特大型城市中公园绿地的生态用地效率研究-以南京市为例

随着特大型城市人口与经济的迅速发展，城市居民对生态环境要求日益提高。城市绿地的生态功能与绿地面积或绿量并非简单正相关，而是受到多方面因素影响,且这些影响因素之间可能存在相互作用。本课题以南京市130片公园绿地为对象，研究了绿地在吸收CO2、保护生物多样性及缓解热岛效应三方面生态功能的用地效率(即生态用地效率)，影响因子及作用机制；在重点分析各影响因子之间互作效应(中性或独立效应/协同效应/拮抗效应)及效应强度的基础上，建立三方面生态功能用地效率影响因子的综合作用模型。以尊重社会经济功能、充分发挥生态功能为原则，基于影响因子及其互作效应，就公园绿地的综合生态用地效率提出优化策略,以缓解特大型城市用地紧张与生态环境需求增加的矛盾。

With the rapid development of populations and economics in metropolises, residents have more demanding for better urban environments.The ecological functions of urban green space are not simply correlated with the its area or green volume, but are influenced by vaious factors, and these factors may interact with each other. Taking the green space in 130 parks of Nanjing as the research objects, the study will discuss the ecological land-use efficiency of green space in parks,in terms of three major ecological functions of green space: CO2 absorption, biodiversity conservaiton and heat-island alleviation, as well as the corresponding influencing factors and mechanisms. The comprehensive interaction models for all three ecological functions will be built based on analyzing the interaction model(neutral or independent/synergistic/antagonistic effects) among these influencing factors. In order to alleviate the conflict between land deficiency and increasing demanding for better environments，the optimizing strategy of the sythetic eological land-use efficienty will be discussed based on the influencing factors and interactions between these factors, under the principle of maxmuming the ecological functions in respect of the social and economic functions of parks.