基于遥感与GIS技术的呼和塔拉万亩草原植被覆盖度动态变化监测

Monitor The Vegetation Coverage Change of Huhetara Thousand Mu Grassland Based on Remote Sensing and GIS Technologies

以呼和塔拉万亩草原为研究区,选用2001、2010、2013、2016四期TM遥感影像提取归一化植被指数(NDVI),将NDVI结果输入到像元二分模型中计算得到研究区各时期植被覆盖度,然后将植被覆盖度划分为6个等级,最后计算覆盖度差值并结合各级覆盖度转移矩阵,分析了万亩草原生态修复前后的植被覆盖度动态变化特征。结果表明,生态修复之前2001、2010年植被覆盖度主要以0-30%为主;在生态修复之后的2013、2016年植被覆盖度显著增加,主要以45-100%为主,2013年植被覆盖度45-100%的面积为11352亩,占总面积71.62%,2016年植被覆盖度45-100%的面积为14563亩,占总面积91.88%,说明植被生长情况明显好转。

We selected Huhetara Ten Thousand mu Grassland as research region firstly,then normalized difference vegetation index（NDVI）through the TM remote sensing image during four periods which are 2001,2010,2013 and 2016.Secondly,we input the result of NDVI into the dimidiate pixel model to calculate the vegetation coverage of every research region in every period.Thirdly,we divided the vegetation coverage into 6 parts to calculate the deference vegetation index.Finally,we analyse the characters of the vegetation coverage dynamic change of Huhetara Ten Thousand mu Grassland before and after Ecological Restoration by uniting transition matrix of coverage at different levels.The result shows that the vegetation coverage is mainly from 0 to 30% before ecological restoration which between 2001 and 2010.Vegetion coverage increased significantly in 2013 and 2016 after ecological restoration.It mainly focuses on 45-100%.In 2013,the area of vegetation coverage is 45-100%.convering an area of 11352 mu.accounted for 71.62% of the total area.In 2016,the area of vegetation coverage is45-100%.convering an area of 14563 mu.accounted for 91.88% of the total area.The growth of vegetation was obviously improved.