江河源区生态环境质量综合评价

在青海省土地资源详查数据以及土地利用现状图、土地利用分区图的基础上,借助G IS技术从生物丰度、植被覆盖度、水网密度、土地退化和污染负荷5个方面对江河源区生态环境质量进行了综合分析与评价。结果表明,江河源区生态环境质量状况总体偏差,综合评价指数处于差和较差的区域面积占江河源区总面积的83.3%;在空间分布上,江河源区生态环境质量从东南部到中西部呈现出明显的地带性,生态环境质量较差的行政区县(乡)主要集中于江河源区的中西部,而江河源区东南部部分行政区县生态环境质量相对较好。

Synthetical evaluation of eco-environmental quality in the headstream of Yellow,Yangtze and Lantsang Rivers

Based on the detailed survey of land use and current Land use map of Qinghai Province,the eco-environrnental quality in the headstream of Yellow River, Yangtze River and Lantsang River was evaluated synthetically, including organism abundance index, vegetation cover index, rivers density index, land deterioration index and pollution load index. The results showed the whole eco-environmental quality in the headstream of Yellow River,Yangtze River and I.antsang River was grouped into the lower class,and there was 83.3% of the whole land area getting worse or the worst in EQI. And the ecological environmental quality appeared conspicuously zonal in spatial distribution from southeast to Midwest,that is to say,the EQI in Midwest was relatively poor,while the EQI of some counties in the southeast indicated better quality.