Analysis of ecological carrying capacity in Songjiang,Shanghai,by establishing the Pressure-State-Response model
This study established a"Pressure-State-Response,PSR"model in Songjiang,Shanghai.The PSR model incorporated 59 indexes and the data were collected from the local Statistical Year Book(2016-2022)and Environmental Quality Reports(2016-2022).The weights of 59 indexes were estimated by using Analytic hierarchy process(AHP).In order to eliminate the influences from the units and ranges of the indexes,each of the 59 indexes was standardized by subtracting the mean and dividing by the stand deviation.The results showed that:1)The ecological pressure was relieved from 2016 to 2022,resulting from the reduction of pollutant discharge and moderate increase of population size.2)The ecological elastic degree was increased from 2016 to 2022 due to the investments on the ecological resources,the pollution treatments and the economic development.3)The ecological carrying capacity of Songjiang was increased and the response component of PSR,namely the environment quality,was increased.4)The negative correlation coefficient between ecological pressure and PSR response suggests the primary role of ecological pressure on determining the environment quality.
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