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artificial forest     
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  人工林
     ~(13)C/~(12)C ratio and water use efficiency of Pinus massoniana in subtropical artificial forest.
     亚热带人工林松树~(13)C/~(12)C比率和水分利用效率
短句来源
     The conclusions show that the intercepted precipitation of Tamarind and 'Tamarindus indica +Cajanus cajan 'artificial forest are 97.9 mm and 145.4 mm,making up 17.48 % and 25.86 % of yearly total rainfall respectively.
     结果表明:罗望子人工林冠层和复合木豆人工灌木林林冠层年截留降雨量分别为97.99和145.4 mm,分别占全年降雨量水的17.48%和25.86%;
短句来源
     Dynamic analysis of growth on I-69 poplar artificial forest
     I-69杨人工林生长进程动态分析
短句来源
     By the end of 1990, there were 522 reservoirs, 2666 small reserviors, 450 thousand ha irrigation area bypumping, 3893. 0 km~2 level terraced fields, 3407. 9 km~2 artificial forest and 1085. 7 km~2 artificial grassland in Weihewatershed. The total area harnessed has reached 8466. 7 km~2, and the harnessed degree has reached 19. 0%.
     截止1990年底,渭河流域共有水库522座,塘坝2666座,引水灌溉面积45.0万ha,水平梯田、人工林、人工草有效保存面积分别为3893.0km~2、3407.9km~2和1085.7km~2,治理总面积8466.7km~2,治理度19.0%。
短句来源
     This paper studied withered leaves of artificial forest of masson pine and their quantity dynamic change of N,P,K,Ca,Mg,Al,Fe,Na,Mn,Ba,Si and Zn,totally 12 nutrient elements in the experimental plot of Qianyanzhou Station in Jiangxi Province.
     研究了千烟洲试验区马尾松人工林凋落叶及其N、P、K、Ca、Mg、Al、Mn、Na、Fe、Ba、Si、Zn等 1 2种营养元素的数量动态变化。
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  人工林地
     In the artificial forest,artificial grassland,plain sand without vegetation,up-dune and inter-dune,the monthly mean condensation water is 5.1 mm,4.0 mm,3.1 mm,1.8 mm and 1.0 mm,respectively.
     人工草地、平坦无植被沙地、沙丘顶部、丘间低地和人工林地在7~10月的平均月凝结量分别为:5.1 mm、4.0 mm、3.1mm、1.8 mm和1.0 mm.
短句来源
     Studying the Compilation Method of Ground Diameter Volume Table for Artificial Forest of Chinese Fir in Yanping District
     延平区杉木人工林地径材积表编制方法研究
短句来源
     The soil organic carbon content and storage under different types of vegetation had the trend of natural forestland >bare land> artificial forest land>farming land.
     在不同植被下有机碳含量、贮量不同,表现为自然林地>裸地>人工林地>农地.
短句来源
     2 The comparisons between soil water deficiency in natural and artificial forest land show that: (1) the concept of "forestland steady moisture capacity" is presented and defined as the lowest soil water content that can not affect the forest regular growth primarily and cause inverse succession in community.
     2 天然林地和人工林地土壤水分亏缺状况对比:(1)提出了“林地土壤稳定持水量”的概念,初步定义为“不会影响到林分正常生长、发育,不会导致群落产生逆向演替所需的最低土壤含水量”。
短句来源
     To make the balance of ecosystem carbon cycle,artificial forest area should be increased by 3.90 hm~2.
     耕地面积增加量占总土地面积的11.94%实现了最大化目标,同时满足了道路系统和水利灌溉系统以及居民点等用地的需求,而人工林地的面积必须增加3.90 hm2,也就实现土地整理前后生态系统碳量的平衡。
短句来源
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  人工森林
     STUDY ON THE MEASURMENT METHOD OF THE ECOLOGICAL NICHE OF KOREAN PINE AND LARCH POPULATION IN ARTIFICIAL FOREST COMMUNITY
     人工森林群落中红松、落叶松种群生态位计测方法的研究
短句来源
     At present this area has 6 eco-system types, the experimental results showed that for artificial forest eco-system, the animal increased nearly 10 folds, the activity of soil microbe increased 20 folds, the matter-energy transformation improved, the soil organic matter content increased near1y 10 folds, the soil pH and soil fertility improved,the small climate became better.
     试验表明人工森林生态系统类型动物增加近10倍,土壤微生物活性增强20倍,物质能量转化提高; 土壤有机质含量也增加近10倍,土壤pH和肥力都有提高,并且改善了小区气候。
短句来源
  人工林为
     The damage of larch cone flies (Strobilomyia spp.) were surveyed in matural and artificial larch forests in Wurjihan of Inner Mongolia in the summer in 1988,-and the larch cone infestation rate in natural forest is 97.0%,in artificial forest is 99.3%,and the seed infestation rates are 73.2%,82.5% respectively.
     1988年6月末至7月初,在内蒙古大兴安岭乌尔旗汗的兴安落叶松人工林、天然母树林内,对危害落叶松球果的花蝇进行了危害调查,球果受害率天然林为97.0%,人工林为99.3%,种子受害率各为73.2%、82.5%。
短句来源
     This article study artificial forest of Picea koraiensis about 18 old years.
     以18年生的红皮云杉人工林为研究对象,着重研究其冠层表面的光能分布;
短句来源
     Vertical slab polyacrylamide gel electrophoresis was used to examine inheritance of five isoenzymes (MDH,EST,SKD,GOT,PER) in megagametophytes of Taxus yunnanensis artificial forest growing in Kunming Arboretum.
     以昆明树木园云南红豆杉 (Taxusyunnanensis)人工林为研究对象 ,采用垂直板式聚丙烯酰胺凝胶电泳 ,检查了此人工林雌配子体的苹果酸脱氢酶 (MDH)、酯酶 (EST)、莽草酸脱氢酶 (SKD)、谷氨酸草酰乙酸转氨酶(GOT)及过氧化物酶 (PER)的同工酶 ,分析了此群体等位酶的遗传变异。
短句来源
     Characteristics of soil physical structure and soil moisture of five kinds of artificial forest were researched in Shengquan temple forestry center,in the southern mountain of Jinan city,in order to offer scientific management and nurture of forest vegetation in stone mountain of northern area.
     在济南市南部山区圣泉寺林场内,以5种人工林为研究对象,对其土壤物理结构和土壤水分特征进行研究,以其为北方石质山区人工林的科学经营与抚育管理提供依据。
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      artificial forest
    in an artificial forest ecosystem of North Greece, after a fire in 1982.
          
