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rotation age
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  轮伐期
     It was found after 5 years,the reserved tree density of 1 275 trees/hm 2 for the first and 525 trees/hm 2 for the second would significantly hasten the diameter and standing volume growth ,improve the stand structure,and effectively shorten the rotation age.
     5a后的结果表明,前者以1275株/hm2,后者以525株/hm2的保留密度,可以显著提高林分的胸径和蓄积生长量,改善立木的径级结构,并能有效地缩短轮伐期
短句来源
     GMG/Y was markedly affected by narrow-sense heritability, additive variance at mature age, rotation age, plant-dependent cost, total budget and the time needed to produce the test plants, while diversity loss and recombination cost had rather weak effect on GMG/Y.
     狭义遗传力、加性方差、轮伐期、单株植株试验费用、总投资额等因子对年综合遗传增益(GMG/Y)有显著的影响,多样性损失对年综合遗传增益(GMG/Y)影响不大。
短句来源
     On the sites with middle and deep soil layers the recommended rotation age of oak coppice system is 3-5 years.
     在土壤为中层-厚层厚度的条件下,栎林矮林作业轮伐期以3~5a为宜。
短句来源
     and the rotation age at the 8th to 13th years was reasonable for coppice forest management of black locust.
     以培育干材和小径级矿柱材等工业用材为目的,对刺槐萌生林实施8~13a短轮伐期作业法,从经济效果最佳角度考虑是比较合理的。
短句来源
     According to the practice and management of short regulatory rotation age in larch plantation, this paper states its necessity and technique key points.
     通过对落叶松人工林短轮伐期经营与实践,提出了进行落叶松人工林短轮伐期经营的必要性,并阐述了进行短轮伐期经营的技术要点。
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  轮伐龄
     Selections should be made at age 2and 7-8 for rotation age 20, and 3, 12 and 15-16 respectively for rotation age 40.
     若轮伐龄定为40a,则采取3次选择,分别在3、12和15~16年生时进行。
短句来源
     To predict the volume at rotation age, tree height at early stagewas an approriate trait for early selection.
     对于轮伐龄材积的选择,以树高作为早期选择指标较为适宜,若轮伐龄为20a,可采取一次选择,分别在2年生及7~8年生时进行;
短句来源
  “rotation age”译为未确定词的双语例句
     On the Rotation Age of Changbai Larch(Larix olgensis) Plantations
     人工长白落叶松林采伐年龄的确定
短句来源
     Determination of rotation age of polar plantation for large-grade timber production
     杨树大径级工业用材林合理采伐年龄的研究
短句来源
     selecting fastgrowing hybrids, adopting rational spacing and rotation age are the basic measures to increase biomass and guarantee both wood quality and good economic benefits.
     选择速生杨树品种、确定合理的造林密度和轮伐年限是提高其生物产量、保证用材质量和良好效益的根本措施。
短句来源
     For the black locust in mountainous region the rotation age of ten years is recommended according to its growth pattern.
     根据山地刺槐林的生长规律,将其更新年龄定为10a为宜。
短句来源
     According to the maximum mean annual increment,the rotation age should be 38.Considering the small and middle wood used as mining timbers,posts and in housing construction in the country,the rotation age should be 20~25.According to the cost and income,the financial rotation age should be 25~ 35.In conclusion,according to the different purposes the general rotation age should be 26~30.
     根据木材用途,中、小径材的工艺成熟龄分别定为25a和20a。 根据收入和成本计算的各种经济成熟龄定为25~35a之间。
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  rotation age
We show that even in the deterministic case if the current interest rate deviates from its long-run steady state, interest rate variability may change the rotation age significantly when compared with the constant discounting case.
      
Larch Hills and Inonoaklin River were the two superior provenances with an expected gain of 13% and 10% in stem volume at rotation age of 60?years in TOLO.
      
In both cases the average rotation age is approximately 14 years.
      
The optimum biological selection age, the selection age where average annual gain is maximised, was four years for an assumed rotation age of 15 years.
      
An appropriate rotation age for sawn-timber production was found to be 8-9?years old, at which the mean annual increment of sawn timber would be maximized.
      
