锡林郭勒盟气候干燥度的时空变化规律

以锡林郭勒盟15个气象站点1981—2007年的月平均气温、月累积降水量数据为基础,在Arcgis软件的支持下,得到DeMartonne干燥度的空间数据。研究结果表明,锡林郭勒盟27a平均干燥程度自东向西递增;1981—2007年,锡林郭勒盟整体上表现出干燥度数值下降、干旱程度上升的趋势;从干燥度的年代,20世纪80年代和90年代是锡林郭勒盟气候相对湿润时期,21世纪初期,锡林郭勒盟大部分地区的气候呈现干燥度值减小、干燥程度加大的趋势,干性干旱区在空间分布上占据了主导地位,结果也打乱了原有的气候带状交替格局。21世纪初与20世纪80年代相比,各干燥度等值线的位置均发生了明显的东移现象。

The analysis on the spatial-temporal change of climate aridity in Xilinguole Steppe

1980's,the serious arid area with dryness index below 10 didn' t exist in Xilinguole League.The dominant climate zone was the moderate arid one which accounted for 40.63% of the total area,at the same time,wet arid zone made up nearly 20% of its total;Into the 90's,dry and moderate arid areas slightly reduced,but wet arid areas increased to 21.58% and the drought wet areas took up 11.90% ;The early 21st century,the climate for most parts of Xilinguole League showed a general tendency with Idm value declinin...