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林木
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  forest
    CHARACTERISTICS OF ROOT, STEM, AND SOIL RESPIRATION Q_(10) TEMPERATURE COEFFICIENTS IN FOREST ECOSYSTEMS
    林木非同化器官与土壤呼吸的温度系数_(10)值的特征分析
短句来源
    Study on the shear strength of forest root-loess composite.
    林木根系与黄土复合体的抗剪强度试验研究
短句来源
    In recent 10 years, 2400 km2 of soil loss area have been harnessed, with a newly built area of terraces and irrigated field of 300000 hm2, economic forest increases from 28400 hm2 to 76000 hm2, forest cover from 13% to
    近十年治理水土流失面积2400km~2,新建梯田和发展水地30.14万hm~2,经济林由2.84万hm~2发展到7.6万hm~2,林木覆盖率由13%提高到21%,商品经济和乡镇企业都得到迅速发展,初步改变了贫困落后面貌。
短句来源
    the southwest of China, including 15species fruit trees, 9 ornamental plants. 7 forest trees. 4 leguminous plants and 1 food crop.
    四川有36种植物表现缺铁症,其中包括15种果树,9种观赏植物,7种林木,4种豆科植物和1种粮食作物。
短句来源
    After 10 years of experiment and technological spreading it is shown that in an area of 410mm precipitation per year,when anti-seepage technical treatments are taken on the slopes, and each tree has a water-collecting area of 8 m2, the forest belt of 2m2 can collect 570 to 1270 mm of rainfall, thus increase survival rate to 98% and increase tree growth by 40% to 80%.
    10年试验研究和大面积示范结果表明,在年降水量410mm左右地区造林,林地坡面经过不同的防渗处理,当每株树具有8m~2的集水面时,可使2m~2的植树带内收集到570~1270mm降水,造林成活率最高达到98%,林木生长量可提高40%~80%.
短句来源
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  forest tree
    FOREST TREE BIOTECHOLOGY──THE PRESENT SITUATION ANDPROSPECT
    林木生物工程的研究现状与展望
短句来源
    As an useful tool of forest tree breeding and gene transfer,genetic linkage map gives new development to the study of forest genetics and forest tree breeding,and also makes early selection of forest tree possible.
    首先,遗传图谱的构建,是林木育种和基因转移的有利工具,使森林遗传学和林木育种学研究产生了新的飞跃,还为林木早期选择,提高选择效果,缩短选育周期提供了可能;
短句来源
    This paper reviewed the research on nutrition genetics and its genetic improvement of forest tree, including genotype differences of exploiting soil phosphorus, mechanism of adaptation to lowphosphorus stress, genetic control of phosphorus efficiency, screen and selection of germplasm for lowphosphorus tolerance.
    本文结合国内外植物营养遗传和改良研究成果,就林木有效利用土壤P素的基因型差异、对低P胁迫的适应机理、P效率的遗传控制、耐低P种质资源筛选和新品种培育等进行述评。
短句来源
  forest trees
    the southwest of China, including 15species fruit trees, 9 ornamental plants. 7 forest trees. 4 leguminous plants and 1 food crop.
    四川有36种植物表现缺铁症,其中包括15种果树,9种观赏植物,7种林木,4种豆科植物和1种粮食作物。
短句来源
    Pseudopsyra bilobata Karny is a new pest which damage fruit trees, forest trees, flowers and plants in Nanning.
    双叶拟缘螽是为害果树、林木、花卉较严重的一种新害虫。
短句来源
    In view of the current resource and environment problem, the authors suggest that phosphorus efficiency should be considered as an important breeding objective. It is necessary to conduct genetic improvement of nutrition utilization efficiency (NUE) of main forest trees to realize the sustainable development of plantation with low supply and high output. 
    基于资源与环境问题考虑,作者认为P效率应作为一个重要的林木育种目标,加强我国主要造林树种以P效率为主的营养利用效率遗传改良,以达到低投入、高产出、无污染的人工林可持续发展目标。
短句来源
  “林木”译为未确定词的双语例句
    Study on Physical Mechanism of Interface between Root System and Loess Soils
    林木根系与均质土间相互物理作用机理研究
短句来源
    Studies on the Insect Community Structure in Different Vegetation in the Cultivation Areas of North China Plain
    华北平原耕作区不同林木类型昆虫群落结构研究
短句来源
    The results of the study showed that compared with the original chinese pine,the runoff and soil erosion on woodland without litter,clear land with bush,grass and litter cover and farmland are increased by 3.6,2.7,5.5 times and 15.4,8.4,949.9 times,respectively.
    结果表明,与原状油松林相比,林地去掉枯枝落叶层、采伐上层林木保存草灌和枯枝落叶层、采伐林木开垦为农地的地表径流量分别增加了3.6,2.7和5.5倍; 土壤侵蚀量分别增加了15.4,8.4和949.9倍。
短句来源
    The Relation between Soil Water Deficiency and Vegetation Growth in Northern Shaanxi Loess Plateau
    陕北黄土高原土壤水分亏缺状况与林木生长关系
短句来源
    The Effect of the Several Kind of Litters to the Roughness Coefficient
    几种林木枯落物对糙率系数n值的影响
短句来源
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  forest
Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS.
      
