基于GIS的长江三峡水库消落带生态类型划分及其特征.PDF

生态学杂志ChineseJournal of Ecology摇 2012,31(8):2082-2090 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 基基于GIS 的长江三峡水库消落带生态类型 划分及其特征* ** 雷摇 波摇 杨春华摇 杨三明 摇 周摇 玉摇 张摇 晟摇 王业春 (重庆市环境科学研究院,重庆401147) 摘摇 要摇 利用GIS技术,以水位高程变化、库岸坡度和小尺度地形地貌特征为依据,在数字 地形图上,制作水位高程鄄坡度图和小尺度地形地貌图,通过图形叠加分析,对长江三峡水 库消落带进行生态类型划分。 结果表明:三峡水库消落带生态类型可划分为经常性水淹型 (缓坡型、陡坡型)、半淹半露型(缓坡型、陡坡型)、经常性出露型(缓坡型、陡坡型)、岛屿型 (常淹型、出露型)、湖盆鄄河口鄄库湾鄄库尾型(湖盆型、河口型、库湾型、库尾型)、峡谷型等6 大类12 个亚类;半淹半露型、经常性出露型和湖盆鄄河口鄄库湾鄄库尾型,占消落带总面积的 82.2%,应以人工生态修复为主、自然恢复为辅;而经常性水淹型、岛屿型和峡谷型占 17郾8%,应以自然恢复为主、人工生态修复为辅。 关键词摇 GIS;长江三峡水库;水位高程;库岸坡度;小尺度地形地貌 中图分类号摇 X171.1摇 文献标识码摇 A摇 文章编号摇 1000-4890(2012)8-2082-09 GIS鄄based division of ecological types and their characteristics of water鄄level鄄fluctuating zone in the ThreeGorgesReservoirofYangtzeRiver. LEIBo,YANGChun鄄hua,YANGSan鄄 ** ming ,ZHOU Yu,ZHANG Sheng,WANG Ye鄄chun (Chongqing Academy of Environmental Science,Chongqing 401147,China).Chinese Journal of Ecology,2012,31(8):2082-2090. Abstract:By using GIStechnology,andtakingwaterlevel change,bank slopeof reservoir,and small scale geomorphology as the environmental evaluation indicators,the water level elevation鄄 slope and spatial geo鄄morphological maps of the Three Gorges Reservoir were drawn,based on the digital topographic map,and,through overlay analysis,the ecological types of water鄄level鄄 fluctuating zone (WLFZ)inthe Reservoirwere classed. The ecological typesof theWLFZ could be classified into 6 classes and 12 subclasses, including perennial submerged WLFZ (gentle slope and steep slope),periodic submerged WLFZ (gentle slope and steep slope),perennial