城市生态的氧平衡研究以南京市为例

STUDY ON BALANCE OF OXYGEN IN URBAN ECALOGY──TAKING NANJING──CITY AS ECAMPLE

城市化地区人的生存及其产业活动强度大、范围广，对氧的收支关系反应敏感。空气中氧的平衡能力及其可持续性，是促进城市社会经济与环境协调发展的基本条件。按南京总体规划确定的主城、中心城市圈及布域三个层次的格局，主城的氧亏可从城乡结占部的制氧空间得到足够的补偿。中心城市圈自身耗氧低，对主城的外延发展、卫呈城镇的工业化，新增大型耗能企业的布点均有较强的氧平衡能力。维护城市生态氧平衡的关键措施是建设城市生态防护网、加强对城乡结合部地区土地与资源开发的限制、合理布局城市的外延发展夸。

In urban areas,the ysubsisences of people and the productive acti-vities are so stronge and wide that they are sensible to gain-loss relation-ship of oxygen,The balance ability of oxygen and its continuability in air arebasic conditions for promoting larmomious development of social economy andenyiroment.According to General Plan of Nanjing,which includes threehierarchies:main city,central city sphere and city area,loss of oxygen inmain city can be compensated from producing-oxygen spaces in urban andrural joint areas.Because of its low self-consuming oxygen,central city sp-here has considerable balance ability of oxygen in expanding of main city,industrying of satellite towns and distributing of increasing big power-con-suming enterprises.The key measures for maintaining balance of oxygen inurban ecology include constructimg ecological protecting network of city,strengthening restrictions to land and resources exploitation in urban andrural joint areas,rationally planning extension of city, and so on.