    in an artificial forest ecosystem of northern Greece
          
    Specifically, using artificial forest landscapes with various spatial structures, we estimated the relative effects of edge-induced, tree mortality (mainly due to wind) and light limitations on C dynamics.
          
    Post-fire vegetation regeneration was studied for a 6-year period in a 13-year-old-artificial forest consisting of Larix kaempferi with a dense undergrowth of Sasa senanensis.
          
    Basins HA and HB are covered with an 80-year-old artificial forest of Japanese cypress and Japanese cedar.
          
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    1、The constitution of the quick-growing and good harvest forest of Populus canadensis consists of the form of planting composition and planting distance. It de- termines the nursing and leaves' space, large or small, of forest tree, hence it in- fluences the amount of out-pat aud quality of timbers. There are differeut opinions to the proper constitution. To study it is very important. 2、In foreign countries the constitution of poplar forest is quite different. The form of planting is sometimes square or rectangle....

    1、The constitution of the quick-growing and good harvest forest of Populus canadensis consists of the form of planting composition and planting distance. It de- termines the nursing and leaves' space, large or small, of forest tree, hence it in- fluences the amount of out-pat aud quality of timbers. There are differeut opinions to the proper constitution. To study it is very important. 2、In foreign countries the constitution of poplar forest is quite different. The form of planting is sometimes square or rectangle. Some countries adopt close plant- ing, and others adopt open. In general, square and rectangle are adopted in artificial forest of Populus canadensis, while triangle planting is rearly used. A tendeucy is to use close planting. There are 400 to 40,000 planting thocks in per hectare. The difference is 100--times. 3、The rational close planting of Populus canadensis is right triangle aud square, because in such condition the orown may be normally developed, and striaght bole maintained. In the oircumstances of the same planting distance, the right triangle planting site produces 15.5% more products than thesquare (planting). Populus canadesis is a very intolerant species with high adaptability and de- mands water more than fertilizer. As the climatical and soil conditions are favourable, especially water is available and guaranteed, the density of planting may be deter- mined according to the following factors: (1) In eccordance with the table of the average height and diameter of tree in relating to the planting distance, at the first intermittent cutting, to resolve the planting distance: As the average height and diameter of the tree is known, at the first intermittent cutting, the corresponding rational distance of the first planting will be then easy found out from the table. on the other hand, the square value of the normal growing crown is used as a standard to determine the nursing spare and planting distance. In the mean time the first intermittent cutting year may be ob- tained. (2) To find out the rational close of planting by means of the soil fertility and the intensity of managenient: When the condition of soil fertility and water is suitable and the intensity of management is high, the trees grow fast the crown clo- sure is quick, open stocked in first planting is all right, dsing 3.5 × 4--6 × 6 M. in distance. If the condition of site is not good the site should be planted first close then open, using 1.3 × 1 .5--3 × 3 M. in distance promoting the crown in early closure, then thinning and transplanting the seedlings to the open site or plan- ting shrubs or farm crops between the rows of planting. (3) To find out the rational close of planting by means of the year and stan- dard of planting stocks: At the same conditions of site and management, one year seedlings or slips are used in close planting. While 2--3 year seedlings, 3--4 meters in height, are used in open planting. First close planting then open, as the plant- ing stocks grow 1--2 years 1ater, the dense stocked seedlings should be thinned and transplanted in the near by planting area. Then both sites become open stocked forests.

