Evaluation Study On The Ecological Redline Policy Implementation Effectiveness In Nanjing

With rapid economic growth and accelerated urbanization,the "production-living-ecological space"(PLES)is being squeezed and contradicted,and the competition for land-use has led to large changes in the spatial layout of the country,causing negative ecological effects in some areas.As a key administrative unit for land-use planning at home and abroad,the implementation effectiveness of urban ecological redline policy(ERP)plays a supportive role in resolving the chaotic state of the spatial pattern of the country and ensuring regional ecological security.Jiangsu Province,as the only pilot province in the country where the ministry and provinces work together to modernize the ecological and environmental governance system and governance capacity and the first batch of pilot provinces for the supervision of ecological damage to the ecological protection redline,took the lead in the country in 2013 to designate a province-wide ecological protection redline.Nanjing,as the capital city of Jiangsu Province,the key node of Yangtze River Economic Belt and the geographical center of Yangtze River Delta,has been facing severe challenges in recent years,while its strategic position in the city has been increasing,with the ecological space being continuously squeezed,the quality and service function of the ecosystem not being high,and the economic development and ecological environmental protection is highly conflicting.Therefore,how to scientifically and effectively evaluate the implementation effect of ERP and optimize ecological protection redline management has become an urgent issue in the construction of ecological civilization in Nanjing.Based on four periods of remote sensing data in 2005,2010,2015,and 2018,this paper uses GIS spatial analysis,ecosystem service valuation,and systematic evaluation method to carry out a study on the evaluation of the ERP implementation effectiveness in Nanjing,focusing on two key issues:(1)whether the delineation of ecological protection redline plays a facilitating role in ensuring regional ecological security,that is,to study whether the effectiveness of the ERP exists;(2)quantitative evaluation of the ERP implementation effectiveness under the influence of driving factors.To address the above issues,the main research contents and conclusions of this paper include:(1)The PLES pattern and the evolutionary characteristics of ESV in the ERAs and NERAs of Nanjing are compared and analyzed.Based on the dimensions of the ecological redline area,ecological function,and land-use nature,it was demonstrated that the designation of ecological redline can effectively slow down the decline of ESV and mitigate the trend of ecological environment deterioration.That is,the ERP is effective.(2)The DPSIR model was introduced to construct a theoretical framework for quantitative evaluation of the ERP implementation effectiveness in Nanjing,and the quantitative evaluation and analysis of policy implementation effectiveness were carried out in five dimensions: driving force,pressure,state,influence,and response.The overall index of the regional ERP effectiveness shows a trend of “small fluctuationsharp increase”,and the overall effectiveness of policy implementation is remarkable.(3)The changes in the subsystems and their effects on the policy implementation effectiveness were analyzed before and after the ERP implementation.Before the implementation of the ERP,it was mainly the driving force generated by the ESV and socio-economic demands that hurt the policy implementation effectiveness,and the regional ecological security situation was weakened;after the implementation of the ERP,the huge pressure brought by human activities on the ecological environment in the ERAs of Nanjing tended to weaken,and the overall spatial pattern of the regional PLES has improved,and the response coefficient of the ERP has increased significantly with the delineation of the ERAs.(4)Strategies to improve the ERP implementation effectiveness in Nanjing are proposed based on the evaluation results,including improving the ESV,optimizing the territorial spatial structure,and improving the level of ecological and economic coordination.