北京翠湖国家城市湿地公园碳汇绩效评估研究

Study on Carbon Sink Performance Evaluation of Bejing Cuihu National Urban Wetland Park

城市湿地公园作为城市蓝绿空间的结合点,在城市碳库的搭建中发挥着重要作用。因此,合理评估城市湿地公园碳汇绩效并优化湿地结构,对实现碳中和、碳达峰具有重要意义。通过对北京翠湖国家城市湿地公园进行实地调研,结合遥感图像及相关碳汇计算方法,对湿地各分区(开阔水域、深沼泽、浅沼泽、湿草甸、灌木沼泽、林地)的碳汇能力进行评估。主要结论如下:(1)北京翠湖国家城市湿地公园年净碳汇量约为2 563 906.9 kg,单位面积净碳汇速率约为1.63 kg/(m^(2)·a),植物和土壤对其贡献度较大;(2)其中,林地碳汇效益最强,浅沼泽次之,再次为灌木沼泽和深沼泽,开阔水域最弱;(3)干湿交错区碳汇能力较弱且受水位影响变化较大,湿草甸碳排放量大于其固碳量,易成为碳源。

Urban wetland park,as the combination of urban blue and green space,plays an important role in the construction of urban carbon pool.Therefore,reasonable evaluation on the carbon sink performance of urban wetland park and optimization of wetland structure is of great significance for achieving carbon neutrality and carbon peak.In this paper,through the field investigation on Beijing Cuihu National Urban Wetland Park,combined with remote sensing images and relevant carbon sink calculation methods,the carbon sink capacity of each wetland area(open water,deep swamp,shallow swamp,wet meadow,shrub swamp,forest land)was evaluated.The main conclusions were as follows:①theannual netcarbonsink of Beijing Cuihu National Urban Wetland Park was about 2563906.9 kg,and the annual net carbon sink rate per unit area was about 1.63 kg/(m^(2)·a),which was largely contributed by plants and soil.The carbon sequestration benefit was strongest in forest land,followed by shallow swamp,shrubby swamp and deep swamp,and weakest in open water.③Thecarbonsequestrationcapacity ofthe dry-wet ecotone was weak and varied greatly under the influence of water level.The carbon emission of the wet meadow was greater than its carbon sequestration,and it was easy to become a carbon source.