论文部分内容阅读
使用2012年2.5m分辨率SPOT-5影像、2002年森林资源二类调查、参与式农村访谈等数据为基础,选取三峡库区典型森林资源大县且属长江生态屏障区的石柱西沱镇为样区,对近20年的森林景观退化的特征、过程与动因进行分析,旨在丰富人们对三峡库区森林景观退化特征的理解.结果表明:1森林景观作为样区主要的景观类型,受大地貌格局控制以原始林和次生林为主,展现强空间异质性;2样区森林景观退化特征在2002年前就已形成,之后基本沿着“森林转型”的轨迹正向演化,总体展现为前期的退化和后期的恢复两个截然相反的过程;3样区森林景观格局演化遵循临级优先原则,在空间分布上具有强异质性,不同时段的主要轨迹和空间分布差异较大;4立地条件是驱动样区森林景观演化的主要影响因素,农户行为追求收益最大化和政府行为退耕还林与天然林保护工程则是主要驱动因素,两者共同作用下便出现2002年前森林景观被开发为耕地和之后又被恢复为森林.
Based on the data of 2.5m resolution SPOT-5 images in 2012, the second type forest resources survey in 2002, participatory rural interviews and other data, we selected the Xishuo town of Shizhu, which is a typical forest resource county in the Three Gorges Reservoir area and belongs to the ecological barrier area of the Yangtze River This paper analyzes the characteristics, process and motivation of forest landscape degradation in recent 20 years in order to enrich people’s understanding of the degradation characteristics of forest landscape in the Three Gorges Reservoir Area.The results show that: 1 The forest landscape as the main landscape type, The dominant landscape pattern dominated by virgin forest and secondary forest showed strong spatial heterogeneity. The degradation characteristics of forest landscape in 2 sample areas had been formed before 2002, and then evolved along the trajectory of “forest transformation” The overall demonstration is the opposite of the earlier degradation and the later restoration. The evolution of the forest landscape pattern in the three sample plots follows the principle of “first-class priority” and has strong heterogeneity in spatial distribution. The main trajectories and spatial distribution differences at different time periods are relatively different Large; 4 site conditions are the main factors that drive the evolution of forest landscape, the maximization of farmers’ behavior in pursuit of benefits and government behavior of returning farmland to forests and natural forest protection projects are the main driving forces Su, both under the joint action will occur after 2002 years ago, the forest landscape was developed as farmland and has been restored to forest.