西藏山南地区土地利用结构信息熵值特征及演化规律研究

区域土地利用结构的变化是区域土地利用演变的直接体现,信息熵可以作为土地利用结构有序性的一种度量。借助信息熵理论对西藏山南地区1998~2005年及所辖12县(2005年)的土地利用结构熵分别进行了计算与分析,以揭示山南地区土地利用结构的熵值特征和演化规律,预期为该区域土地利用结构调整、土地利用总体规划等土地管理工作提供理论依据。研究结果表明:该区1998~2005年期间土地利用结构信息熵呈递增趋势,但是增长幅度较小,土地利用系统向无序方向发展;牧草地、林地、未利用地的高低是影响该地区土地利用结构信息熵大小及区域差异显著的决定性因素;山南地区土地利用结构熵值变化的的直接动因主要是土地利用结构变化和地方政策因素,而经济发展、人口增长等对土地系统熵值的动态变化也存在影响。

Research on Information Entropy Value Characteristics and Evolution Laws of Land Use Structure in Shannan Area of Tibet

The changes of regional land use structure show the evolution of regional land use directly.Shannon information entropy could be used as one measurement of land use structure orderliness.Based on Shannon information entropy theory,the land use structure entropy from 1998 to 2005 and 12 governed countries(in 2005) in Shannan Area of Tibet were calculated and analyzed,in order to reveal the entropy value characteristic and the evolution laws of land use structure in Shannan Area and provide the theory basis for the land management works such as land use structure adjustment and land use overall planning in this area.The study results showed that the land use structure information entropy of this area from 1998 to 2005 showed an increasing trend,though the change was very little.The land use system developed towards the disorderly direction.The decisive factors that affected the land use structure information entropy size and remarkable region difference were the height of grassplot,woodland and unused land.The factors influencing the land use structure information entropy variation in Shannan Area were mostly related with the land use structure changes and regional policies.And the economic development and population growth also influenced the dynamic variation of land system entropy value.