Analysis of Carbon Sink Benefits and Discussion on Configuration Models of Plant Communities in Waterfront Green Spaces in Chengdu City
In the context of"dual carbon",plant communities in urban waterfront green spaces can not only direct-ly increase sinks through photosynthesis,but also indirectly reduce emissions by regulating urban microclimate,which is of great significance for promoting urban low-carbon green transformation and sustainable development.This study focuses on the plant communities of waterfront green spaces in three waterfront areas:Huanhuaxi Park,Bailuwan Wetland Park,and Luhu Water City Scenic Area in Chengdu.Through field research,49 relatively typi-cal plant communities were selected,and the carbon sequestration benefits of the communities were calculated u-sing the NTBC model.The effects of tree species composition,vertical structures,diameter structures,planting density,and canopy closure on carbon sequestration benefits were analyzed.The results showed that:① evergreen plants and deciduous plants have similar effects on the short-term carbon sink efficiency of plant communities,and the carbon sink efficiency of coniferous and broad-leaved mixed plant communities and evergreen plant com-munities is higher than that of other community types;② the carbon sequestration benefits of plant communities with a"tree shrub grass"layered structure are greater than those with a"tree grass"double-layer structure;③ when the planting density of trees is within the range of 100～600 plants/hm2,the average crown width and average breast height diameter of trees have a significant positive effect on the carbon sink efficiency of plant communities.However,when the average breast height diameter exceeds the range of 40 cm,the carbon sink effi-ciency of plant communities decreases,while the average plant height of the community has no significant effect on the carbon sink efficiency of plant communities;④ within the same diameter range,planting density has a sig-nificant positive impact on the carbon sequestration efficiency of plant communities,and increasing the planting density of shrubs helps enhance the carbon sequestration capacity of plant communities;⑤ the canopy closure has a significant positive impact on the carbon sequestration efficiency of plant communities.Based on the analysis results,high carbon sink dominant plants were selected,and three types of plant community configuration models for waterfront green spaces were proposed:carbon sink benefit dominant,carbon sink landscape benefit dominant,and landscape benefit dominant,which provides a reference and support for establishing a waterfront green space plant landscape construction model suitable for high carbon sink benefits in southwestern China.
waterfront green spacecarbon sink benefitsplant communitiesconfiguration modeNTBC
万方数据
维普
