Quantifying Assessment Of Urban Ecosystem Services Flow Of Beijing Based On Entropy Theory

Quantitative evaluation of ecosystem service can provide scientific theories,while also essential precondition of rational exploitation of ecological resources for sustainable development.The study of ecosystem services flow providing a scientific method to quantity ecosystem services.This paper built an assessment indicator system based on land cover/land use and four types of ecosystem services or functions according to previous researches.The types of ecosystem services flow were reclassified.By introducing entropy theory,disorder degree and developing trend of indicators and urban ecosystem were assessed quantitatively.Beijing was chosen as the study area,and twenty-four indicators were selected for evaluation.The results showed that entropy value of Beijing urban ecosystem during 2004 to 2015 shown a large disorder degree and the close to verge of non-health.The system got maximum value for three times,while the mean annual variation of the system entropy value increased gradually in three periods,which identify that human activity caused negative effects on urban ecosystem.Entropy flow reached minimum value in 2007,which means quality of ecological environment was the best in the meantime.The determination coefficient of the fitting function of total resident population in Beijing and urban ecosystem entropy flow reach a high value,which indicates that urban ecosystem healthy condition is highly correlated with total resident population.Then serve entropy flow as the link of urban natural ecosystem and social-economic system,exploring correlation of anthropogenic heat emission,variation of urban air temperature and ecosystem services flow based on the background of population increasing and try to provide theoretical foundation for city development and peri-urban nature reserve planning or management.