基于P-S-R模型的大沽河流域综合生态承载力时空分异研究

Study on Spatial and Temporal Differentiation of Comprehensive Ecological Carrying Capacity in Dagu River Basin based on P-S-R Model

文章运用P-S-R模型,构建流域地区生态承载力评价指标体系,对大沽河流域生态承载力进行综合分析。结果表明:(1)在3个准则层中,20年间流域内压力、响应指数在空间上呈现从北向南递增的趋势,状态指数呈波动上升的趋势。(2)流域内生态承载力总体呈下降趋势且处于承载力较弱状态,但时间上具有差异性,其中以2010年为界,呈先降低后升高的变化趋势。(3)大沽河流域生态承载力空间分布差异显著,整体来看,流域从发源地到入海口区域生态承载力呈现上升趋势。

Based on the P-S-R Model,the ecological carrying capacity evaluation index system of Dagu River Basin was established to comprehensively analyze the ecological carrying capacity.The results show that:(1)In the three criteria layers,the pressure and response indices in the basin have an increasing trend from north to south,and the state indices have a rising trend of fluctuation.(2)The overall ecological carrying capacity of the basin showed a declining trend and was weak,but there was a difference in time.The ecological carrying capacity decreased first and then increased in 2010.(3)The spatial distribution of ecological carrying capacity of Dagu River Basin was significantly different.On the whole,the ecological carrying capacity of Dagu River Basin showed an upward trend from the birthplace to the estuary.