内蒙古浑善达克沙地南部草地盖度探测及其变化分析

Detection of Vegetation Coverage and Their Dynamic Changes of Otindag Sandy Land in Inner Mongolia

陆地生态系统植被覆盖程度是评价区域生态环境变化的重要因子。以内蒙古浑善达克沙地南部(锡林郭勒盟正蓝旗北部地区)为研究区,应用中国环境与灾害监测预报小卫星数据HJ-1ACCD及美国陆地卫星数据Landsat TM,分别基于像元二分模型和三波段梯度差模型、使用NDVI和RDVI等参数,对研究区草地植被覆盖度进行了探测,并对比了不同模型方法和参数所得研究区草地植被盖度成果的分类精度。研究结果表明,基于像元二分模型和RDVI参数探测植被盖度的方法表现最好;以此为基础,进一步分析了研究区2000～2009年区域植被覆盖度动态变化,发现本地区在2000年之后草地覆盖改善区面积超过草地盖度下降区面积,浑善达克沙地南缘植被恢复状况总体较好。

The vegetation cover is an important factor to evaluate the regional ecological environment in the terrestrial ecosystem.In this study,we detected the vegetation coverage,using Chinese Environment and Disaster Monitoring and Forecasting Satellite（HJ-1A CCD） and Landsat TM data,applying the models of Gradient Difference by Three-band modol and Fraction Dimidiate Pixel Model with parameters of NDVI and RDVI.Through comparing the accuracy of the classification results respectively by different models and different paraments,we discovered that the Fraction Dimidiate Pixel Model with RDVI got the best effect.In view of this,we analyzed the dynamic changes of the vegetation coverage between 2000~2009 in the study area,then pointed out that the vegetation recover is well.