基于Fishnet网格的小流域生态系统健康评价体系构建

Fishnet grid based construction of health evaluation system of Lanlingxi small watershed ecosystem

以三峡库区典型小流域——兰陵溪小流域为例,在遥感影像和野外调查数据的支持下,基于压力-状态-响应模型,通过专家咨询法和层次分析法确定评价指标和权重,运用Fishnet网格法构建小流域生态系统健康评价指标体系和分析模型。结果显示,共筛选出12个相对独立的生态指标,运用生态系统健康综合评价模型,生成了基于Fishnet网格的兰陵溪小流域生态系统健康综合评价等级分布图,能直观反映兰陵溪小流域生态系统健康状况的空间特征。

Quantitatively evaluating the ecological health of a small watershed is a basis of carrying out scientific planning of ecology and formulating scheme of practicable treatment.The small watershed of Lanlingxi was selected as an example and pressure-state-response model was used to systematically study the indicator composition of health assessment system,screening of indicators,determination of weight,processing of grid data,establishment of source database of evaluation indicator,determination of health evaluation model,and health grading based on Fishnet grid.Results showed that the model integrated twelve independent factors into health assessment of ecosystem.The methods could achieve combined application of statistic data and natural data of geographical element,and enhance the accuracy of health assessment of small watershed ecosystem and reflect the differentiation characteristics of health status of assessment units.It will provide theoretical and technical foundation for the health assessment of small watershed ecosystem.