【摘要】 该文对比阐述了国内外关于森林退化的涵义、评价指标、类型划分等内容,基于与区域相比更小的微观尺度提出了森林退化评价指标体系,包括森林结构、生态功能、系统稳定性等3个方面的一级指标和群落结构、林层结构、树种结构、植被总覆盖度、郁闭度、自然度、森林生产力、天然更新、森林健康、龄组等10个二级指标;以及森林退化类型:包括森林群落完全丧失型、森林群落基本丧失型、森林群落残次型3种类型,其中森林群落残次型又可细分为林相残破型、林相老化型、林分衰退型、结构简单型、自然灾害型等5种小类型。更多还原

【Abstract】 Contrast expounded at home and abroad about the meaning of forest degradation, evaluation index and classification,based on the microscopic scale compared with area smaller put forward the evaluation index system of forest degradation,including forest structure,ecological function,the system stability and so on three aspects of the primary index and community structure,forest layer structure,tree structure,vegetation coverage,crown density and naturalness,forest productivity,natural regeneration,forest health,10 secondary indexes such as age group;And forest degradation types,including three types: complete forest community loss type,basic forest community loss type,and forest community residual type. Among them,forest community residual type can be subdivided into five types, including forest facies residual type, forest facies aging type, forest stand decline type,simple structure type,and natural disaster type.更多还原