| In the process of construction,management and maintenance of urban road green spaces,due to the irrationality of planting and management models,the irrigation water demand for urban road green spaces will increase,leading to high carbon emissions and even exceeding carbon sequestration.Therefore,how to reduce water resource consumption and enhance the carbon sequestration function of urban road green spaces to alleviate urban environmental problems has become an urgent problem that needs to be solved.Based on existing carbon storage and irrigation water estimation methods,this article selects 39 roads in the main urban area of Hangzhou as the research object to explore the spatial structure layout characteristics,carbon sequestration level,and water resource consumption of road green space vegetation.Based on the calculated water demand and carbon density,the plant combination characteristics of low water consumption and high carbon sequestration combinations are obtained.Therefore,strategies for creating different types of road green spaces are proposed,To provide reference and support for establishing a multidimensional and suitable plant combination for road green spaces in Hangzhou.The specific research results are as follows:(1)Conduct an investigation and study on the plant species,growth status,characteristics,plant combination configuration,plant management,and plant planting standardization of road green spaces in Hangzhou.There are a total of 56 plant species in the road green space sample plot of Hangzhou,with a relatively rich variety of plant species.In the green spaces of roads in Hangzhou,tree species and plant planting density are the main trunk roads>secondary trunk roads>branch roads.In terms of application frequency,there is a problem of concentrated plant species and high similarity.(2)The water demand for urban road green space irrigation is related to climate conditions,green space area,and green space combination configuration form.Analyzing the factors that affect the irrigation water demand of road green spaces in the sample plot,it was found that the irrigation water demand of road green spaces varies in different seasons,with higher irrigation water demand in July and August;The irrigation water demand varies among different levels of road green spaces,with the irrigation water demand of primary and secondary main roads exceeding that of branch roads.(3)Analyze the factors affecting the carbon storage of road green spaces in Hangzhou,including tree species,plant height,crown width,diameter at breast height,life form,and the hierarchical density and structure of vegetation combinations,which are related to plant carbon storage.The tree species with higher carbon sequestration capacity include Erqiu Suzuki,Wuweizi,Zelkova,Willow,Cinnamomum camphora,Luan,Ginkgo biloba,Eucommia ulmoides,Magnolia grandiflora,and Sophora japonica;The carbon storage value of trees is generally greater than that of shrubs;The carbon storage of broad-leaved trees is greater than that of coniferous trees;Evergreen plants have strong carbon sequestration ability;When the plant combination has a multi-layer structure with appropriate density,the plant growth environment is better,which is more beneficial for improving carbon sequestration efficiency.(4)Based on the previous investigation and research on the tree species and configuration mode of road greening in Hangzhou,as well as the calculation of irrigation water demand and green space carbon sequestration capacity,it is known that there are problems with unreasonable allocation and inadequate maintenance of urban roads in the main urban area of Hangzhou.This article proposes corresponding optimization strategies for the plant combinations in different types of road green spaces,To effectively improve the carbon sequestration capacity of urban road green spaces and the utilization of water resources.This study takes Hangzhou’s road green spaces as the object and reveals the relationship between planting design,urban carbon sequestration,and irrigation water demand.The research conclusion can be directly applied to road green space maintenance and management,further supporting the application of plants in urban road green spaces.The research results will help to increase the policy formulation related to Biological carbon fixation and water resource consumption costs of road green space,and improve the regulation services of road green space ecosystem. |
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