| In the process of rapid urban development,carbon dioxide emissions are also increasing,which in turn leads to ecological problems such as global warming,destroys the ecological environment on which mankind depends,and becomes a serious threat to the sustainable development of society and economy and affects human health.important question.Therefore,in view of the low-carbon development of cities,making urban carbon emissions and carbon sinks gradually tend to balance is the trend of future social development.As put forward in the14th Five-Year Plan:Improving the capacity of ecological carbon sinks and increasing the increase in ecosystem carbon sinks is one of the important tasks for my country to achieve the goal of"carbon peaking".Carbon sinks are an indispensable part of the carbon cycle of the ecosystem.Urban green space systems are closely related to the environment of human life.Studying the estimation of carbon sinks in urban green space systems can provide data for close-range solutions to carbon balance issues.Support is an important part of low-carbon city planning.At present,there are few methods for measuring carbon sinks in the built environment of cities.Therefore,this article attempts to combine existing carbon sink estimation methods,taking the green space at the overall planning level as the research object,and propose a kind of urban green space carbon suitable for the overall planning.The sink estimation method is expected to provide reference value for the low-carbon planning and design of urban green space.This article summarizes the related research and analysis of green space carbon sinks in different disciplines and compares the existing carbon sink estimation methods,so as to improve the existing methods that can be used to estimate the green space carbon sinks at the city level to make them consistent with Contents and indicators of domestic urban green space system planning.And taking the green space at the overall planning level of Xi’an city center as an example,field investigation and data analysis were carried out;and the carbon sinks of the sample plot and the current green space were measured by the biomass allometric equation method and the remote sensing inversion method.,So as to obtain the relevant parameters of the green space carbon sink measurement at the level of Xi’an City Master Plan;through the improved estimation method to carry out the carbon sink estimation and result verification of the overall planned green space of Xi’an City;finally the improved carbon sink estimation method The application is discussed.The research content of this article is as follows:First of all,it distinguishes and elaborates the related concepts of carbon sinks,urban green space,vegetation,etc.,and summarizes and sorts out the research on carbon sinks and related theories in multiple disciplines.Through combing and comparative analysis of the existing carbon sink estimation methods at home and abroad,the aspects that can be used for reference by different carbon sink estimation methods are obtained.Secondly,it analyzes the relevant content and indicators of the green space system planning at the overall planning level,summarizes the data available in the overall planning stage,and combines the influencing factors of urban green space carbon sinks,and selects the ideas for the estimation of carbon sinks in human settlements proposed by the IPCC.The estimation principle is analyzed,and on this basis,the estimation method applicable to the domestic general regulation level and the acquisition method of the parameters involved in the method are proposed.And discussed the applicability of this method.Thirdly,taking Xi’an’s central urban area as an example,it analyzed and interpreted the status quo and planning content of green space at the general plan level in Xi’an’s central urban area.Based on field investigations,it analyzed the relevant characteristics of Xi’an’s green space vegetation in order to extract the city of Xi’an The relevant parameters of green space carbon sink estimation provide data support.Finally,on the basis of sample surveys,an empirical analysis of the influencing factors of green space carbon sequestration was carried out.Based on the measurement of sample site carbon sequestration and the overall green space carbon sequestration calculation based on remote sensing inversion method,the total amount of carbon sequestration in central Xi’an was extracted.Estimation of the relevant parameters of green space carbon sinks,and estimated the carbon sinks of the planned green spaces in Xi’an city center.Finally,the improved carbon sink estimation methods and the application of relevant parameters obtained in this chapter are summarized.Based on the above research,this article is based on the existing carbon sink estimation method,combined with the carbon sink influencing factors and the urban overall planning and green space system planning content and indicators,and on the basis of the carbon sink measurement method proposed by the IPCC,it is proposed to be applicable to the overall city Greenbelt system carbon sink estimation method at the planning stage;using the survey data of greenbelt vegetation in downtown Xi’an,it was demonstrated that the factors influencing the greenbelt carbon sink include tree species,arbor,shrub and grass coverage,plant height,crown width,and diameter at breast height,The horizontal structure and vertical structure of the vegetation community,as well as the type of green space,found that the high-carbon sink vegetation includes poplar,soapberry,zelkova,larch,camphor,cedar,platanus,ginkgo,etc.;through sample site inventory and remote sensing The inversion method obtains the carbon density values??of various types of green space at the general plan level of Xi’an city center.The average carbon density of park green space is 1.32kg/m~2,and the carbon density range is 0.6～1.5kg/m~2;square green space carbon density The carbon density is 0.96kg/m~2,the carbon density range is 0.3～1.2kg/m~2;the carbon density of the protective green space is1.77kg/m~2,and the carbon density range is 1.2～2.1kg/m~2;finally,the carbon density value and the carbon fixation rate are used to estimate The total carbon sinks and annual carbon sinks of the planned green space in Xi’an’s central urban area. |
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