Research On Carbon Sink Quantification And Design Of Baima River Park Based On Sponge City Concept

Under the background of global warming,the"dual carbon"strategy has made the construction of low-carbon cities inevitable.The construction of sponge parks is considered to be one of the starting points to solve climate problems,but there is no quantitative demonstration of whether sponge parks can really help the development of low-carbon cities under the background of"dual carbon",and the lack of relevant research and design methods makes it impossible to give full play to the benefits of carbon sinks after the completion of the park,and a series of current problems affecting the function of carbon sinks in urban parks in Xi’an also need to be solved urgently.Therefore,this paper establishes a quantitative research method for carbon sink of sponge-type parks represented by Baima River Park,quantitatively evaluates the carbon sink capacity of sponge-type parks,and provides quantitative support for sponge-type parks to help the development of low-carbon cities.According to the problem,an optimization strategy is proposed to provide method guidance for the optimization of carbon sink in sponge-type parks in Xi’an.Firstly,through the relevant basic combing,six types of factors affecting the carbon sink function of the park’s green space are obtained,and it is proposed that under the premise of meeting the requirements of the park sponge,the four elements of plants,water resources,energy and materials can be combined with the role of science popularization to improve the efficiency of increasing the sink and reducing emissions of the park’s green space.Secondly,the operation and maintenance stage of the sponge-type park in the whole life cycle is selected as the research scope,and the carbon sink calculation method suitable for the operation and maintenance stage of the sponge-type park represented by the Baima River Park is constructed.The carbon sink calculation includes a total of 8 processes in 3aspects:direct carbon sequestration,indirect carbon emission reduction and direct carbon emission,involving 5 aspects of plants,soil,terrain,lighting facilities and maintenance and management.Thirdly,the carbon sink function of Baima River Park is quantified.The sensitivity analysis results show that the most critical process of the carbon sink function of Baima River Park is the carbon sequestration process of plants,and the most core design element affecting the carbon sink function is plants,followed by sketch facilities and terrain.Fourthly,the impact of LID facilities on the carbon sink function of parks is analyzed.The results show that the carbon sink capacity of White Horse River Park is stronger than that of non-sponge parks,and the annual carbon sink is about 0.12 kg CO2eq/m~2/a higher than that of non-sponge parks.Therefore,the addition of LID facilities enhances the carbon sink capacity of parks.However,the impact of LID facilities on the carbon sink function has advantages and disadvantages,the advantage is to improve the park’s indirect carbon emission reduction capacity and reduce the carbon emissions generated by irrigation,the disadvantage is to affect plant carbon sequestration,soil carbon sequestration,and increase carbon emissions caused by soil respiration,pollutant degradation and permeable paving maintenance.(2)The addition of LID facilities makes the plant carbon sequestration function and indirect carbon emission reduction function contradictory,and the carbon sink level of the two cannot be optimized at the same time.Finally,aiming at the optimization of carbon sink in sponge-type parks,a carbon sink unit division method based on water catchment zoning and taking plant carbon sequestration+runoff reduction and emission reduction as the division standard is proposed from the layout level.From the perspective of elements,three design methods are proposed:plant carbon sequestration capacity,soil carbon sequestration capacity and small product facility optimization.The carbon sink capacity optimization design process of Xi’an sponge-type park with seven steps is summarized,and the applicability of the optimization design method to various parks is proposed for the four types of parks in the two situations of carbon sink optimization in sponge-type parks and carbon sink optimization when non-sponge-type parks are sponge-type parks.