论文部分内容阅读
森林在其成长过程中,由于种子质量、树苗生活力、林木所处小环境条件(?)不同,从幼龄期起即出现林木分化,即同树种、同年龄的林木个体在形态、长势等方面出现差异。随着林龄的增长,会导致部分林木因密度过大,营养不足而逐步淘汰死亡,出现了森林的自然稀疏。需要强调指出的是,此种自然稀疏死亡的林木未必都低劣,而保留下来的林木未必都优良。通过自然稀疏调节的林木密度,是森林在该土地条件下,该发育期中所能“容纳”的最大密度,而不是最适密度。如听任森林自然调
Due to the difference of seed quality, seedling vitality and small environmental conditions (?) In the forest during the growth of the forest, forest differentiation occurs from the young age, that is, the same species, the individual of the same age in the shape, growth, etc. There are differences in aspects. With the increase of forest age, some trees will be gradually eliminated due to over density and undernutrition, resulting in the natural sparseness of forests. What needs to be emphasized is that such naturally sparsely-dwelling trees are not necessarily inferior, and the preserved trees are not necessarily good. The density of trees, adjusted by natural sparseness, is the maximum, rather than optimal, density that the forest can “hold” during this developmental stage under this land condition. If you can let the natural forest tune