    加拿大杨速生丰产林的结构应着重研究杨林的配置方式和造林密度,因为它决定林木营养面积和叶面积你大小,从而影响椽木的产量和质量。作者建议采用正三角形或正方形配置,提倡稀植,每公顷277—714株,或者先密后稀,早期疏开。确定造林密度的因子,首先是依据第一次间伐时平均树商、平均胸径号造林密度关系表”确定造林密度,同时试用冠幅的平方值,作为计算林木营养面积的依据;第二是依据土壤肥力(特别土壤水分)专经营强度确定造林密度;第三是依据苗木年龄及规格确定造林密度。稀植加杨林,15年成林时,预计高达22米,胸径35厘米,每公顷木材蓄积量240—360立方米。

    Kummiug is situated in the central part of Ynnnan plateau occuping 25 01/N and 102 41'E. The altitude of the investegeted area is between 1800 - 2400M, as a result the pinus yunnanensis var pygmeae is a type of secondary vegetation, belongs to a seminaiural and artificial forest of human factors such as deforsta-tion, Overgrazing, fire and extreme rigorous natural factors,, It forms a thin and bushy growth form which is distributed in a dispersed typical habitat of the Community characterized by the euphotic...

    Kummiug is situated in the central part of Ynnnan plateau occuping 25 01/N and 102 41'E. The altitude of the investegeted area is between 1800 - 2400M, as a result the pinus yunnanensis var pygmeae is a type of secondary vegetation, belongs to a seminaiural and artificial forest of human factors such as deforsta-tion, Overgrazing, fire and extreme rigorous natural factors,, It forms a thin and bushy growth form which is distributed in a dispersed typical habitat of the Community characterized by the euphotic slopes and strong breeze, ridgy, ?thin and red soil ( regesol ) , poor soil insect clastic, there is small stone aerial land rouk out crop and the soil is erosion of piece0

    本文对地盘松在昆明地区的分布生境及其生物学性状,地上与地下,部分特征,生物量,分枝特性,针叶束和结实的数量特征等及其与年令,生境之间的关系研究的基础上进行了地盘松群落结构,生活型和经济性状的探讨。

    The skewness and kurtosis in keeping with normal distribution of the part measuring factors of the Erbai Poplar (Populus nigra var thevestina x.p simonii) artificial forest display the following laws: (1).The skewness decreases with the increasing of the breast height diameter, the tree height; increases with the increasing of the form-quotient (q_2). The skewness turns to the right side during the young stage and borders to normal condition after ten years of age. (2).The kurtosis decreases with the increasing...

    The skewness and kurtosis in keeping with normal distribution of the part measuring factors of the Erbai Poplar (Populus nigra var thevestina x.p simonii) artificial forest display the following laws: (1).The skewness decreases with the increasing of the breast height diameter, the tree height; increases with the increasing of the form-quotient (q_2). The skewness turns to the right side during the young stage and borders to normal condition after ten years of age. (2).The kurtosis decreases with the increasing of the breast height diameter, tree hight, age and form-quotient (q_2).All of the measuring factor values except the form-quotient (q_2) change from positive to negative and tend to stability eventually. They absolute values of t_1 and t_2 have been measured. They are less than 1.96, which illustrate that the distribution obey nomal distribution.

    二白杨人工林的部分测树因子以正态分布拟合的偏度与峭度呈现如下规律:(1)偏度依胸高直径、树高、林龄的增加而变小,10年后接近正态;却随形率(q_2)的增加而增大,而依胸高直径(树高、年龄)的增大相应的变小,在幼林期为右偏,约在10年后近于正态.(2)峭度亦随胸径(树高、年龄)形率(q_2)的增大逐渐减小,峰值的变化,除形率(q_2)由负到正外其它测树因子均为由正到负最后趋于稳定,(3)经测定t_1,t_2的绝对值均小于1.96,故说明了其分布均遵从标准正态分布.

     
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