塔里木河下游沙漠化土地时空变化遥感分析  

Remote sensing analysis of spatial-temporal changes of desertification land in Lower Reaches of Tarim River

作　　者：张建生[1] 闫正龙[2] 王晓国[2] 黄强[1] 高凡[1] 

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]国家测绘局陕西基础地理信息中心,西安710054

出　　处：《农业工程学报》2009年第10期161-165,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50679070)

摘　　要：为对应急输水工程实施前后塔里木河下游地区沙漠化土地的变化状况进行监测,选择研究区1999年TM、2002年ETM+和2004年ASTER遥感影像及基础地理数据,通过沙漠化土地分类体系划分、信息提取模型构建及动态变化类型建立等方法,对研究区沙漠化土地的时空变化趋势进行了定性定量分析。结果表明:应急输水工程实施后,研究区内非、轻沙漠化面积逐年增加,分别由1999年的14768.33、153261.03hm2增加至2004年的19994.23、159953.76hm2;中度沙漠化面积年均减少2981.58hm2;强度沙漠化面积仅增加1.07hm2。研究期间,部分沙漠化土地发生了较为明显的逆转,土地持续退化局面有所遏制和缓解,但由于来水量有限及采用线性输水等原因,远离河道区域的生态环境依然恶劣,流域整体生态环境仍不容乐观。The respective data of TM, ETM^＋ and ASTER in1999, 2002 and 2004 and together with the basic geographic data in the Lower Reaches of Tarim River were monitored, collected and analyzed in qualitative and quantitative way before and after the emergent water project in the Lower Reaches of Tarim River. Classifying the desertification land, modeling the target information extraction and establishing the dynamic change patterns, the spatial-temporal changing trend of desertification land in the study area showed that the none and weak desertification area increased from 14 768.33, 153 261.03 hm^2 in 1999 to 19 994.23, 159 953.76 hm^2 in 2004, respectively. The moderate desertification area decreased by 2 981.58 hm^2 on average annual, and the severe desertification area went up only by 1.07 hm^2. During the period of research, some desertification lands were evidently reversed and in turn the continuing trend of land degeneration was partly stopped and alleviated. The ecological environment far away from the river bed, however, was still bad and severe, and the entire ecological environment of the river basin was less optimistic because of the limited water inflow coming from the emergency water project as well as the linear water delivery.

关 键 词：土地 遥感 监测 时空变化 沙漠化 塔里木河下游 应急输水 

分 类 号：S126[农业科学—农业基础科学] TP79[自动化与计算机技术—检测技术与自动化装置]