成熟的用材林应当根据不同情况，分别采取择伐、皆伐和渐伐方式，森林砍伐和退化的根本原因全球讲习班
For mature timber stands , the approaches of selection cutting , clear cutting and shelterwood cutting Global Workshop on Addressing the Underlying Causes of Deforestation and forest Degradation
渐伐