| The urban environmental planning refers to a kind of plans which coordinates the relationship between environmental protection and economic development.The principle of ordering the environmental,economic and social system should be insisted.At present,there are two types of unsolved technical problems within the urban environmental planning.One is the inaccuracy of calculating environmental capacity,building multi-objective programming model and analysing for the environmental carrying capacity.It might impact the scientific and rigorous of planning.Calculating the environmental capacity and its carrying capacity are the basis of environmental plan,which has a significant meaning to improving the environmental quality.The other one is the unreasonable assessment of calculating ecological service value and of ecological compensation standard.A good natural ecosystem provides humans invaluable value for living and social development.The ecological compensation is the main measure for protecting the ecosystem.Therefore,the two kinds of problems are both the key points for current environmental plan.In the paper,we focus on the two issues and improve the related research methods.In the first part,we discuss the concept of environmental carrying capacity.It is a complex vector including the natural and social elements.Within those two elements,the natural one refers to environmental capacity and the social one refers to the thresholds of human activity scale.Therefore,the environmental carrying capacity is the vector that concerns the environmental quality and economic-energy structure.As a case of Wuhan city,we build the 'economy-energy-atmospheric environment' model of multi-objective planning by System Dynamics(SD),which does not need to simulate the complicated physicochemical processes of atmospheric transmission and diffusion.To form a hypothesis,the climatic environment would be stable in the future.We set a model parameter about the economy,energy and atmospheric environment to be the basis of predicting the trends of gross domestic production(GDP),PM2.5 and six air pollutant emissions between 2016 and 2030 in 2 scenarios.Meanwhile,calculating the results of atmospheric environmental capacity and its carrying capacity constrained by GDP and PM2.5 simultaneously.The atmospheric environmental carrying capacity covers two parts,the 'expressive' and'recessive' indicators.The former one is the external comprehensive performance of the 'recessive' portion,referring to the emission reduction corresponding to the atmospheric environmental stress;the latter one could reflect the urban economic and energy structure and level of productive forces.The results provide a scientific recommendation for the development of PM2.5 control measures.Compared with other multi-objective model methods,the SD method retains the advantage of simplicity in resolving complex problems.And the results have been adopted by Wuhan environmental protection department.In the second part,as a case of Ezhou city's inter-regional ecological compensation,we choose an appropriate method with the priority of conformance to standard and simple in calculation,created by Xie G D in 2015 to measuring the regional ecological service value;amend the equivalent factor values based on the situation of regional ecological and environmental quality,calculate the ecological value of three districts in Ezhou city;recognize the ecological service categories with evident flow characteristics and describe their basic rules by the principle of entropy increase among the regions;according to the ecological function is proportional to its service value,designate the compensation area and present the calculating method for measuring the ecological output value,evaluate the ecological compensation weight and the value of ecological compensation in the research area.This method has already been used in the Ezhou city's inter-regional compensation analysis and the result has been recognized. |
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