龙羊峡库区天然草地动态分析

Dynamic analysis on the natural pasture in Longyang reservoir region

利用美国陆地卫星T M图象,对龙羊峡水库库区的天然草地进行了对比分析,结果表明:天然草地面积减少7084 09hm2,其中减幅较大的为温性草原类和温性荒漠类,10年中分别减少了7299 27hm2和1015 65hm2。另外,草地盖度、牧草高度和草地产量也有下降,其中草地盖度下降5%～15%;牧草种数减少4～20种;牧草产量下降73 5～1090 05kg/hm2。并对变化原因作了分析,提出了治理措施。

A comparative analysis was conducted on the dynamics of natural pasture in Longyang reservoir region based on the US TM imagine,the results ares follow: the total area of natural pasture reduced 7 29927hm2 in the past 10 years,mainly of the temperate steppe (7 08409 hm2)and temperate desert(1 01565 hm2)Meanwhile the vegetation coverage and yields reduced by 5%～15% and 735～1 09505 kg/hm2 respectivelyspecies number also reduced 4～20 times