Acta Scientiarum Naturalium Universitatis Pekinensis

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Integrated Landscape Ecology Evaluation Based on RS/GIS of Three-Gorge Area

MENG Jijun1,   

  • Received:2004-03-11 Online:2005-03-20 Published:2005-03-20



Abstract: Based on RS and GIS techniques, a integrated evaluation model of eco-environment quality is developed according to Landsat TM images, NOAA/AVHRR data, DEM and eco-environment background of moisture and temperature. Seven indices are selected in the model. They are accumulated temperature greater than 0℃,annual precipitation, altitude, slope, soil erosion, land use and vegetation index. Based on these,the author evaluates the eco-environment quality of Three-Gorges area,which is an ecological fragile region. The results show that (1) the eco-environment quality of Three-Gorges area is not quite good. The eco-environment quality at third,fourth and fifth grade occupies 74.54% of the total area. (2) The horizontal distribution of the eco-environment quality presentes evident regional differences. The eco-environment quality is the best at the end of the reservoir area. That in the beginning of the reservoir area takes the second place and in the middle of the reservoir area,the eco-environment quality is the worst. As far as the administration is concerned, the eco-environment of Yichang City, Changshou County,Chongqing City, Jiangjin County and Yichang County is good. While in Wuxi County, Yunyang County, Fengjie County, Shizhu County, Kai Couty, Wulong County,Wushan County and Wanzhou,the eco-environment is relatively bad. (3) The vertical differences of eco-environment quality are evident. The topography symbolized by slope is the main reason of causing these differences. The eco-environment quality is the worst in the region of middle altitude (500-2000m), which is mainly at fifth and sixth grade. While, in the region of low altitude (<200m), the eco-environment quality is the best. The quality at fifth grade occupies less than 1% of the total area. In the region of high altitude (>2000m),though there are not many impacts of human, the steep terrain makes the eco-environment below fourth grade occupied 27% of the total area.

Key words: remote sensing(RS), geographic information system(GIS), integrated evaluation of eco-environment, spatial pattern, ThreeGorges areay

摘要: 利用2000年Landsat TM影像、NOAA/AVHRR数据、DEM数据及全国生态环境背景水热本底数据,基于RS和GIS技术,选取≥0℃积温、年降水量、海拔、坡度、土壤侵蚀、土地利用与植被指数等7个指标,建立了景观生态综合评价模型,评价了生态脆弱地区——三峡库区景观生态质量,结果表明:(1) 三峡库区景观生态质量表现出3级、4级和5级占主体的特点(74.54%),景观生态质量一般;(2) 景观生态质量水平分布表现出明显的区域差异,呈现出库区尾部最好,头部次之,中间段最差的特点,从行政范围来看,宜昌市、长寿县、重庆市辖区、江津县、宜昌县较好,巫溪县、云阳县、奉节县、石柱县、开县、武隆县、巫山县、万州区等则较差;(3) 景观生态质量垂直分异明显:以坡度为标志的地形起伏是景观生态质量垂直分异的主要原因,中海拔区(500~2000m)以5级和6级所占比例最大,景观生态质量最差;低海拔区(<200m)的景观生态质量最好,5级区只占不到1%;高海拔区(>2000m)虽人为影响不多,但由于坡度比较大,景观生态质量处于4级以下的占27%。

关键词: 遥感, 地理信息系统, 景观生态综合评价, 空间格局, 三峡库区

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