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油松
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  chinese pine
    The Quality Control Technology of Chinese Pine and Oriental Arborvitae Forests in Mountain Areas of Beijing
    北京山区油松、侧柏林质量调控理论与技术的研究
短句来源
    Analysis of Eecological Benefits of Transformation of Pune Chinese Pine Stands
    油松纯林改造的生态效益分析
短句来源
    Studies on Young Stand Quality and Forest Soil Fertility of Chinese Pine and Arborvitae
    油松、侧柏人工幼林质量与林地土壤肥力的研究
短句来源
    Study on Dynamic Economic Threshold of Damage to Chinese Pine Forests by Gansu Zoker
    甘肃鼢鼠对油松危害动态经济阈值研究
短句来源
    Related Analysis Between the Growth of Chinese Pine and Climatic Factors in Loess Hilly Region
    黄土丘陵区油松生长与气候因子相关分析
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  “油松”译为未确定词的双语例句
    Primary Study on the Mechanism of Ovule Abortion of Female-sterile Clone in Pinus Tabulaeformis Carr.
    油松雌性不育系胚珠败育机制的初步研究
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    Studies on the Modulation Mechanisms of Water Consumption of Water Capacitance and Xylem Cavitation and Embolism in Three Tree Species
    油松侧柏元宝枫蒸腾耗水的空穴栓塞和水容调节机制
短句来源
    A STUDY ON BIOSYSTEMATICS OF PINUS TABULAEFORMIS
    油松生物系统学的研究
短句来源
    STUDY OF THE INTERRELATIONSHIP BETWEEN PINE AND MAPLE IN THE MIXED STAND WITH ~(32)P
    应用~(32)P研究混交林中油松和元宝枫的相互关系
短句来源
    MULTIVARIATE ANALYSIS ON GEOGRAPHICAL DIFFERENTIATION OF PINUS TABULAEFORMIS
    油松种群地理分化的多变量分析
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  chinese pine
Chinese pine caterpillar (Dendrolimus tabulaeformis) larvae were fed with pine needles of different degrees of damage to evaluate the effects of pine needles on the growth and development of larvae.
      
The damaged pine needles significantly affected the population dynamics of Chinese pine caterpillars.
      
Spatial variability of throughfall in a Chinese pine (Pinus tabulaeformis) plantation in northern China
      
Because of the special characteristic of Chinese pine (Pinus tabulaeformis), and the lower droopy branches, negative values for interception account for only 13% of the total samples.
      
Effect of laser pretreatment on germination and membrane lipid peroxidation of Chinese pine seeds under drought stress
      
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Summary It is hard to obtain seeds from Pinus koraiensis crossed with P. tabulae for mis. According to the cytological investigations on both pines, the developments of each macrospore and microspore, the fertilization, the number of chromosomes and the causes of failure to get seeds, indicate that the incompatibility exists in these two species of pines. 1.The interval between pollination and fertilization of P. koraiensis is almost exactly 12 months, but that of P. tabulaeformis is 13 months. After the pollination...

Summary It is hard to obtain seeds from Pinus koraiensis crossed with P. tabulae for mis. According to the cytological investigations on both pines, the developments of each macrospore and microspore, the fertilization, the number of chromosomes and the causes of failure to get seeds, indicate that the incompatibility exists in these two species of pines. 1.The interval between pollination and fertilization of P. koraiensis is almost exactly 12 months, but that of P. tabulaeformis is 13 months. After the pollination has taken place, both the pollens stay at the pollen chamber of the tip of nucellus and will germinate until the average temperature is above 22 pollinations take place while the female gametophyte is still in a free nuclear stage. The mitosis of the central cell and the body cell of the pollen tube are at the some time, which in P. koraiensis is 102 days before fertilization, and which in P. tabulaeformis is 7days. 2.There is a big difference between the number of chromosomes of P. koraiensis and that of P. tabulaeformis. Chromosomes in the microspore mother cell of P. koraiensis is n=6, those of P. tabulaeformis is n=12; chromosomes in the endosperm cell of P. koraiensis is n=6, 70, those of P. tabulaeformis is n=12, n=14. As for the number of chromosomes the crossing of P. koraiensis with P. tabulaeformis is rather difficult. 3.The main cause of the incompatibility between P. koraiensis and P. tabulaeformis is the pollen of P. tabulaeformis showing poor or no germination in the nucellus of P. koraiensis. The ovule of P. tabulaeformis stopped its development at the free nuclear stage and is similar to the development of the ovule of P. koraiensis which is not fertilized.

