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世界林业的发展大体经过三个阶段。第一阶段即传统林业阶段,人们用林木作房屋、家具、用具、烧柴。第二阶段为工业化林业,人们为了获取大量工业用材,大肆砍伐原有森林,以单一的树种取代天然的混交林,偏面追求高生产水平,满足工业发展的需要,造成生态平衡失调,社会与自然的矛盾尖锐化。第三阶段是综合林业,即在森林遭到严重破坏,环境日益恶化的情况下,把森林的经济效益和生态效益结合起来,最大
The development of forestry in the world generally goes through three stages. The first stage is the traditional forestry stage, people use trees for housing, furniture, appliances, firewood. The second stage is industrialized forestry. In order to obtain a large amount of industrial timber, people wantonly cut down the original forests and replace the natural mixed forests with a single tree species. They devoted themselves to pursuing high production levels and meeting the needs of industrial development, resulting in ecological imbalances. The contradictions of nature are sharpened. The third stage is integrated forestry, that is, under the circumstance of deteriorating forests and deteriorating environment, the economic and ecological benefits of forests are combined to the maximum