Ecological Planning On Urban Green Land System

Urban green land is an artificial ecosystem which is interfered with mankind, regard soil as ground substance, rely on vegetation and grow with microorganism and animal's community. Having self-purification ability, green land is claimed into " green lung ". It is a negative feedback subsystem of urban ecosystem and the essential composition of the security system. Urban green land is an infrastructure of the sustainable development playing an important role on urban bio-diversity protection and being the life-supporting system of the urban ecosystem which can't be substituted by other infrastructure in protecting and resuming city green environment, maintaining the urban ecological balance and improving the ecological environmental quality. So regarding urban ecology as the core, it is a development strategy of the modern city to improve urban green ecological function and landscaping levels . It is the inexorable trend that the city's development reaches benign cycle, too.At the beginning of 1990s, Dehua government has proposed the thought of big country construction. Through 10s year efforts, urban area total population has rose to more than 160,000 at present from 50,000 and the urban area is expanded to present 7.8km2 from 2.73km2, which has improved the urbanization level. But with the constant promotion of urbanization, the urban area ecological environmental quality drops while a series of environmental problems appear. How to solve such problems as air pollution, ecological disruption etc, different departments have jointly study already. So, this text employs green land theory and sustainable development theory to plan Dehua's green land system, making country's development, natural ecological environmental protection and urban green land construction together. Its contents are follows:(1)Introduce green land development, domestic and international related studys about urban green land construction.(2)Introduce land theory to guide urban green land construction(3)Introduce the situation of city's development , deficiency of present green land construction and the meanings of the study.(4)Consulting domestic and international urban green land construction mode and combining with the special natural conditions of mountain region, it proposes the overall frame of green land construction. Through this planning, there is a wedge type green land system with parts of point, line and poly.(5)Ecological planning about green land of water. It constructs water green land through natural river construction, bank vegetation belt construction and near-water district planning.(6)Road afforesting. Construct a traffic corridor network combining with ecological function, traffic function and landscape function.(7)building inhabitant region land system with keeping natural elements, planning inhabitant region park, street green land, roof park, wall park etc.(8)Trees planning. Offer enough vegetations for the urban green land system construction.(9)Point out the shortcomings of this research and right direction in the future.