Growth Model System for National Continuous Forest Inventory
      
A Growth Model System is developed for data updating and forecasting of the national continuous forest inventory.
      
Its design is based on the inherent forest growth laws, and its parameters are estimated by modern regression methods.
      
It is suitable for forest resource information updating and forecasting for a large region, e.g., a province.
      
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  forest tree
This paper presents a brief review of traditional methods of studying genetic variation in forest tree species and introduces a new, integrated population genomics approach.
      
Therefore, only the heterotrophic part of tree biomass determines annual carbon losses in a forest tree population.
      
According to genetic variation parameters, three out of six populations (Akdagmadeni-Yozgat, Refahiye-Erzincan and Vezirkopru-Samsun) appear to be preferable populations for genetic conservation and forest tree breeding programs.
      
Plant parasitic nematodes from a forest tree nursery in southern Spain with some notes about the influence of soil storage on th
      
___TAGSTART___BR___TAGEND___A nematological survey was carried out in a forest tree nursery in Andujar, southern Spain.
      
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  forest trees
The results showed that the forest trees grew in a clumped pattern in the stage dominated by the pioneer trees, and that the trees were distributed in a random pattern in the stage dominated by the companion trees or in the mature stage.
      
From population genetics to population genomics of forest trees: Integrated population genomics approach
      
Reducers in the Plant Debris of Wild Fruit and Forest Trees and Shrubs on Sandy Lands in the Semidesert Zone of Stavropol Krai
      
Since the shola forest trees are characterized by their short stature with low to medium girth, about 89% of the total number of deadwood is of the size ranging from 10.1 cm to 40.0 cm in diameter.
      
Some progresses of transferring and expressing Bt toxin gene in forest trees are offered with a discussion on the limits and future prospects of using Bt products in forestry.
      
更多          


The mineralogical composition of a soil catena of dark brown forest soils derived from granite in the Xiao Hinggan Mountains was investigated in relation to weathering proccess under the conditions of warm-cool humid climate and the different relief. It was found the acid eluviation proccess in soils was getting weaker from the upper slope downwards under the bioclimatic condions mentioned above. The minerals were generally weathered in the following sequences: biotite acid-weakly acid dioctahedral Al-(interlayer)...

The mineralogical composition of a soil catena of dark brown forest soils derived from granite in the Xiao Hinggan Mountains was investigated in relation to weathering proccess under the conditions of warm-cool humid climate and the different relief. It was found the acid eluviation proccess in soils was getting weaker from the upper slope downwards under the bioclimatic condions mentioned above. The minerals were generally weathered in the following sequences: biotite acid-weakly acid dioctahedral Al-(interlayer) vermiculite weakly acid-neutral secondary chlorite; plagioclase and microcline weakly acid smectite or interstratified minerals of smectite-kaolinite group. Under the coniferous-deciduous mixed forest, humus was accumulated distinctly in horizon A, where vermiculitization of biotite was less intensive because of the complexation of humic acid with free aluminium and iron. At the same time, the proccess of acid eluviation was appeared in horizons AB and B, where the breakdown of feldspars and the transformation of biotite into Al-(interlayer) vermiculite occured to a great extent. In the horizon C remained detritus, biotite and smectite-kaolinite interstratified minerals. In consequence, the hydroxyl aluminium from the clay minerals was the main reason for potential acidity of the soils. It was also found that the type and growth of the forests on the soils were closely related with the clay mineral composition of the soils and their chemical environment conditions.

