近20年成都市植被覆盖度动态变化检测及原因分析  

Dynamic Supervision and Reason Analysis of Vegetation Coverage Changes of Chengdu in the Past 20 years

作　　者：党青[1] 杨武年[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]成都理工大学国土资源信息技术与应用国土资源部重点实验室/遥感与GIS研究所,成都610059

出　　处：《国土资源遥感》2011年第4期121-125,共5页Remote Sensing for Land & Resources

基　　金：地质灾害防治与地质环境保护国家重点实验室"科技减灾;重建家园"开放研究基金项目(编号:DZKJ-0806)资助

摘　　要：利用1992年2、001年和2009年的TM遥感数据,采用归一化差值植被指数(NDVI)和像元二分法模型得到成都市植被覆盖度变化灰度图及变化等级图,从而客观、定量地得出了近20 a来植被覆盖度的变化状况,对于成都市制订调节气候、恢复植被、预防自然灾害等城市发展规划具有实际意义。数据分析结果表明1,992—2009年间,成都市植被覆盖度呈整体下降趋势,密林地,灌木林地,高、中产草地和耕地数量减少,其中1992—2001年植被覆盖度下降速度显著;2001—2009年植被覆盖度仍有所降低但下降速度较1992—2001年明显减缓,且城区出现斑点状分布的人工绿地,小局域气候状况在不断改善中。Using 1992,2001 and 2009 TM remote sensing data,the authors estimated the vegetation coverage change status of Chengdu in the past 20 years objectively and quantitatively.The study has practical significance for adjusting the climate,resuming the vegetation and preventing the natural disasters.Normalized difference value vegetation index（NDVI） was used to estimate the vegetation coverage in different periods and draw the change grayness and change levels chart of Chengdu vegetation coverage.Data analysis results show that,from 1992 to 2009,the vegetation coverage in Chengdu was overall decreasing.The quantity of dense forest land,shrub land,high and middle grass and cultivated land was decreasing,in which the vegetation coverage decreased obviously from 1992 to 2001,the vegetation coverage remained reduced from 2001 to 2009,but the speed was slower than that from 1992 to 2001.In addition,the speckle distribution of artificial greenbelt appeared in the urban area,and the small-area climatic condition was improved continuously.

关 键 词：植被覆盖度 归一化差值植被指数 动态变化 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]