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middle-age forest
相关语句
  中龄林
     Among the middle-age forest (4~7 years), the lumber is suitable to make paper with the requested length by 0.6~1.0 mm, such as blotting paper and so on. The mature forest (8 years and above) is suitable to make paper with the requested length by 0.8~1.1 mm, such as manifold paper and so on.
     中龄林(4~7a生)木材适合造要求纤维长度为0.6~1.0mm吸墨纸等纸,成熟林(8a生以上包括8a生)木材适合造要求纤维长度为0.8~1.1mm打字纸等纸。
短句来源
  “middle-age forest”译为未确定词的双语例句
     2. The species composition, the colony density and Shannon-Wiener indices of the middle-age forest and the younger growth, the nursery and the pure orchards are as lower as wheat fields in seventeen vegetations.
     2.在中、幼龄杨树林地、苗圃、单一品种果园等纯林林地(果园),鸟种组成、群体密度、Shannon-Wiener多样性指数,与小麦农田生态系统一样,在17种植被类型中较低;
短句来源
     Eleven species of ectomycorrhizal fungi were collected from Mongol Scotch Pine forest. Suillus grevillei, Suillus granulatus, Pisolithus tinctorius are the dominated species in artificial young-age forest, and Russula and Gomphidius rutilus dominates in middle-age forest.
     林间调查采集外生菌根菌11种,幼林中以厚环乳牛肝菌(Suills grevillei)、点柄乳牛肝菌(Suillus granulatus)、彩色豆马勃Pisolithus tinctorius为优势种,中龄林中以红菇类(Russula spp.)
短句来源
     Therefore, it is important to research biomass and carbon pool of young and middle-age forest. There is the close relationship between forest biomass and fixed carbon of forest ecosystems.
     森林生物量与森林生态系统的固碳能力密切相关,生物量与碳储量的多少直接影响到森林生态系统的功能,因而生物量与碳储量问题成为不同尺度生态学研究的热点。
短句来源
  相似匹配句对
     In the Middle
     人在中途
短句来源
     middle contradiction;
     存在中间矛盾;
短句来源
     MIDDLE AGE
     中年风韵
短句来源
     It is middle Pleistocene in age.
     年代地层单位属中更新统。
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     Middle-school students'
     但是,学校
短句来源
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In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences...

In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences of annual volume increments among the age groups are significant, and it is demonstrated that the abormentioned standard is scientific and reasonable. Perhaps this standard is better than that in the"some technical rules of investigating forest resources" issued by the Ministry of Forestry of China in 1982.

本文收集99株220年生红松的材积连年生长量材料,采用聚类分析方法,对我国天然红松林合理划分龄组问题进行了探讨。研究结果是:幼龄林1—80年,中龄林81—140年,近熟林141—160年,成熟林161—200年,过熟林201年以上。方差分析和多重比较的结果表明,相邻龄组间林木连年生长量差异显著,又与中华人民共和国林业部1982年颁发的《森林资源调查主要技术规定》中天然红松林龄组划分标准相比较,均证明本文划分标准比较科学合理。

A investigation on harm of gnawing animals to the forest shows as follows.The degree of harm to the northern forest is more serious than to the southern forest, to timber forest than to economic forest, to young age forest than to middle age forest. The rate of gnawing harm of timber forest is between 3.98%~8.92%,death rate 4.10%~8.62%,those of economic forest are 2.74%~4.38%and 0.45%~1.11% respectively,the gnawing rate of young age 5.05%~14.62%,death rate...

A investigation on harm of gnawing animals to the forest shows as follows.The degree of harm to the northern forest is more serious than to the southern forest, to timber forest than to economic forest, to young age forest than to middle age forest. The rate of gnawing harm of timber forest is between 3.98%~8.92%,death rate 4.10%~8.62%,those of economic forest are 2.74%~4.38%and 0.45%~1.11% respectively,the gnawing rate of young age 5.05%~14.62%,death rate 15.58%~26.70%,those of middle age forest are 2.02%~4.25% and 0~0.64% respectively.

调查发现,延安地区啮齿动物对林区的危害度,北部比南部大,用材林比经济林大,幼龄林比中龄林大;用材林啃伤率为3.98%~8.92%,死亡率为4.10%~8.62%;经济林啃伤率为2.74%~4.38%,死亡率为0.45%~1.11%;幼龄林啃伤率在5.05%~14.62%,死亡率为15.58%~26.70%;中成龄林啃伤率为2.02%~4.25%,死亡率为0~0.64%。

The carbon cycle ,especially the CO 2 emission and uptake by the middle age and near mature Abies fabri forests was studied in this paper .The forest CO 2 source and sink were emphatically analyzed .Based on the data of located observation on the east slope of Gongga Mountain, the following aspects were investigated in the middle age and near mature Abies fabri forests: the storage of plants carbon , soils organic carbon , litter and dead standing tree carbon, photosynthetic rates...

The carbon cycle ,especially the CO 2 emission and uptake by the middle age and near mature Abies fabri forests was studied in this paper .The forest CO 2 source and sink were emphatically analyzed .Based on the data of located observation on the east slope of Gongga Mountain, the following aspects were investigated in the middle age and near mature Abies fabri forests: the storage of plants carbon , soils organic carbon , litter and dead standing tree carbon, photosynthetic rates of the plants and respiration rates of the plants and soils by CI-301 photosynthesis system. The results show that the total carbon storage of the near mature forest was 320.966 t/hm 2,of which , the storage of plant carbon ,soil organic carbon, litter and dead standing tree carbon accounted for 172.740, 143.152, 1.786 and 3.288 t/hm 2, respectively. The total carbon storage of middle age forest was 98.465 t/hm 2, of which ,the storage of plant carbon, soil organic carbon, litter and dead standing tree carbon accounted for 57.966, 30.698, 1.504 and 8.297 t/hm 2, respectively. CO 2 was released which a rate of 21.749 t/hm 2· a from the soil of the near mature forest. CO 2 was released with a rate of 12.320 t/hm 2· a from the soil of the middle age forest. The results also show that there was an increasing in carbon storage of the middle age and near mature forests from atmospheric CO 2.The main factor which affected soil respiration was temperature.Finally ,the uncertainties in the estimations were discussed in detail and further works were also suggested.

根据定位观测数据和有关历史资料,研究了贡嘎山东坡峨眉冷杉(Abiesfabri)近熟林和中龄林C循环。测定了两种林分植物C储量、土壤有机C储量、凋落物和立枯量中的C储量,并对两种林分的净光合速率进行了对照研究。

 
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