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传统的森林生产力是以一定时间单位面积干材部分蓄积量的大小来表示。显然,这种森林生产力的计量单位已经不能适应现代林业发展的需要。二、三十年前人们主要利用森林的木材部分,因为干材蓄积量是商品出材量的基础。但是,随着人们对森林认识的加深,特别是IBP(国际生物学规划组织)和MAB(人与生物圈组织)先后成立,兴起研究生态系统的热潮,发现森林生态系统与人类的关系尤为密切。由于世界性森林资源的减少,而造成或加剧土壤侵蚀、江河泛滥、环境污染、气候干旱,引起国际舆论
The traditional forest productivity is based on the volume of dry stock per unit area for a certain period of time. Obviously, this measure of forest productivity can no longer meet the needs of modern forestry development. Twenty years ago, people mainly used the wood part of the forest, because the stock of dry material was the basis for the amount of output of the commodity. However, with the deepening of people’s understanding of forests, especially the establishment of IBP and MAB, there has been a boom in research ecosystem and the relationship between forest ecosystems and human beings has been found to be particularly close. Due to the reduction of the world’s forest resources, it causes or aggravates the soil erosion, the floods of the rivers, the environmental pollution, the arid climate and the international public opinion