Through processing these data, the transfer probability matrixes of three kinds of natural forest age were constructed.

经林龄转移资料归一化处理，构造出三类天然林林龄转移概率矩阵。

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It also shows low unit stock volume, unreasonable forest age structure, low forestland use ratio and severe pest, disease and rat disaster.

该流域森林资源有限且分布不均；单位蓄积量低，林龄结构不合理；林地利用率不高，病虫鼠害严重。

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But current forest management practices, including fire suppression, often create forests full of trees of uniform age, which are particularly susceptible.

但是包括扑火在内的现有林务实践，经常创造年龄段均一的树林，这种树林对于环境变化是很敏感的。

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The Franz Josef glacier on the west side of the Southern Alps of New Zealand advanced sharply during the period of the Little Ice Age, actually invading a rain forest at its maximum extent in the early 1700s.

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Orchha was an ideal place to build a capital as the town is sheltered by thick forest, which is probably the reason that these age-old monuments still exist in excellent condition, despite there being no major preservation efforts.

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