timber yield

Regulation goal with maximum timber yield could realized by implementation of the scheme.

模型运行所得优化方案今人满意、预期可实现调整目标，并获得最大木材收获量。

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Investigation and Study on Transformation of Low Yield Timber Forest

低产用材林改造的调查研究

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The proportion of timber production from plantation in the total timber yield in China is becoming larger and larger.

森林采伐逐渐由天然林为主过渡到以人工林为主，人工林生产的木材在木材总产量中的比重也越来越高。

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On the whole, thinning utilization was not worth-while in the respect of timber yield and economic benefit.

总之，间伐利用在木材产量和经济效益上均不大合算；

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According to the forecast equations of biomass and stand growth, commercial timber yield table of main stand factors, stand stem and various specifications had been compiled, which were at 6 planting densities and 14~ 20 site indexes.

依据生物量和林分生长预测方程，编制了6种不同造林密度、14～20指数级林分主要测树因子、林分树干和各种规格商品材生物量的生长过程表。

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The percentage of plywood timber to total yield decreases with increase of planting density in the site indices 14,16 and 18 m;

胶合板材产量随立地指数的增大而增大，且占总产量的百分比在立地指数为14、16、18m时，随造林密度的增大而减小；

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The percents of ground wood pulp timber yield to total yield and chemical pulp timber yield to total yield increase with increase of planting density in site indices 14,16 and 18 m;

在立地指数为14、16、18m时磨木浆材产量占总蓄积量的百分比和化学浆材产量占总蓄积的百分比均随造林密度的增大而增大；

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In the producing area of south china, Chinese fir accounts for46% of the total commercial timber yield.

在我国南方杉木产区，其木材产量约占全国商品材的20%。

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The second one is the structure of tree species and the third class is the structure of age classes, their objectives are the maximum of total net revenue and of total timber yield respectively.

第2级树种结构优化模型的目标为各树种的纯收益之和最大；第3级龄级结构优化模型的目标为调整期内总收获量最大。

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By the technologies of well-bred species breeding, matching species, reasonable structure and site adjusting, the plantation can be planted generally, and it can replace natural forest on timber yield.

通过良种繁育、适地适树、合理结构及立地调控技术，全面营造人工用材林，在木材生产上实现人工林替代天然林。

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The price of timber yield increased 950 yuan/ hm 2 every year.

每年每公顷木材生长可增加产值950元。

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The first is that only a few bamboo species have been exploited, and the second is that the timber yield is still low which has prevented the development of bamboo industry.

首先是竹种利用单一，尤其是竹板材加工几乎完全依赖毛竹；其次是竹林产量偏低，竹原料供需矛盾突出，严重制约了竹材利用的产业化进程。

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Based on this Critical Value, combined with the situation of forest re-sources, timber yield can be determined.

根据临界值并结合森林资源状况确定木材生产量。

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