Analysis of landscape transfer intensity at Shenzhen Bay

Shenzhen Special Economic Zone (SEZ) was established as a model city in 1979 and it has become a modern industrialization urban during the past three decades. The rapid urbanization has a significant effect on the wetland landscape, and Shenzhen Bay is a typical example. In this paper, the urbanization process in Shenzhen special zone was divided into four stages: early urbanization phase, developed urbanization phase, accelerated urbanization phase and later urbanization phase. The quantitative description characteristic of three main wetland landscape types, including Gei Wei, Mangrove and Intertidal Zone in Shenzhen Bay, were analyzed with grid analysis method, including three different grid scales, 100, 200 and 300 m, by applying the platforms of ARCGIS. The results are as followed: (1) In the developed urbanization phase, most grids of Gei Wei were transfered with medium strength and focus on the fastest urbanization zone - Futian District, which means Gei Wei suffered heavily humanity destruction and a lot of Gei Wei changed to the humanity landscape such as the built-up area. From 1989, the number of grids which turned out to other landscape types was small with low transfer intensity. (2) The transfer area of mangrove was mainly concentrated in the vicinity of the Futian mangrove conservation area, and the transfer strength of which is essential low. From 1989 to 1998, the strength that grid of mangrove turned out to other landscape types was very high. (3) The transfer situation of intertidal zone is more complicated. First, its transfer space range was discontinuous. Second, there was a cycle for turn in or out in time. (4) The analyses of three different scales for transfer intensity grid were all based on the Jenks natural classification method. The size of grid may cause greater impact in the space distribution of four transfer intensity types. The grid with 200 m scale was the most appropriate scale for the analysis.