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首页> 外文会议>Geoscience and Remote Sensing Symposium, 2005. IGARSS '05. Proceedings. 2005 IEEE International >Study on the dynamic changes of land desertification in Yulin Prefecture, northwestern China based on RS and GIS
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Study on the dynamic changes of land desertification in Yulin Prefecture, northwestern China based on RS and GIS

机译：基于RS和GIS的西北榆林地区土地沙漠化动态变化研究。

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摘要

With taking many measures of combating land desertification in the past decades, the distinct effects have been achieved in Yulin Prefecture of Shaanxi Province in northwestern China. The objective of this study was to monitor and analyze the dynamic changes of desertification in the regions in the 14 years from 1986 to 2000 using remote sensing and geographic information system (GIS), so as to derive the useful references for the restraining land desertification and the further fathering sandy land in the future. According to the surface landscape indices, the sandy land was divided into four types, such as shifting sandy land, semi-shifting sandy land, semi-fixed sandy land and fixed sandy land, and the desertified land had been divided into light level desertified, moderate level desertified, severe level desertified and heavily level desertified corresponding. The data of sandy land in these two dates were interpreted and obtained by interpreting the images of TM in 1986 and 2000 with the visually interactive interpretation. The data of dynamic changes of reversing from sandy land and desertified land were obtained by overlaying databases in these two periods. The study results show that there was 29,523 ha of newly deserified land occurred, and most of the newly desertified lands are heavily severe desertified grades. At the same time, 104,896 ha of desertified land were rehabilitated. As a result, the desertified decreased by 75,373ha kept a stable reversed situation as a whole during the 14-year periods.
机译：在过去的几十年中，采取了许多防治土地荒漠化的措施，在中国西北部的陕西省榆林州取得了明显的成效。这项研究的目的是使用遥感和地理信息系统（GIS）监测和分析1986年至2000年这14年间该地区荒漠化的动态变化，从而为抑制土地荒漠化和荒漠化提供有用的参考。将来会进一步育成沙地。根据地表景观指数，将沙地分为流沙地，半流沙地，半固定沙地和固定沙地四种类型，将荒漠化土地分为轻度荒漠化，中度荒漠化，重度荒漠化和重度荒漠化相对应。通过对1986年和2000年TM的图像进行图像交互解释，解释并获得了这两个时期的沙地数据。通过覆盖这两个时期的数据库，获得了沙地和荒漠化土地逆转的动态变化数据。研究结果表明，新近发生荒漠化的土地有29523公顷，大部分新近荒漠化的土地属于严重荒漠化等级。同时，修复了104,896公顷的荒漠化土地。结果，荒漠化减少了75,373公顷，在14年期间总体上保持了稳定的逆转态势。

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