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林业的循环运动,一方面是林业资源的循环,另一方面是林业经济的循环。前者指从造林、管护、采伐,再到造林的过程。原始的自然林是自生自灭的循环过程,人工经营林是通过一定的人为作用实现循环。后者指造林投资后将经济收益中的盈余部分用于扩大林业再生产。林业的运动是动态的循环,在发展、演变过程中,也会出现向“良性”和“恶性”两极分化的可能性。据1977—83年我省森林资源调查,全省现有蓄积量2.53亿立方米,年平均生长量为1578万立方米;林分面积6,000万亩,其中建国以来人工造林保存面积有2100万亩。由
The circular movement of forestry, on the one hand, is the cycle of forestry resources, on the other hand, the cycle of forestry economy. The former refers to the process of reforestation, management and protection, logging and reforestation. The original natural forest is a spontaneous circulation process, artificial forest is through a certain human effect to achieve recycling. The latter means that after the investment in the forestation, the surplus part of the economic benefits will be used to expand the forestry reproduction. Forestry movement is a dynamic cycle, in the development, evolution, there will be the possibility of “benign ” and “vicious ” polarization. According to the survey of forest resources in Shaanxi Province from 1977 to 1983, the province now has a total stock volume of 253 million cubic meters and an average annual growth rate of 15.78 million cubic meters. The stand area is 60 million mu, of which 21 million mu . by