标题：Remote Sensing Monitoring of the Dynamic Changes of Vegetation Coverage and Its Types Before and After the Emergent Water Transportation yo the Lower Reaches of the Tarim River
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B7
页码：863-870
出版社：Copernicus Publications
摘要：Two factors of the vegetation coverage and its types sensible to the ecological changes before and after the Emergent Water Transportation Project are investigated based on three periods of the multi-source and multi-type remote sensing (RS) images such as TM image, ETM image and ASTER image collected from the summer of 1999, 2002 and 2004, respectively, together with the basic geographic data and the special data in the target research. The framework of system classification, conversion model building, remote sensing extraction and interpretation are opted to be used as well as field investigation and databases warehouse building technology, t he theory of the integrative spatial and attribute data and seamless integration of multi-source data. The gathered data are reclassified, stored and managed in the respective databases for further repetitive extraction and verified analyses. The vegetation coverage and its types, on the ground of geographic information system (GIS) technology and the groundwater levels during the real-time monitoring, are calculated through the mathematic statistic method, and analyzed in a qualitative and quantitative way. The potential vegetation coverage is categorized into four classes: poor, lower, moderate and satisfactory, respectively, and then extracted and examined. The vegetation types are interpreted and separated into four classes: waste grassland，farm land, forest land, reed field. The research indicates that: (1) The moderate and satisfactory coverage of vegetation evidently go up in area by 1.68 x10 3 hm 2 , 9.09 x10 3 hm 2 respectively. The poor, lower vegetation coverage areas constantly fall into decline by 7.83 x10 3 hm 2 , and 9.99 x10 3 hm 2 on the average from 1999 to 2004 respectively, and some turn for worse is prevented and stopped in some area. (2) The farm land increases from 1.48x10 4 hm 2 in area in 1999 to 1.51x10 4 hm 2 in area in 2002, and then to 1.72x10 4 hm 2 in area in 2004 with a yearly increasing ratio of 3.52%. (3) To be concluded, the emergent water supply plays a decisive and significant role in promoting the ecological environment in the research region. But there is a long way to rejuvenate the whole Green Corridor and turn the extremely fragile ecological environment in the lower reaches of the Tarim River as a whole on a large scale
