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首页> 外文期刊>International Journal of Environmental Research and Public Health >Regionalizing Aquatic Ecosystems Based on the River Subbasin Taxonomy Concept and Spatial Clustering Techniques
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Regionalizing Aquatic Ecosystems Based on the River Subbasin Taxonomy Concept and Spatial Clustering Techniques

机译：基于河流流域分类学概念和空间聚类技术的水生生态系统区域化

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Aquatic ecoregions were increasingly used as spatial units for aquatic ecosystem management at the watershed scale. In this paper, the principle of including land area, comprehensiveness and dominance, conjugation and hierarchy were selected as regionalizing principles. Elevation and drainage density were selected as the regionalizing indicators for the delineation of level I aquatic ecoregions, and percent of construction land area, percent of cultivated land area, soil type and slope for the level II. Under the support of GIS technology, the spatial distribution maps of the two indicators for level I and the four indicators for level II aquatic ecoregion delineation were generated from the raster data based on the 1,107 subwatersheds. River subbasin taxonomy concept, two-step spatial clustering analysis approach and manual-assisted method were used to regionalize aquatic ecosystems in the Taihu Lake watershed. Then the Taihu Lake watershed was divided into two level I aquatic ecoregions, including Ecoregion I1 and Ecoregion I2, and five level II aquatic subecoregions, including Subecoregion II11, Subecoregion II12, Subecoregion II21, Subecoregion II22 and Subecoregion II23. Moreover, the characteristics of the two level I aquatic ecoregions and five level II aquatic subecoregions in the Taihu Lake watershed were summarized, showing that there were significant differences in topography, socio-economic development, water quality and aquatic ecology, etc. The results of quantitative comparison of aquatic life also indicated that the dominant species of fish, benthic density, biomass, dominant species, Shannon-Wiener diversity index, Margalef species richness index, Pielou evenness index and ecological dominance showed great spatial variability between the two level I aquatic ecoregions and five level II aquatic subecoregions. It reflected the spatial heterogeneities and the uneven natures of aquatic ecosystems in the Taihu Lake watershed.
机译：在分水岭范围内，水生生态区被越来越多地用作水生生态系统管理的空间单位。本文选择了包括土地面积，全面性和优势性，共轭性和等级性在内的原则作为区域化原则。选择高程和排水密度作为I级水生生态区，II级建设用地面积百分比，耕地面积百分比，土壤类型和坡度的区域划分指标。在GIS技术的支持下，根据1107个小流域的栅格数据生成了I级两个指标和II级四个水生生态区划定指标的空间分布图。运用河流次流域分类学概念，两步空间聚类分析方法和人工辅助方法对太湖流域水生生态系统进行分区。然后将太湖流域划分为两个I级水生生态区，包括I1区和I2区，以及5个II级水生生态区，包括Subecoregion II11，Subecoregion II12，Subecoregion II21，Subecoregion II22和Subecoregion II23。此外，总结了太湖流域的两个一级水生生态区和五个二级水生生态区的特征，表明在地形，社会经济发展，水质和水生生态等方面存在显着差异。水生生物的定量比较还表明，鱼类的主要种类，底栖密度，生物量，主要种类，香农-维纳多样性指数，Margalef物种丰富度指数，Pielou均匀度指数和生态优势在两个一级水生生态区之间显示出很大的空间变异性。和五个II级水生亚生态区。它反映了太湖流域的空间异质性和水生生态系统的不均匀性。

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