密度与林龄的拟合以S函数为最优模型。
S function was the best model in the fitting between stand density and age.
调查发现，病害发生程度与林龄、海拔密切相关。
It was discovered that the degree of disease was related to age of trees and altitude firmly.
苔藓最大持水率平均为945%，在林龄和海拔间差异不显著；
The mean MWHR of moss was 945% and there was no significant difference among stands with different ages and located at different elevations.
土壤有机碳含量随林龄的增长而逐渐增高，有机氮则先减后增。
Soil organic carbon increased with stand age, while nitrogen decreased and then increased.
两种源单株材积随林龄加大，差异增大，但增长百分比随之减少。
The differences in single tree timber volume enhance with the increase of stand ages, but the increasing percentage decrease.
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。
Through processing these data, the transfer probability matrixes of three kinds of natural forest age were constructed.
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。
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.
不同林龄的栓皮栎林生殖物候和生殖能力有差异，幼龄林低，老龄林高；
There are differences in phonology and reproductive ability between forests at different age.
引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。
Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.
叶、枝、根、干的灰分含量随林龄的增大有减小的趋势，而干重热值则相反；
The AC of leaf, branch, root and stem increased as the stand ages increased, the GCV of them changed oppositely.
云杉种群生物量表现出类似的增长，但林龄在30至5 0年间增长速度减慢。
The biomass of spruce population showed a similar trend, though the period of relative slow-down of growth continued from 30 to 50 years.
覆盖凋落物和去除凋落物对土壤呼吸的温度敏感性均会随着林龄的增加而增大。
Temperature sensitivity (Q10) increased with stand age in both the litter and the no litter treatments.
云南松个体生物量、种群生物量、地上生物量和地下生物量均随林龄增加而增加。
It has been observed that individual, population, aboveground and underground biomass increase with increasing stand age.
通过不同林龄木材物理性能和纤维形态、化学分析及纸浆造纸性能确定工艺成熟龄。
The technical maturity of the plantation was determined according to physical property of wood, fibre form, chemical components, and pulp characters.
不同年龄杨树各器官的碳浓度差异性显著，而不同林龄间杨树碳浓度差异性不显著。
As for the difference of carbon concentration, it was significant among different organs for all the four age groups, and not significant among the four age goups.
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。
It also shows low unit stock volume, unreasonable forest age structure, low forestland use ratio and severe pest, disease and rat disaster.
试验结果为沙棘能源林栽培技术和轮伐期的确定、为不同林龄果实加工利用的优劣状况提供了理论依据。
The results provide theoretical basis for seabuckthorn energy forest cultivation technique, determination of rotation cutting period and fruit of different ages processing and utilization.
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。
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.
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。
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.
依据大量的调查资料，应用有序样本聚类方法，按林分类型、立地条件和林龄来确定次生林改造生长量划分标准；
Based on a large amount of investigating data, the authors use cluster analysis method with ordered samples to set dividing standards for the growth rate of secondary forests rechange.
林龄单因变量的蓄积量生长模型决定系数低，引入地位指数和密度指数再次参数化的生长模型可显著提高模型拟合度。
Single age variable stock volume growth model had low coefficient of determination, but it was improved a lot by introducing site index and stand density index in reparameterization.
应用正交试验设计方法，系统分析了不同林龄、不同立地条件和不同林分密度下人工杉木林木材纤维形态的变异规律。
By using orthogonal design, this paper systematically analysed the variation law of fiber morphology of Chinese fir wood from plantations with different ages, densities and growing sites.
不同地位指数和不同林龄杉木及其林下植物的凋落物积累量也存在明显差异，杉木凋落物积累量随林龄的增大而增加。
The accumulation quantity of litter of Chinese fir forest and its undergrowth plant at different site indices and forest ages also existed obvious difference.
采用样地编年序列法，并利用生长方程计算不同林龄云南松的个体生物量、种群生物量、地上生物量和地下生物量的变化规律。
The methods of plots arranged with age and growth equation were used to calculate the individual, population, aboveground and underground biomass of Pinus yunnanensis.
土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重，其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。
The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%.
土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重，其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。
The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%.
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