紅松和油松杂交是不易得到种子的。我們試图从研究紅松和油松的大、小袍子发育、受精过程、染色体数目,来寻求其杂交不孕的原因。試驗結果是: 1.紅松由传粉到受精間隔12个月,油松則間隔13个月。二者在授粉后,花粉貯存于珠心頂部的花粉室內,平均溫度約22℃时开始发芽。发芽的花粉在花粉室內越冬,翌春花粉管继续伸长,至6月中旬受精。 2.紅松和油松的染色体数目相差很大,紅松小孢子母細胞內n=6,油松小孢子母細胞內n=12;紅松胚乳細胞內n=6,个别的細胞內也有n=7,8,…,10的,油松的胚乳細胞內則是n=12,也有n=14的。由染色体数目差别之大,也可推知紅松和油松杂交是有困难的。 3.紅松和油松杂交不孕的主要原因是,油松的花粉不能在紅松的珠心上发芽。授以油松花粉的紅松,其胚珠发育至游离核时期即停止发育,与未授粉的紅松胚珠发育很相似。

It is said that Pinus massoniana Lamb, which growing in the Kwangtung province is of two forms, i.e., one possessing more resin and the other with less resin. In the present paper, both the wood structure and the physico-mechanical properties of the two form timbers which were collected from the northern part of the province have been preliminarily studied. They are about thirty years old. According to the wood anatomical characteristics, these forms may be distinguished as follows: the first form comparing...

It is said that Pinus massoniana Lamb, which growing in the Kwangtung province is of two forms, i.e., one possessing more resin and the other with less resin. In the present paper, both the wood structure and the physico-mechanical properties of the two form timbers which were collected from the northern part of the province have been preliminarily studied. They are about thirty years old. According to the wood anatomical characteristics, these forms may be distinguished as follows: the first form comparing with the second form has wider ring-width, lower late-wood percentage, thinner tracheid-wall thickness and larger lumen-width, shorter tracheid-length, more rays and more radial resin ducts, less in numbers of tangential wall pits on late-wood tracheids, shallowly dentate ray tracheids, and more window-like pits per cross-field. Above all, the ring width and the tracheid length are the salient features. Among the physico-mechanical properties of the two forms of timbers, only both the strength in tension parallel to the grain and the shearing strength parallel to the grain have reliable differences. Moreover, the strength index, the strength/weight ratio and the height-growth rate are higher in the second form than which in the first one. In comparison with the race from other localities, the Masson pine timbers grown in the northern part of Kwangtung are the strongest in the main strength properties.

本文初步研究粤北乐昌大源林区近30年生馬尾松两个变型——“油松”和“糠松”的木材构造和物理力学性貭。依照木材解剖特征,将两个变型区别如次:油松的輪寬較大,晚材率較小,管胞壁厚稍小而腔闊稍大,管胞长度較短,木射线略多与径向树脂道較多,此外軸向管胞切向壁上具緣紋孔数目較少,射线管胞內壁鋸齿发育程度較浅,交叉場紋孔数目略多;糠松則相反。两者的主要差异为輪寬与管胞长度。油松与糠松两者的木材物理力学性貭,仅順紋拉力和順紋剪力有可靠的差异。此外,后者具有稍高的强度指标、貭量系数以及較大的树高生长。又粤北馬尾松木材的貭量系数,远胜他地同种松木,其主要力学指标較高,生长較快。

Biomass production of pinus tabulaeformis plantations in Tai Yue MountainShanxi province was determined.Data of 8 sample plots from stands of differentdensities were collected for analysis.Current biomass production of parts aboveground was 57. 5T/ha in average,and that of 24-year plantation was 79. 6T/ha.Mean annual growth was 7.8T/ha,net assimilation 0.885T/ha/yr, and relativerate of growth was 16.8%. Productivity of the plantation is considered to beof middle level. As shown by regression,relative growth...

Biomass production of pinus tabulaeformis plantations in Tai Yue MountainShanxi province was determined.Data of 8 sample plots from stands of differentdensities were collected for analysis.Current biomass production of parts aboveground was 57. 5T/ha in average,and that of 24-year plantation was 79. 6T/ha.Mean annual growth was 7.8T/ha,net assimilation 0.885T/ha/yr, and relativerate of growth was 16.8%. Productivity of the plantation is considered to beof middle level. As shown by regression,relative growth rate of stands is closely correlatedwith density of the plantation. A maximal value was found in stands withdensity of 6000 stems/ha,while that of stand with density 20,000 stems/hawas in minimum.Relation of relative growth rate to leaf area ratio and netassimilation rate can be expressed by following equations. RGR = 3. 5028NAR-0. 1488 r= 0. 997 RGR = 0. 1859LAR-D. 1746 r= 0. 989 Over density is a factor holding back the current growth of the plantation.Form growth analysis indicated that plantation should be thinned at 13-15years of age.

用八块不同密度林分的资料,分析了太岳山人工油松林的生物量,22年生油松林地上部现存量平均为57.5吨/公顷,24年生的平均为79.6吨/公顷。年生长量为9.8吨/公顷,净同化率平均为0.885吨/公顷/年,相对生长率平均为16.8%,生产力属于中等水平。 根据树干解析及回归估计确定的生长量,对油松林进行生长分析试验,分析的结果表明,不同密度油松林的相对生产率不同,密度在6000/公顷时,相对生长率最大,20000/公顷林分的相对生长率较小,即相对生长率因密度的增加而减少,相对生长率与叶面积比及净同化率的关系可由下式表达: RGR=3.5028NAR-0.1488 r=0.997 RGR=0.1859LAR-0.1746 r=0.989 “过密”已不利于太岳油松林现阶段的生长,从生长过程分析中可以推断,太岳山穴播的油松林在13—15年时即应进行抚育。

 
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