以遥感影像资料为依据,运用地学信息图谱研究方法,在RS和GIS的支持下分析榆阳区1985~2000年土地利用及其生态服务价值的时空变化特征。结果表明:该区研究期内最主要的土地利用动态是未利用地向草地的转化,其变化占全区总变动量91.14%;土地利用变化使生态系统的生态服务价值增加了158.59×106元,增幅为8.23%,其中,风沙区占总增量的85.99%,增幅10.88%,黄土丘陵沟壑区占总增量14.01%,增幅3.29%。经过实证分析,利用地学信息图谱进行土地利用变化和生态效应定量研究是一种十分有效的方法。
Based on the remote sensing data, by using the theory of geographic information images and supported by RS and GIS, the land use/cover change (LUCC) images and the ecosystem services value (ESV) change images about Yuyang District during 1985-2000 were constructed. According to the research of above change images, the character of land use change and its ecological effects in research area were analyzed.The results show that the area of unused land decreased, while the area of rangeland, farmland, construction land, forestland and waters increased from 1985 to 2000, and the increased area of rangeland was the most. The most land use changes was the transformation from unused land to rangeland, whose area was 91.14% of the total changes. The change of land use resulted in the ESV of the research area increased from 1927.34?106 yuan (RMB) in 1985 to 2085.93?106 yuan in 2000, which was up 8.23%. There was 85.99% of the total increased ESV in wind drift sand region where the ESV grew 10.88%, but there was only 14.01% of the total increased ESV in loess hilly-gully region where its ESV raised 3.29%. By the empirical analysis, the way of geographic image was a very effective method in analyzing land use change and ecological effects.
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