陇南山地土地利用结构动态演变分析

Analysis on Dynamic Evolution of Land Use Structure in Mountain Area of Longnan

以土地利用变更调查数据为基础,借助信息熵原理分析了陇南市1996-2008年土地利用结构的时间演变规律及空间差异特征。结果表明:研究区土地利用结构信息熵经历了3个发展阶段:即缓慢增长期、显著下降期和快速回升期,熵值在波动中趋于降低,土地利用系统向低水平的有序状态发展。信息熵的区域差异显著,且变化趋势各异,除武都区与两当县的土地利用系统趋于稳定外,其余各县尚处于显著变化中。

Based on the data of land use change,the temporal evolution and spatial difference of land use structure was analyzed with information entropy theory in mountain area of Longnan from 1996 to 2008.The results showed that the information entropy of land use structure in study area had gone through three development stages： slow growth phase,significant decline phase and rapid recovery phase,the overal entropy presented decline trend,and its land use system tended to become low level ordered state.The regional entropy was significantly different,also their changing trends were varied.Except Wudu District and Liangdang county,whose land-use systems tend to stabilization,others are still remaining in a significant change states.