论文部分内容阅读
森林转型是指森林覆盖率由净减少到净增加的过程。中国森林早在20世纪80年代就进入了转型期,然而,中国热带地区的总森林覆盖率虽呈增长趋势,但依旧存在着天然林大量被毁的现象。鉴于天然林对森林生态系统功能的重要作用,本研究通过加入森林类型分类的内容,以西双版纳为例探讨其森林转型的真实特征。结果表明:森林转型理论单纯以“总森林”覆盖率为研究对象,忽视了其他森林类型的动态变化,甚至掩盖了“天然林”的真实动态变化。西双版纳的森林转型主要是人工种植林的扩张所致,只是树木数量统计上的转型。事实上,自1988年以来,西双版纳的天然林一直在锐减。所以建议未来关于森林转型的研究应将“森林”区分成不同的森林类型加以研究。
Forest transformation refers to the process of reducing forest cover from net to net increase. As early as the 1980s, China’s forests entered a period of transition. However, the total forest cover in the tropical regions of China has shown an increasing trend, but there are still many natural forest destroyed. In view of the important role of natural forest in the function of forest ecosystem, this study explored the true characteristics of forest transformation by adding the content of forest type classification and taking Xishuangbanna as an example. The results show that the theory of forest transformation simply focuses on the coverage of “total forest ”, neglects the dynamic changes of other forest types and even masks the real dynamic changes of “natural forest ”. The transformation of forests in Xishuangbanna is mainly caused by the expansion of planted forests, but only the quantitative transformation of trees. In fact, natural forest in Xishuangbanna has been plummeting since 1988. Therefore, it is suggested that the future research on forest transformation should study the classification of “forest” into different forest types.