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

摘要： 利用多时段景观遥感制图信息和景观格局分析方法，对深圳市龙华地区快速城市化过程中农业用地的结构和空间分布特征进行了研究。主要结论如下：(1) 快速城市化过程导致农田面积显著减少，对果园的总体规模影响不大；(2) 1992年是工作区内城市化过程影响最为剧烈的年份，农田的碎裂化过程可以分成两个不同的阶段；(3) 农田和果园的空间分布均维持了相对微观异质性随机分布，但均匀性程度有所降低。果园在中尺度区间的空间分布与农田相比表现出显著的差异，连续尺度的空间分布表现出不均匀(小尺度：滑箱边长小于8个像元)—均匀(中小尺度：边长在8～50个像元之间)—不均匀(中尺度：边长在50～200个像元之间)—均匀(中大尺度：边长大于200个像元)的变化规律；(4) 人为改造作用是景观动态变化的主要驱动力来源，并且表现为一种中尺度影响过程，地形因子则为背景性影响因素；(5) 景观改造活动由于未能兼顾农业组分在区域生态稳定性维护方面的价值，两种组分的整体结构和功能稳定性有所降低。

关键词: 城市化, 景观结构, 农业用地, 深圳市