本文研究了温凉湿润地区不同地形条件下花岗岩母质上的山地暗棕色森林土土壤链的矿物风化。结果表明,由阳坡岗顶、中部到阴坡下部,酸性淋溶由强变弱。原生铝硅酸盐矿物蚀变为次生的粘土矿物:黑云母酸—弱酸性→二八面体Al(层间)蛭石弱酸—中性→Al绿泥石;微斜长石→蒙皂石;斜长石弱酸性→高岭石或蒙皂石一高岭石类矿物的混层物。在针阔混交林作用下,A层腐殖酸与铝、铁络合,铝蛭石化过程弱。AB和B层黑云母和长石蚀变强,矿物晶层间羟基铝积累,阳坡岗顶Al(层间)蛭石和蒙皂石化,形成了较高的土壤潜在酸度;阴坡下部除Al蛭石外,并有成土Al绿泥石形成,潜在酸度低。含有蒙皂石的C层,层间铝有积累。矿物蚀变和晶层Al转移,是山地暗棕色森林土酸度的主要来源。红松林类型和林木生长情况与土壤粘土矿物学特性及其化学环境条件密切有关。

This paper deals with the changeable laws of extractions of humic substance and aggregate in plow layer under the plastic films for several vegetables, cotton and nursery stocks. Three years' experiment resuits show: 1. The carbon of total humus in plow layer soil under plastic films is less than that of in check among the three states carbon containing in total humus carbon, the percentage of the tight state is the highest, that of the joining state is lower and that of the free state is the lowest. 2. Under...

This paper deals with the changeable laws of extractions of humic substance and aggregate in plow layer under the plastic films for several vegetables, cotton and nursery stocks. Three years' experiment resuits show: 1. The carbon of total humus in plow layer soil under plastic films is less than that of in check among the three states carbon containing in total humus carbon, the percentage of the tight state is the highest, that of the joining state is lower and that of the free state is the lowest. 2. Under plastic films, the percentage of the tight state carbon is increased along with the increase of the content of total humus carbon in the soil. the free state carbon is lower than that of in the check, 3. The percentage of the tight state carbon in plow layer soil in the total humus reached the significant or extremely significant standard by various of T value. 4. Under plastic films, the percentage of each size levels aggregates in plow layer soil in the total soil weight is higher than that of in check. The results of potted planing in the net house are basically similar to that of the experiments in the fields.

本文主要筒述在覆膜条件下,几种蔬菜作物、棉花、林木幼苗,对耕层土壤腐殖质组分与土壤团聚体的影响规律。试验结果表明:(1)覆膜栽培生长后期测定耕层土壤总腐碳均低于对照处理,三种形态碳占总腐碳的百分数相比较,紧结态最大、联结态次之,游离态最小。(2)覆膜处理,紧结态碳占总腐碳的百分数随土壤中总腐碳含量增加而增加,覆膜处理游离态碳均低于对照处理。(3)耕层土壤紧结态碳占总腐碳的百分数、各处理间T值实测结果,达到了显著,极显著标准。(4)覆膜处理耕层土壤各级团聚体占总土重的百分数均高于对照处理。纲室试验结果与田间试验结果一致。

A notable achievement has been made in the afforestation for soil and water conservation at the head of Dujiangyan irrigation since 1981. About 347 thousand trees have been afforested on 435 hectares. Besides the ability of conserving soil and water, part of the trees have been cut down, meanwhile make up excess the wood needs of local project. The afforestation initially shows economic, ecological and social benefits. The office of Dujiangyan afforestation has been elected as a model unit by the committee of...

A notable achievement has been made in the afforestation for soil and water conservation at the head of Dujiangyan irrigation since 1981. About 347 thousand trees have been afforested on 435 hectares. Besides the ability of conserving soil and water, part of the trees have been cut down, meanwhile make up excess the wood needs of local project. The afforestation initially shows economic, ecological and social benefits. The office of Dujiangyan afforestation has been elected as a model unit by the committee of Chengdu afforestation since 1982. Their experience is: the leaders take the matter seriously, and forest manage depends on law and mobilizing voluntary afforest, meanwhile, they pay attention to publicize the importance and strengthen of the afforestation result.

自1981年都江堰渠首的水土保持和绿化工作开始以来,成绩显著。在荒滩上造林4.35公顷,营造各种树木347,000余株,这些林木除具有保水保土作用外,部分林木已开始间伐,补充了部分工程用材,且自给有余,初步显示出生态效益、社会效益和经济效益。1982年以米,都江堰绿化办公室连续被成都市绿化委员会评为先进单位。他们的经验是:领导重视,思想统一,以法治林,巩固成果,狠抓全民义务植树。

 
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