Dong Yibo, Liu Maosong, Xu Chi, Zhang Cheng, Liu Zhibin
School of Life Science, Nanjing University, Nanjing 210093, China.
Ying Yong Sheng Tai Xue Bao. 2006 Aug;17(8):1408-12.
According to the buffers and urban fringes of Nanjing in 1988 and 2003, and by using landsat TM images and DEM data, 8 urban-rural gradient zones called I, II, III,......, VIII in this city were marked off, and the forest distribution pattern as well as the land use strategies along these gradient zones were studied. The results showed that in each of these zones, there was a significant positive correlation between the coverage of mountainous area and forest, and the forest coverages were obviously higher in mountainous than in flat area, with a distribution pattern of I > II, II < III, III approximately equal to IV, IV > V > VI > VII > VIII. In urbanizing area, there were three major landuse types, i. e. , urban building, ecological regulation (mainly forest stand), and agricultural production (mainly crop land). The potential value of a certain land use type became the leading cause of land use type selection. Inner city area had very low forest coverage because of its high exploitation value, and the ecological value of the outskirts within 10 km beyond the urban fringe was comparatively outstanding, with the forest coverage increased significantly. The forest coverage declined with the increasing distance to urban, because of the dominant station of the production value.
根据1988年和2003年南京的缓冲区和城市边缘区，利用陆地卫星TM影像和DEM数据，划分出该市8个城乡梯度带，分别命名为I、II、III、......、VIII，并研究了这些梯度带上的森林分布格局以及土地利用策略。结果表明，在每个梯度带中，山区面积覆盖率与森林覆盖率之间存在显著正相关，山区的森林覆盖率明显高于平原地区，其分布格局为I > II，II < III，III约等于IV，IV > V > VI > VII > VIII。在城市化区域，主要有三种土地利用类型，即城市建设、生态调节（主要是林分）和农业生产（主要是农田）。某种土地利用类型的潜在价值成为土地利用类型选择的主导因素。市中心区由于开发价值高，森林覆盖率很低，而城市边缘向外10公里范围内郊区的生态价值相对突出，森林覆盖率显著增加。由于生产价值占主导地位，森林覆盖率随着与城市距离的增加而下降。