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This paper discussed the optimum selection ages(xmax) of height, diameter and volume in 1-69 poplar x Simon poplar and 1-69 poplar x Nigra poplar F1 clones, using annual genetic gain(△Gt) and expected genetic gain(Gt) as the evaluation criteria, and the stability of their early selection result was tested. Age of early selection might be as ealy as 2 years after plantation(not including plantation age) in 1-69 poplar x Simon poplar Ft clones. Age of early selection was 3~4 years after...

This paper discussed the optimum selection ages(xmax) of height, diameter and volume in 1-69 poplar x Simon poplar and 1-69 poplar x Nigra poplar F1 clones, using annual genetic gain(△Gt) and expected genetic gain(Gt) as the evaluation criteria, and the stability of their early selection result was tested. Age of early selection might be as ealy as 2 years after plantation(not including plantation age) in 1-69 poplar x Simon poplar Ft clones. Age of early selection was 3~4 years after plantation(including plantation age) in 1-69 poplar x Nigra poplar F, clones. Selection for these two F1 clones at these ages would represent that at rotation ages, and genetic gain of the selection would achieve the maximum value. Therefore, it was concluded that early selection would be effective.

本文以年遗传增益(△G_t)和期望遗传增益(G_t)为评定尺度,分别讨论了Ⅰ-69杨×小叶杨和Ⅰ-69杨×欧洲黑杨F_1无性系树高、胸径和材积的最佳选择年龄(x_(max)),利用聚类分析的方法对早期选择效果的稳定性进行了检验。Ⅰ-69杨×小叶杨F_1无性系的早期选择年龄可早至定植后2年 (包括定植年龄),Ⅰ-69杨×欧洲黑杨F_1无性系早期选择年龄在定植后3年(不包括定植年龄)。在这些年龄对无性系进行的选择能够代表轮伐年龄的选择,并且选择的遗传增益将达到最大。研究结果表明,黑杨派新无性系的早期选择是有效的。

A series of methods for long-term timber forest planning and investment decision making are provided in this paper. Based on market forecasting, an objective model is established to achieve optimal equal-annual-payment and lower access cost. Various factors such as regional location, site class, management intensity and timber assortment are taken into consideration. By derterming comprehensive economic evaluatuon coefficients in various conditions, the objective investment scale and reson-avle allocation can...

A series of methods for long-term timber forest planning and investment decision making are provided in this paper. Based on market forecasting, an objective model is established to achieve optimal equal-annual-payment and lower access cost. Various factors such as regional location, site class, management intensity and timber assortment are taken into consideration. By derterming comprehensive economic evaluatuon coefficients in various conditions, the objective investment scale and reson-avle allocation can be reached. The economic rotation age is caculated. By using a dynamic model, many relations such as planning and decision making, long-term and shart-term objectives, forest resources, reforestation, timber production and social demand are all properly handled. A quantative method for analysing capital supply is introduced so that production structure, ownership, location and project evaluation are all linked together.

本文论证了以市场需求为导向,以增大等额年金收入、节约采运成本为目标的规划方法。通过确定各地区、各立地条件、各经营强度下生产某材种并运输到销区的综合经济评价系数来优化投资规模,合理布局用材林基地。提出了最佳经济轮伐期的计算方法。以动态规划联接投资,逐步实现长远规划目标。提出了资金来源定量分析方法,把资金来源同生产结构、所有制、区域、工程项目评价联系起来,从而为制定制度化、法律化的硬化投资来源方法提供了依据。

By surveying the biomass, determining the wood property and examining the economic benefits of plantations of poplar hgbrids P-15A, 1-24 and Sacrau, it was found suitable that short-rotation culture of poplats is used to produce pulpwood in the region where we made the investigation. selecting fastgrowing hybrids, adopting rational spacing and rotation age are the basic measures to increase biomass and guarantee both wood quality and good economic benefits.

以P-15A杨、I-214杨和沙兰杨为材料进行试验研究。通过对其生物产量的调查、材性指标的测定和经济效益的计算资料进行分析研究,我们认为所研究地区进行杨树短轮伐期栽培以生产造纸原料是适宜的。选择速生杨树品种、确定合理的造林密度和轮伐年限是提高其生物产量、保证用材质量和良好效益的根本措施。

 
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