第二部分在把长江上游地区划分为十二大区域的基础上，分别复原和分析了唐宋时期这些地区的森林覆盖情况。
In the second section the author analysed the distribution of the forest during the Tang and Song Dynasties on the basis of dividing these areas into 12 small regions.
为了改善林分质量、恢复原有森林结构和功能，有必要对低质林分进行改造。
In order to restoring the original forest structure and function, improving the quality of forest stands, it is necessary to transform low-quality forest.
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