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forest
相关语句
  林木
    Water condition is reluctantly satisfied for the requirement of tree growth in forest zone.
    森林带的水分条件可满足林木成材对水分的需求,林木采伐后土壤水分可得到很好恢复;
短句来源
    The effects of different intercrop modes and densities of poplar with grain on growth of poplar and net benefit were studied by field experiments and statistical analysis. The results showed that poplar intercropping with grain increase forest growth as well as agriculture income,providing theoretial basis for the technology spreading of intercropping poplar and grain.
    通过进行相同密度不同林龄间作试验、相同林龄不同间作模式对林木生长的影响试验、杨树轮伐期内不同间作模式经济效益对比、不同间作密度对杨树生长影响试验 ,分析了杨粮间作的经济效益 ,得出了杨粮间作对提高林木生长量、提高农业收入具有重要作用 ,为开展杨粮间作技术推广提供了理论依据。
短句来源
    The results showed that slope runoff head loss was related to slope gradient,forest density,net rainfall intensity and slope length. The relationship of water head loss with the distance among trees and the diameter at the ground of tree was E∝(D/b)~(4/3).
    结果表明,坡面径流水头损失与坡面坡度、林木密度、净雨强、坡长等有关,水头损失与林木间距(b)和树木地径(D)间的关系为:E∝(D/b)4/3;
短句来源
    Rainfall Collecting Techniques and Soil Moisture Environment for forest Growth
    集水技术与林木生长的土壤水环境研究
短句来源
    At present, studies on soil water displacement pursue mostly pure farmingland and pure forest field, and it has less study on agri-forestry system of its soil water movement. Ifthere are some, most study the impacts of soil water content on forest growth, crops growth or itsproductivity.
    目前,关于土壤水分运移的研究,绝大多数是针对纯农田或纯林地的,农林复合生态系统土壤水分运动的研究还很少,且大都局限于探讨土壤含水量对林木生长、作物生长以及产量的影响等。
短句来源
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  林地
    Study of Sediment Yield from Slope and Gully Erosion After Reclamation of Forest Land
    林地开垦后坡沟侵蚀产沙关系的研究
短句来源
    Results show that the reference 137Cs content is 1870 Bq/m2.Average erosion intensity is 4468 t/(km2·a) in cultivated land and 1759 t/(km2·a) in forest land.
    研究结果表明:该流域137Cs含量的背景值为1870 Bq/m2; 流域内坡耕地、林地的年平均侵蚀强度分别为4468、1759 t/(km2.a);
短句来源
    The reference Cesium-137 inventory of study area is 1 870 Bq/m2.Mean annual net soil losses were 4 468 t/(km2·a) of slope cultivated land and 1 759 t/(km2·a) of forest land.
    研究得出该流域137Cs含量的背景值是1870 Bq/m2; 流域内坡耕地、林地的年均侵蚀强度分别是4468 t/(km2.a)和1759 t/(km2.a);
短句来源
    Numerical analysis of soil fertility degradation in the reclamation process of forest land on low hilly red soil
    低丘红壤林地开垦利用过程中土壤肥力退化的数值分析
短句来源
    Changes of Natural (13)~C Abundance in Light Fration in Cleared Maolan Karst Forest Soils Converted to Maize Cropping
    林地变为玉米地后土壤轻质部分有机碳的(13)~C/(12)~C比值的变化
短句来源
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  林分
    If planted forest With high quality on the loess plateau,it will reduce sand over 30 %of the total silt discharge.
    如果林分具有良好的结构,黄土高原建造植被的减沙潜势为30%以上。
短句来源
    Physiochemically, the soil for high - yield forest is slightly acidic to neutralwith a texture of light loam to light clay. Unit weight less than 1. 35 and organic mattercontent more than 1. 5%.
    高产林分的土壤其主要理化指标为:微酸性至中性,质地由轻壤至轻粘,容重小于1.35,有机质大于1.5%,土层厚度在60cm以上。
短句来源
    The function of soil and water conservation of plant cover was studied for different forest stand and structural layer.
    为科学合理地营造水土保持林 ,从不同林分类型、不同结构层次研究了植被系统的蓄水保土功能 ,结果表明 ,乔木冠层对降水具有较强的截持能力 ,其大小因林分类型不同而异 ,以桦木林最强 ,马尾松、华山松最弱 ;
短句来源
    Soil erosion resistance ability of forest lands in silting coastal area of northern Jiangsu province was strong. The anti erodibility and anti scouribility of top soil in most forest lands was the highest.
    苏北沿海防护林土壤抗侵蚀能力强 ,多数林分表土抗蚀性和抗冲性高 ,而深层土壤可蚀性差。
短句来源
    Results showed that the soil microbial biomass was more sensitive than soil organic matter and total nitrogen content in reflecting the bio remediation effect of different forest types at different growing stage on the degraded latosol earth ecosystem.
    结果表明 :微生物生物量较土壤有机质、全氮能更灵敏地反映不同林分类型和不同种植年限对土壤的修复作用 .
短句来源
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  “forest”译为未确定词的双语例句
    Study on the Initial Soil and Water Conservation Benefits of Yangtiz River Protective Forest
    长江防护林(四川段)初期水土保持效益研究
短句来源
    Land cover types had significant effects on sediment yield of slope. At the same time,the amount of sediment could be decreased 71.05%-95.58% if the forest cover rate reached 70%-80%.
    土地覆被状况对于泥沙的产生有重要影响,同等条件下,若林地土地覆被率达到70%~80%,则能够减少71.05%~95.58%的泥沙产生量。
短句来源
    As for 3 kinds of main land use types,wood forest,economic forest and paddy field account for(40.53%),18.35% and 18.50% of the total land area respectively.
    用材林、经济林和水田分别占被淹没土地总面积的40.53%、18.35%和18.50%,是主要土地类型。
短句来源
    DIVERSITY OF FOREST SOIL ANIMALS IN THE EASTERN MOUNTAIN REGIONS OF CHINA
    中国东部山地森林土壤动物多样性
短句来源
    FRUIT FOREST SOIL DEGRADATION OF GUANYANG COUNTY, GUANGXI AND ITS SUSTAINABLE DEVELOPMENT
    广西灌阳县果林土壤退化与可持续发展
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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An investigation was made on soil and water conservation work in the mountainous areas in part of communes and brigades in the five counties of Chaoyang District. Experiences were derived from a large amount of data. They can be summarized in three combinations and five changes, that is, combining soil and water conservation with water conservancy projects, biological measures with engineering projects and large projects with medium and small ones so as to implement step by step the transformation of mountainous...

