在我国近年的城市建设中,因大量工业、商业、住宅、交通等工程项目的兴建,而大规模蚕食绿地的现象层出不穷.城市绿地锐减和工业污染加重,使多数城市的大气、水体和土壤中有害物质含量,均超出国家限定的安全标准,导致了城市生态的破坏. In our country’s urban construction in recent years, the phenomenon of large-scale encroachment of greenbelt due to the construction of a large number of engineering projects such as industry, commerce, housing, transportation, etc. The sharp decline of urban green space and the increase of industrial pollution have caused the air, water and soil in most cities In the hazardous substances, are beyond the national safety standards, leading to the destruction of urban ecology.