武汉园博园蓝绿空间碳汇绩效研究

Research on Carbon Sink Performance of Blue-Green Landscape Spaces in the Wuhan Garden Expo Park

探讨城市绿地蓝绿空间碳汇绩效有益于指引城市碳库合理建设和碳汇科学评估。在已有绿地碳汇研究中,中观尺度研究相对较少,且少考虑蓝绿空间的综合效益。尝试对已建5年的武汉园博园跟踪调研,关注园区水体、绿地组成的蓝绿空间碳汇能力综合评测,通过ENVI与GIS软件,结合施工图与现场抽样调研获得场地基础信息,对园区植被、土壤与水体分别评测,借鉴美国国家树木效益计算器、生物量法等方法,初步得出:(1)园区蓝绿空间总碳汇约111485.4吨;(2)植被和土壤为主要贡献对象,分别占62.9%、36.96%;(3)选择碳汇能力较高的植被,如碳汇强的乔木类,能显著提升绿地碳汇效益;(4)非硬化土壤具有较大的碳汇贡献;(5)园区蓝色空间水体碳汇量仅占0.14%,湿地中绿色植物可提升水体碳汇效果。旨在为城市绿地碳汇绩效评估提供综合性的蓝绿空间研究思路与方法的案例研究参考。

Investigation of the carbon sink performance of blue-green landscape spaces in urban green lands can help guide reasonable construction of urban carbon pools and allows for scientific assessment of carbon sinks.Among the existing studies,there are few mesocale studies and the comprehensive benefits of blue-green space are rarely investigated.Thus,here,we attempted to perform a tracking investigation of the Wuhan Garden Expo Park,which was built five years ago.In particular,attention was paid to the comprehensive assessment of the carbon sink capacity of the blue-green space formed by the water and green lands in the park.General information on the park was acquired using ENVI and GIS software and included the combination of construction drawings and on-site sampling surveys.Vegetation,soil,and water environments in the park were assessed with reference to the National Tree Benefit Calculator of the USA and the biomass method.The findings led to several major conclusions:(1)The total carbon sink in the blue-green space is about 111,485.4 tons;(2)Vegetation and soil are major contributors to the carbon sink,accounting for 62.9%and 36.96%,respectively,of the total carbon sink;(3)Vegetation with high carbon sink capacity,such as trees with strong carbon sinks,can significantly improve the carbon sink benefits of green land;(4)Non-hardening soils significantly contribute to carbon sinks;(5)Water in the blue-green space only accounts for 0.14%of the carbon sink.Green plants in wetlands can improve the carbon sinking effect of water.This study provides a reference for future research on carbon sink performance assessment in urban areas.