基于MODIS的北京绿化隔离地区植被格局与趋势分析  

Pattern and Trend Analysis of the Isolated Afforestation Regions in Beijing Using MODIS

作　　者：孙晓鹏[1] 王天明[1] 葛剑平[1] 

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,生命科学学院,北京100875

出　　处：《地理与地理信息科学》2012年第6期20-23,F0002,共5页Geography and Geo-Information Science

基　　金：北京市教育委员会科学研究与科研基地建设项目(2011);北京市科技计划课题(Z100008000410018)

摘　　要：营造绿化隔离地区是限制城市无序扩展和改善景观环境的有效手段。利用MODIS-NDVI数据,采取景观格局分析和趋势分析方法,探讨了北京两道绿化隔离地区2000-2010年的植被变化。结果表明:一道绿隔内NDVI低值斑块占主导,但不断向NDVI高值斑块转化并被分割,斑块连接度(CONNECT)和斑块结合度(COHESION)也在不断减小,二道绿隔则与此相反;一道绿隔NDVI显著增加的像元占40.5%,仅有3.8%的像元NDVI显著减小,二道绿隔NDVI显著增加与显著减小的像元比例相当,分别为18.1%和15.6%。两道绿隔的植被变化由不同的城镇化水平引起:一道绿隔土地利用过程稳定,植被增加明显,建成区连接成片的现象得到很大改善;而二道绿隔范围广,城镇化进程与植被建设过程相互交错,植被总体分割和局部改善并存。It is a limitation of the urban disorderly extension and an effective improvement of landscape and environment to construct isolated afforestation regions. MODIS-NDVI data was used to analyze the vegetation patterns and trends in the two isolated afforestation regions in Beijing from 2000 to 2010. The main results are as follows： NDVI low-value patches were dominant in the first isolated afforestation region. These patches were changed into NDVI high-value ones and isolated by them,and their Connectance Index （CONNECT） and Patch Cohesion Index （COHESION） decreased constantly. The situation was contrary in the second isolated afforestation region. The 40. 5% pixels had positive NDVI trends and only 3. 8% pixels had negative NDVI trends in the first isolated afforestation region. But in the second isolated afforestation region, the percent of the positive trend pixels was 18. 1 %, near the negative trend ones, 15. 6 %. The vegetation changes were caused by the different urbanization levels in the two regions. There were stabile land use process and obvious vegetation increase in the first isolated afforestation region, which changed the phenomenon of the joint built-up areas. However, urbanization and vegetation construction coexisted, and the vegetation was divided in the mass and improved partially in the second isolated afforestation region.

关 键 词：绿化隔离地区 植被 北京 MODIS-NDVI 

分 类 号：Q948[生物学—植物学]