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。
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。
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。
Yet after her death at age 100, Grace Groner left Lake Forest College a gift of $7 million to be used for scholarships.
然而当格蕾斯•格鲁诺(Grace Groner)以100岁高龄去世后，她留给森林湖学院(Lake Forest College)700万美元作奖学金之用。
Forest on the islands grows and dies by itself. Nowadays nobody chops or clears the age-old trees with fire.
岛上森林自生自灭。现在没有人来清理这些老朽的树木来生火。
By the statistical analysis method, the authors researched the growth model and cutting age of masson pine natural forest with the sample plot inventory data.
根据标准地调查资料，应用统计分析方法研究生长模型，并结合森林经营实际确定采伐年龄。
How to manage optimally and make use of the resource will play an important role in sustained-yield forest management in Heilongjiang province and determining the age of harvest cutting is the key.
如何合理地经营利用好这部分资源，对该省森林永续经营利用起到重要作用，其主伐年龄的确定是关键问题。
The visit to the Stone Forest was the first time it dawned on me that China's pristine pre-plastic age was about to end, abruptly.
石林之行让我第一次认识到中国原始的前塑料时代即将嘎然而止。
In forests anywhere between 15 and 800 years of age, the study said, the net carbon balance of the forest and soils is usually positive - meaning they absorb more carbon dioxide than they release.
在森林的地方15至800岁，这份研究报告说，净碳平衡的森林和土壤通常是积极的-这意味著他们吸收更多的二氧化碳比他们释放。
It's found that the major factors affecting the forest growth are temperature, stand age, precipitation and soil depth.
发现影响林分生长的主要因子是温度、降水量和土壤厚度。
The results show that soil and water conservation forest gives its maximal benefit after definite age.
研究结果表明，水土保持林要达到一定的年龄才能发挥其最大的水保效益。
Species composition, quantitative dynamics and effects of gap age and gap size on species compositions were studied in the tropical montane rain forest of Bawangling Natural Reserve, Hainan Island.
分析了海南岛霸王岭自然保护区热带山地雨林林隙内树种的种类组成、数量动态以及林隙年龄和林隙面积对树种组成及数量的影响。
The undergrowth vegetation biomass in Korean pine plantations declined over years and was less than that of the mixed forest of Korean pine and secondary natural forest at all age stages.
林下植被生物量随林龄增长而降低，所有年龄阶段红松人工林林下植被生物量都低于红松混交林和天然次生林。
From the age scope and total amount, the species group of seedlings under forest crowns has stability.
林冠下的幼树种群从年龄范围和总体上具有一定的稳定性。
Using the linear programming method, they have set up a mathematic optimization model for adjusting age-grade of timber forest in Hushan Forestry Farm of Suichang, Zhejiang.
用线性规划的方法建立遂昌湖山林场用材林龄级调整最优化数学模型。
The results showed that in 1985, mature broadleaved and coniferous forests occupied 68.52% of the forest resources, but in 1999, medium-age broadleaved and coniferous forests occupied 65.96%.
结果表明：1985年研究区森林资源本底为成熟阔叶林和成熟针叶林，二者联合比例为68.52%；1999年为中龄针叶林和成熟阔叶林，二者联合比例为65.96%。
The decay class distribution of gap-makers indicated that the mode of gap formation and gap-maker species changed with age of the forest;
林隙形成木的腐烂等级分布揭示出林隙形成木的形成方式和种类组成均随时间变化。
So there is still great growth potential in forest carbon storage. (2) The area of dominant species and the changes of age groups are closely related to carbon stock changes.
虽然栎类在三个时期面积变化不是很大，但随着树木的生长，总碳储量仍不断增加。
So there is still great growth potential in forest carbon storage. (2) The area of dominant species and the changes of age groups are closely related to carbon stock changes.
虽然栎类在三个时期面积变化不是很大，但随着树木的生长，总碳储量仍不断增加。
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