The integrated wetland conservation and development in the context of city expansion

Based on the previous theoretical framework,in this paper we discuss and develop the mode of integrated wetland conservation and development in the context of city expansion and ecological planning by considering Nansha Area in Guangzhou as an example. Using the remote sensing images,wetland distributing maps and the historical data,we divided the wetlands of Nansha Area into three classes,that is,coastal water and seashore wetlands, reservoir wetlands,and irrigation rice wetlands and hydrophyte wetlands.Conforming to the principle of ecological precedence,we select nine ones as the key wetlands from all kinds of wetlands.And then we evaluate and analyze the nine wetlands' conservation values and exploiting pr-ospects from two aspects of the use value and un-use value.The value evaluating results for the key wetlands conservation are in the following order:the 19th ChannelShiziyang and Zhujiang Estuary Channel Jiaomen Channel Seriesthe Eastern Bank of Longxue IslandHongqili Channelthe Eastern Bank of Dahu IslandBaihuitian and Shenwan Reservoirthe Western Bank of Masha Island the Western Part of the 15th Channel.Based upen which we testified the rare characteristics of the key wetlands.National,provincial,local,special,and time rarities are the main criteria for valuating the nine key wetlands.In which the 19th Channel and Shiziyang and Zhujiang Estuary Channel represent the highest rare degree.According to the definition for the domestic and overseas nature reserves and the analysis of managing objectives,we define the conservation nature of wetlands in the Nansha Area and identify that the planning direction of wetlands in the Nasha area should be wetland resources and landscape conservation area. Based on the similarity theory,we mainly made a replaceable and compensable feasibility analysis of the 19th Channel,the Eastern Bank of Dahu Island and the Eastern Bank of Longxue Island,the latter two areas are not suitable to replace the first one,but may be suitable to compensate each other to some extent.All the above reasons fully expounded the importance and urgency of building and developing the wetlands conservation area in the Nansha Area.After that,we partition the functional regions of the wetland conservation areas and put forward the action plan of wetland conservation preferentially.