基于“二类调查”的三峡库区重点生态恢复县森林资源空间特征的遥感分析

以高分辨率SPOT-5影像为基础数据源，结合1∶1万地形图计算地形位综合指数，利用ArcGIS的空间叠加和缓冲分析功能，识别三峡库区重点生态恢复县不同地形位与不同道路、水体和聚落缓冲半径下的林地分布特征.结果表明： 研究区林地资源总量丰富，且以乔木林和灌木林地为主，受地形制约和林地自然基础影响，林地主要分布在“两山”(方斗山、七曜山)区；林地地形位分布指数随地形位梯度的增大而呈整体上升趋势，乔木林和灌木林地表现尤为明显，其他林地类型则相反；不同缓冲半径内林地面积占缓冲范围面积的比例在道路、水体和聚落周围随缓冲半径的变化，与林地地形位分布指数有很强的相似性；不同缓冲半径内各林地类型占样区相应林地面积的比例仅在聚落周围呈现竹林、疏林地和未成林造林地高于乔木林和灌木林地；样区林地分布首先受以山地为特征的大地貌格局所左右，而不同地形位以及不同道路、水体和聚落缓冲半径下的林地分布则主要受大地貌格局主导下样区人为活动的胁迫所驱动.

Remote sensing analysis of forest resources characteristics in main ecological restoration counties in the Three-Gorge Area based on the 2nd-class inventory data.

Based on high-resolution SPOT-5 images, combined with topographic(1:10000) calculating terrain-bit index, the distribution characteristics of woodlands in different terrain niches, and the buffer radii of different roads, water bodies and settlements were identified by using ArcGIS space overlay and buffer analysis function. Results showed that woodland resources were abundant, and arbor woodland and shrub land were the main species, which mainly distributed in two mountain areas (Fangdou Mountain, Qiyao Mountain) affected by topographic restriction and woodland natural basis. The woodland terrain niche distribution index showed an overall upward trend with increasing terrain niche gradient, especially for the arbor woodland and shrub land, while the other woodland types presented an opposite trend. The percentage of woodland area occupying the corresponding buffer radius around the roads, waterbodies and settlements had a strong similarity with the woodland terrain niche distribution index. Only around the settlements, bamboo forest, sparse woodland and immature woodland occupied higher percentages of the woodland area of the corresponding buffer radius than that of arbor woodland and shrub land. Woodland distribution was mainly controlled by large landform patterns of mountain features, while the distribution of woodlands in the different terrain niches and the different buffer radii of roads, waterbodies and settlements were driven mainly by duress of human activities under the auspices of the large landform patterns.