关键词: 城市化, 景观结构, 农业用地, 深圳市

Abstract: Remotely sensed mapping data and methods of landscape structure analysis were used to study the structure and spatial distribution characteristics of agricultural land patches during the fast urbanization process of Longhua area, Shenzhen City. Conclusions of the study were as follows: (1) The fast urbanization process made croplands decrease rapidly, but did not produce very significant impacts on the total area of the orchard; (2) Human landscape transformation during 1992 was very severely, and the cropland fragmentation could be divided into two different stages; (3) Random spatial distribution with microscopic heterogeneity of the two agricultural elements was maintained, but the evenness had a little bit decreasing. Compared with farmland, the spatial distribution of orchard expressed very different characteristics. Under continuous scale, distribution of orchard showed a regular pattern such as unevenness (small scale: side length of the box was shorter than 8 cells)-evenness (small and moderate scale: the length was among 8 and 50 cells)-unevenness (moderate scale: the length was among 50 and 200 cells)-evenness (moderate and large scale: the length was longer than 200 cells); (4) Human landscape transformation was the major impact factor of landscape changing, and a kind of moderate scale impact factor. The terrain was only a background impact factor; (5) During domestic landscape transforming in the working area, because the ecological maintenance value of two agricultural elements were not considered, their structural and functional equilibrium decreased gradually.

Key words: urbanization, landscape structure, farmland, Shenzhen City