Research On The Allocation Mode And Design Optimization Of Carbon Sequestration Plants In Green Space In Residential Areas

Based on the current rapid development environment of cities,carbon dioxide as the main component of greenhouse gases,its emission overload is an important factor leading to climate change.The negative feedback of urban habitats on climate change is particularly obvious,such as the intensification of urban heat island and rain island effects,significant differences in precipitation changes at different latitudes,frequent extreme weather and climate events,and the wider impact range,urban ecological environment is facing an important turning point,and urban problems caused by global climate change have received extensive attention from governments and researchers.In order to actively respond to climate issues,the 14 th Five-Year Plan clearly states that continuously increasing the increase of ecological carbon sinks,accelerating the development of a green and low-carbon society,and using clean energy are the key tasks for China to achieve the "dual carbon" goal.As an integral part of the urban green space system,residential green space is widely distributed in the city,is a green space directly contacted by residents in daily life,and at the same time is a direct carbon sink place in residential area,reasonable selection of tree species and optimization of group structure configuration are particularly important to improve green space carbon sink.The study of carbon sink of residential green space has become a key topic in the field of urban planning and landscape architecture.The distribution of residential areas in the main urban area of Xi’an is relatively dense,but due to insufficient utilization of green space,single plant community hierarchy in the built environment,and plant planting only considers the basic needs of green space layout,the carbon sink gap of green space in residential area is large,and the overall carbon sink capacity is low,which affects the ecological efficiency of green space and the quality of life of residents,and has certain room for optimization and improvement.Therefore,how to screen carbon sequestering plants and how to configure them in residential green spaces is the main problem in this study.In this study,the green space of the residential area in the main urban area of Xi’an was selected as the survey object,and the plant community and individual characteristic factors were investigated.On the one hand,NTBC(National Tree Benefit Calculator)software and biomass isokinetic growth equation were used to estimate the carbon sequestration capacity of plants,analyze the correlation between individual characteristic factors of plants and their carbon sequestration capacity,and summarize the differential laws of plants with high carbon sequestration capacity in green spaces in screening residential areas.On the other hand,the expert evaluation method and analytic hierarchy method are used to analyze the functional attributes and landscape attributes of the carbon sequestration plant cluster configuration applied to the green space in the residential area,establish a comprehensive index formula to control the cluster configuration of carbon sequestering plants in various green spaces in residential areas,and propose a conjugate mode for the cluster configuration of various green spaces in residential areas.The results show that trees and shrubs with strong carbon sequestration capacity exhibit the characteristics of large size,large biomass,fast carbon sequestration rate and high carbon storage,and can be used as the preferred tree species for carbon-sequestering plant communities.In the configuration of carbon sequestration plants in green spaces in residential areas,the carbon sequestration capacity of plants is comprehensively considered with functional requirements and landscape needs,and a conjugation mode of carbon sequestration plant cluster configuration suitable for various types of green spaces in residential areas is constructed,and targeted optimization schemes are proposed for research cases,and the feasibility of optimization schemes is verified by NTBC software.This study provides some theoretical support for the selection of carbon sequestration plants and plant landscape construction in green space in residential areas of Xi’an.