthly total precipitation, monthly average temperatures and relative humidity of 4 weather stations in pasturing areas of Hulun Buir city from 1971 to 2005 as statistics, its spatial and temporal distribution, inter annual change of the dry wet conditions were analyzed. The results showed that surface moisture loss area in spring, summer and autumn of pasturing areas in Hulun Buir city were expanding,and the drying trend were reinforced. The humid index and moisture profit and loss of 4 weather stations were different. Pasturing area were drier than the other regions, moisture loss had affected the production of pasturing area severely. Thumid index was decreasing, the surface was drying. It was concluded that drying trend of pasturing areas in Hulun Buir city might relate to the decreasing of precipitation and the increasing of temperature.%利用1971～2005年内蒙古东北部呼伦贝尔市牧区4个站的月降水量、月平均气温和相对湿度资料,分析其地表干湿状况的时空分布和年际变化特征.结果表明:1971～2005年呼伦贝尔市牧区春夏秋(冬季除外)季地表水分亏损面积在扩大,干旱化趋势加剧;牧区各站地表湿润指数和水分盈亏有差异,相对于全市其他地区而言,牧区比较干燥,水分亏损严重,这已严重影响牧区生产;牧区地表湿润指数呈减小趋势,地表趋于变干.由此推测,呼伦贝尔市牧区地表逐渐变干可能与降水量减少和气温的逐渐升高有关.
展开▼