An investigation was made on soil and water conservation work in the mountainous areas in part of communes and brigades in the five counties of Chaoyang District. Experiences were derived from a large amount of data. They can be summarized in three combinations and five changes, that is, combining soil and water conservation with water conservancy projects, biological measures with engineering projects and large projects with medium and small ones so as to implement step by step the transformation of mountainous area into gardens and forests, the terracing of land in gullies and that on hillsides, the irrigation of cultivated land and the formation of a communication line network. This is the only way which will lead the population in Chaoyang District to prosperity.

本文对朝阳地区五个县的部分社队以水土保持为中心的山区建设进行了重点调查研究,从大量的丰富的实际资料中总结出“三结合五化”经验,即坚持水土保持与水利建设相结合,生物措施与工程措施相结合,大巾小工程相结合,以逐步实现山区园林化、沟壑川台化,坡地梯田化、耕地灌溉化和交通路网化。这也是朝阳地区广大人民由穷变富的必经之路。

Over Three hundred thousand kilograms of masson pine seeds were needed for afforestation by aerial sowing in Guang Xi each years. The top amount reached four hundred and fifty thousand kilograms in some years. Most of the seeds were collected by people and purchased by the forest departments. The quality and the-class of seeds must be appraised and divided in the shortest time during purchasing. According to the inspection method of the forest seeds(Ministry Standard), the rectilinear correlative...

Over Three hundred thousand kilograms of masson pine seeds were needed for afforestation by aerial sowing in Guang Xi each years. The top amount reached four hundred and fifty thousand kilograms in some years. Most of the seeds were collected by people and purchased by the forest departments. The quality and the-class of seeds must be appraised and divided in the shortest time during purchasing. According to the inspection method of the forest seeds(Ministry Standard), the rectilinear correlative relation between viability and germination percentage was found while doing a research for the correlated coefficient of the viability and germination percentage in masson-pine seeds. Set up a rectilinear equation then calculated the correclated coefficient of the viability and the germination percentage, it is very useful to the seeds bussiness activties.

