中文摘要：

【目的】结合环境脆弱性特征,判析林地生产力的演变状况,为林地资源的优化利用和森林资源经营管理提供指导。【方法】以福建永安市的林地为研究对象,分析1999年、2008年林地利用结构信息熵、林地生产力等级熵的变化,探讨林地生产力信息熵的内涵,引入土壤侵蚀、土壤有机质、植被净第一性生产力（NPP）和归一化植被指数（NDVI）作为林地生产力信息熵的影响因子,构建林地生产力信息熵突变模型,分析林地生产力的突变可能性。【结果】1999年、2008年福建永安市林地利用结构信息熵分别为0.740 4和0.785 8,林地生产力等级熵分别为0.562 4和0.546 8,在以脆弱度等级为步长的林地生产力演变中,1999年的林地生产力未发生突变,而2008年发生了突变。【结论】1999-2008年10年间福建永安市注重脆弱性林地资源的保护,林地资源总体处于较高强度和较有序的开发利用状态。

英文摘要：

【Objective】Mastering the forestland productivity evolution with the environment factors will provide guidance for the optimistic use of the forestland,the forest management.【Method】By analysing the forest using structure information and the forestland productivity hierarchical entropy in 1999and2008 with the help of the entropy theory,the concept of the forestland productivity entropy were discussed in this paper.The forestland productivity evolution in Yongan City were measured by the forestland productivity evolution model based on entropy catastrophe theory and the factors that effected the forestland productivity entropy：soil erosion,soil organic,NPP,NDVI.【Result】Forest using structure entropy is0.740 4in 1999 and 0.785 8in 2008,the forestland productivity hierarchical entropy is 0.546 8in 1999and0.562 4in 2008.According to the fragility grade as the measure factor,the evolution of the forestland productivity did not occur in 1999,but occurred in 2008.【Conclusion】All these showed that the forestland re-sources in Yongan city were at a high degree of status and a state of order for development and utilization with the protection had been put on the high fragility of regional forestland from 1999 to 2008.