Citygreen模型在南京城市绿地固碳与削减径流效益评估中的应用

在剖析美国Citygreen模型评估城市绿地固碳效益与削减径流效益运算原理的基础上,将该模型应用于中国南京主城区,探索模型所需数据的获取方法及途径,计算不同类型城市用地的生态效益及价值.结果表明:城市地区不同类型植被固碳效益相当于等面积自然山林的5%～60%;南京主城区绿地固碳与削减径流两项生态价值之和约为1·77×108元;城市6类建设用地的植被固碳与削减径流生态效益从高到低依次为:绿地、公共设施用地、居住用地、道路广场用地、工业用地和市政设施用地.研究结果能够指导城市规划和绿地建设,并对中国城市绿地生态效益定量评价的广泛开展具有一定意义.

Application of Citygreen model in benefit assessment of Nanjing urban greenbelt in carbon fixation and runoff reduction

Based on the analysis of the framework and calculation principles of Citygreen model in assessing the benefits of urban greenbelt in carbon fixation and runoff reduction, an approach was made to obtain appropriate parameters of this model to calculate the ecological benefits of different urban land use types in the main urban district of Nanjing. The results indicated that the main urban district of Nanjing had much lower carbon fixation benefit than natural forest on per unit area base, being about 5%-60% of the latter. The ecological value of carbon fixation and runoff reduction of Nanjing urban greenbelt was about 177 million RMB in total, and the ecological benefits of different land use types were in the order of green land>public facility>residential>road and square>industrial>municipal. This research could provide references for city planning and urban greenbelt establishment, and facilitate the popularization of quantitative assessment on greenbelt ecological benefits of Chinese cities.