DRIVERS OF EFFLUENT SEWAGE AND DECOUPLING EFFECT IN JIANGSU PROVINCE:BASED ON STIRPAT MODEl AND OECD DECOUPLING INDEX

Jiang Huifeng;Changzhou Institute of Technology;

effluent sewage;;STIRPAT model;;Partial Least Square Regression;;decoupling

Despite the scientific consensus that humans have dramatically altered the water environment,we know little about the specific forces driving those impacts and how they affected because of the absence of a refined analytic tools. As a stochastic model,STIRPAT can be used to compute the ecological elasticity of population,affluence and other factors,however,it is inevitable that there will be multiple co linearity among the various influencing factors,and partial least squares can be adopted to reduce problems with co- linearity of the model. Results showed that the pressure of anthropogenic activities on water resources mainly reflected in the aspects of the population and industrial structure. Quantity of waste water effluent was growing faster than population growth and percent of GDP,which made great pressure to water resources. Suitable reduction of water use could reduce discharge of waste water from the source. Through the analysis of the decoupling relationship between economic development and water resources consumption in Jiangsu province by OECD decoupling index,it showed that water consumption per unit of output decreased year by year. " Relative decoupling" relationship predominated,followed by " absolute decoupling" relationship,other types of relationships rarely tended to be " decoupled",but it did not reach the ideal state,and environmental Kuznets curve did not appear. It should make efforts to develop countermeasures from the perspective of domestic sewage treatment,water conservation,and further adjustment of industrial structure.