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ITTO在2002提出的《热带退化与次生森林恢复、经营和重建指南》中将热带森林类别划分为原始林、修正天然林和人工林。修正天然林可分为经营原始林和退化与次生森林2个类型,其中的退化与次生森林包括退化原始林、次生林和退化林地。不同森林类别之间存在动态变化的过程,在一定条件下可以相互转化。在详细阐述ITTO对原始林、退化原始林、次生林和其他热带森林类别界定的同时,综述了ITTO热带森林类别分类体系的发展和其他组织与国际进程对不同森林类别的相关定义。
In its 2002 Guidelines for the Recovery, Management and Rehabilitation of Tropical Degradation and Secondary Forest, ITTO divided the tropical forest into primary forests and amended natural forests and plantations. The amendment of natural forests can be divided into two types: the management of primary forests and the degradation and secondary forests. Among them, the degraded and secondary forests include degraded primary forests, secondary forests and degraded forests. The process of dynamic changes among different forest categories can be transformed under certain conditions. In elaborating ITTO’s definition of primary forests, degraded primary forests, secondary forests and other tropical forest categories, an overview of the ITTO classification of tropical forest systems and definitions of different forest types by other organizations and international processes is provided.