广西每年飞播造林需要马尾松种子30万千克以上,有些年份高达45万千克。而大部分种子领先群众采集,林业部门收购,在林木种子经营活动中,收购种子需要在最短时间之内鉴定出种子质量等级,所以,根据林木种子检验方法(部颁标准),对马尾松种子生活力与发芽率相关系数作了研究,发现存在直线相关关系,建立直线方程,计算出生活力与发芽率之间的相关系数,在林木种子经营活动中是很有实用价值意义的。

From April, 1988 to December, 1992, 8 investigations on soil beetles are conducted under the vegetations of Pinus massoniana,laurilignosa and aestilignosa, Pinus taiwanensis and shrub-meadow of Jiuhua Mountains respectivcly.417 specimens were collectd, which belong to 33 families. Among them, 220 individuals are larvas, which belong to 15 families; 197 individuals are adults, which belong to 28 families, 64 species (genera).The average density is 705 individuals/m3. Melolonthidae(L) and Elateridae(L)are dominant...

From April, 1988 to December, 1992, 8 investigations on soil beetles are conducted under the vegetations of Pinus massoniana,laurilignosa and aestilignosa, Pinus taiwanensis and shrub-meadow of Jiuhua Mountains respectivcly.417 specimens were collectd, which belong to 33 families. Among them, 220 individuals are larvas, which belong to 15 families; 197 individuals are adults, which belong to 28 families, 64 species (genera).The average density is 705 individuals/m3. Melolonthidae(L) and Elateridae(L)are dominant genera. 18 kinds are common genera, which belong to Curculionidae(L), Staphylinidae(L), Platystethus operosus (A) and Longitasus succinens (A), etc.With increase of elevation, the habitat condition emerges vertical changes obviously,which results in the difference on the community structure of soil beetles. The richness,evenness and domiance indexes of community composition are all higher under the vegetations of mixed forest and shrub-meadow, than those under the vegetations of Pinustaiwanensis and Pinus inassoniana; the difference is considerable among each community composition, Jaccard similarity index is small. Species (genera) which appears in only one habitat are more, but the common species (genus) are fewer. Changes of individual number are not totally identical with genera number. The density of soil beetles under the vegetation of Pinus taiwanensis is higest, which is 1083.2 individuals/m3 averagely,however, the density under Pinus massoniana is lowest, which is 652.8/m3, But the seasonal changes of number in each habitat are different,the number under Pinus taiwanensis is more only in winter,and fewer in other seasons;numbers under shrub-meadow and mixed forest are steadier.As regards seasonal changes of species(genera) number and individual number of soil beetles, the general trend is winter>artumn>spring>summer.The individual number of larva is 2 times more than adult’s.but the individual number of adult's is 2.5 times more than larvat's in mixed forest.The law of vertical distribution of soil beetles in soil bed is obvious,that is,many genera and individuals centralize in A layer, and obviously decreasing downwards.Individual numbers in A layer constitute 56.8% averagely. This is not same in four seasons, the individual number of A layer is the most in summer, constitutes 67.5%; in spring is lowest, constitutes 38.3%. Families which mainly distribute in A layer are Staphylinidae(A),Curculionidae(A),Chrysomelidae(A),Leiodidae(A),Tenebrionidae(A), Monommatidae(A),Scaphidiidae,Silphidae (L) etc. Genera which only distribute in D layer are very few, only Dermestidae (A) and Hydrophilidae (L).

1988年4月—1992年12月先后8次对九华山4种生境的土壤甲虫进行了调查,共获标本417头,隶属33科。其中幼虫15科;成虫28科64种(属)。平均密度705头/m3。不同生境土壤甲虫群落组成的差异较大,仅分布于一种生境的种属多,共有的少。群落组成的丰富度(S)、均匀度(E)和香农指数值(H)均以灌丛草甸和混交林内高,黄山松林和马尾松林低,优势度指数值(C)正好相反。组成和数量的季节变化表现为冬季>秋季>春季>夏季。幼虫个体数一般是成虫的2倍。垂直结构明显,A层(0—5cm土壤深度)个体数占全捕量56.8%,向下骤减。夏季表聚性强,占67.5%,春季最小,占38.3%。

 
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