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准确掌握森林资源的消长动态,是科学管理森林资源的先决条件。对有特殊生长规律的森林,这一点尤为重要。引起森林资源变化的原因,一般可分成两个方面。一是由构成森林资源的各种群的生物学特性、生长现状及所处立地条件决定的,呈有规律的变化;另一个是人类活动及其它非正常因素引起的。
Accurately mastering the growth and decline of forest resources is a prerequisite for scientific management of forest resources. This is especially important for forests with special patterns of growth. The causes of changes in forest resources can generally be divided into two aspects. First, it is determined by the biological characteristics, growth status and the site conditions of the various groups that make up the forest resources, with regular changes; the other is caused by human activities and other non-normal factors.