One species of tree replaces another as a forest ages.
随着森林老化，一种树会取代另一种树。
The key techniques to insure the quality and high yield are adjusting density timing and managing different tree ages as the growth of plant in construction of GAP bases.
结论保证金银花优质、高产的关键技术是：随树龄增长，适时调整密度，在GAP基地建设中，对不同树龄植株要分类管理。
The biomass of larch plantation of different site conditions and forest ages could be estimated by incorporating the individual tree biomass model and diameter distribution prediction model.
结合单木生物量模型和林分直径分布预估模型可以对不同立地、不同林龄下落叶松林分各组分的生物量进行预测。
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