2000-2012年阿拉善盟荒漠化动态

Desertification dynamics in Alxa League over the period of 2000-2012

通过植被盖度指标和Sen氏斜率方法,使用2000-2012年MODIS13Q1-NDVI数据研究发现:近些年阿拉善盟荒漠化问题严重,重度荒漠化土地占比最大,其次是中度荒漠化土地,再次是轻度荒漠化土地,非荒漠化土地极少;额济纳旗的荒漠化问题最为严重,其次是阿拉善左旗,再次是阿拉善右旗;近些年阿拉善盟重度荒漠化土地占比呈下降趋势,中度荒漠化相反,两者相互转换,轻度荒漠化土地占比有所上升,非荒漠化土地占比基本不变,从总体水平上看,阿拉善盟荒漠化问题有所改善;近些年荒漠化加重区域主要分布在额济纳旗和阿拉善左旗,零星地分布在阿拉善右旗,荒漠化加重区域占阿拉善盟土地总面积的20.4%.

Using MODISQ1-N DV I data over the period 2000？2012 based on vegetation coverage indicator and Sen’s estimator, we found： the desertification problem in Alxa League in recent years was pretty grim, which severe desertification land took the large portion, followed by moderate desertification land, again mild desertification and non-desertification land. The desertification problem in Ejina Banner in Alxa League was the most serious, followed by Alxa Left Banner, Alxa Right Banner. The proportion of serve desertification in Alxa League had gone down in recent years, and the moderate desertification was on the contrary. And they were continually in transition with the other in 2000？2012. The proportion of mild desertification increased slightly, and non-desertification was basically unchanged. In general, the desertification problem in Alxa League was slightly getting better. The hot spots of land degradation shared 20.4% of Alxa League. There was the desertification land most in Ejina Banner and Alxa Left Banner, followed by Alxa Right Banner.