建国以来,我国的林业有了很大的发展,但也暴露了一些值得注意的问题。在我国南方很多地方的人工造林中,往往偏重营造针叶纯林,甚至把原来生长良好的杂木林(包括各种阔叶林和针阔混交林)全部毁掉,统统种上杉木纯朴,或马尾松纯林。结果造成了森林生态平衡失调,一方面削弱了森林植被对生态环境的保护和调节功能;另一方面也给林木本身带来极其不利的影响。大面积的马尾松纯林松毛虫危害严重。土层浅薄向阳山坡的人工杉木纯林,常 Since the founding of our country, our country’s forestry has made great progress, but also exposed some issues worth noting. In afforestation in many parts of southern China, we tend to focus on creating pure coniferous forests, and even destroy all the well-grown mixed woodlands (including all kinds of broad-leaved forests and coniferous and broad-leaved mixed forests) with all kinds of pure Chinese fir or Pinus massoniana Pure forest. As a result, the imbalance of forest ecology has been caused. On the one hand, the protection and regulation functions of forest vegetation on the ecological environment have been weakened. On the other hand, forest ecology has been extremely adversely affected. A large area of ​​Pinus massoniana pine caterpillar serious harm. Artificial shallow layer of sunny hillside artificial fir pure forest, often