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根系主要
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  main roots
     Roots are distributed within 60 cm underground soil layer, lateral roots fully develop and main roots grow down to 1.6 m underground.
     根系主要分布在距地表 60 cm内的土层中 ,侧根发达 ,主根随发育年龄提高逐渐向下生长 ,可深达 1.6m
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  “根系主要”译为未确定词的双语例句
     70 % root distribute in 0cm- 30cm soil layer. The root was not discoved under depth of 70 cm.
     70%的根系主要集中分布在0cm-30cm的土壤中,70cm以下土壤未发现有根系生长。
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     The root system of The forest growing by the ditch (diameter<1mm and lmm
     生长在沟边的林木,其根径<1mm和1.2mm的根系主要分布在土壤表层,在0-30cm土层内的根量百分比分别为80.0%和77.6%,而在0-40em土层内则上升为92.3%和87.3%。
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     The results showed that: root system of vegetation mostly distributed in 0~100 cm depth of soil, in this layer of soil contained 92.77% of total roots biomass.
     结果表明:植被根系主要分布在0~100cm土壤中,占总根系生物量的92.77%以上。
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     The depth and range of root distribution were affected by soil texture.
     根系主要分布在地表下10~90cm的土层内,根系分布的深度和广度受土壤质地影响.
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     Study on the Main Ecological Effects of Wheat Root Systems
     小麦根系主要生态效应的研究
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  相似匹配句对
     The biological properties were as follows: (1) Well developed roots.
     其主要的生物学特性是:(1)根系发达。
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     the root systems of the both locate in the main layer more than a half.
     根系主要分布层比重过半。
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     The following are the main results:
     其主要结果为:
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     The main results were as follows:
     主要研究结果:
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     Defoliation and root rottingbecome progressively serious as the disease advances.
     根系腐烂。
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  main roots
Experiments were performed on the first and second internodes and 4-cm-long apical segments of main roots of pea (Pisum sativum L.) seedlings, grown in the light and decapitated above the second node on the seventh day after seed germination.
      
Distribution of arsenic and cadmium, based on their concentrations of unit dry matter, in tea plants grown on un-contaminated soil was in the order: feeding roots>amp;gt;stems≈main roots>amp;gt;old leaves>amp;gt;young leaves.
      
At the end of the period both species had almost the same number of main roots: C.
      
thwaitesii had 28 main roots with a mean length of 45.74 cm and diameter of 3.68 mm and C.
      
rotang had 25 main roots with a mean length of 38.70 cm and diameter of 2.8 mm.
      
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Chemical analysis of seperate plant organs of green manures at various stages of growth collected from representative districts of Central China showed that the accumulation of green mass and the absorption of nutrients chiefly occurred during the last 30 to 45 days before plowing-under.Astragalus sinicus,the principal leguminous green manure in central China,showed some correlation in P and K contents with soil fertility,whereas the nitrogen content remained practically constant regardless the nutritive status...

Chemical analysis of seperate plant organs of green manures at various stages of growth collected from representative districts of Central China showed that the accumulation of green mass and the absorption of nutrients chiefly occurred during the last 30 to 45 days before plowing-under.Astragalus sinicus,the principal leguminous green manure in central China,showed some correlation in P and K contents with soil fertility,whereas the nitrogen content remained practically constant regardless the nutritive status of the soil.It was esti- mated that the nodular bacteria of Astragalus sinicus assimilated about 105 kg of nitrogen per hectare at the yield of 37,500 kg of green mass. Green-house experiments revealed that manure crops possessed a stronger power in assi- milating their phosphorus from rock phosphate and magnesium from serpentine as compared with winter wheat.Laboratory experiments with exciled root also demonstrated that the root systems of manure crops have a stronger absorption power,greater cation-exchange capacity,larger absorbing surface area and more intensive rate of respiration than that of the wheat.Among the tested manure crops,Raphanus sativus,a cruciferous plant widely planted on infertile soils,has been proved the best variety.

1.紫云英与苕子的绿色体一般以初花期前后或盛花期增长最快。紫云英的根系主要分布在0—10厘米,在5,000斤鲜草产量时,1平方尺内约有6克左右的干根。地上与地下部分的干物质比为6.5∶1,鲜重比为11∶1,目前一般对地下部分的产量估计似乎有些偏高。2.紫云英等含氮、磷、钾的百分率均随绿色体的增长而减低,紫云英在盛花期含 N2.7%,P_2O_5 0.65%,K_2O2.5%,CaO 1.6%,含氮量与土壤的肥沃程度没有明显的相关性,含磷量与含钾量则与土壤中磷钾含量成正相关。根部所含的养分一般均低于地上部分,叶子的氮、磷百分率远较茎等部位为高。苕子盛花期含 N 3.3%左右,其他成分大体与紫云英相近。萝卜菜在盛花期的含 N 量为1.7%,K_2O 量较高,一般是 N 与 P_2O_5的总和,含 CaO量恒多于紫云英,一般在2.0%以上。油菜的成分大体与萝卜菜相近。3.各种绿肥在一定生长时期中地上部分的阳离子总量大体为一常数。紫云英在盛花期的阳离子总量维持在110毫当量左右,萝卜菜的含量还更高。4.萝卜菜、紫云英、苕子与小麦等四种植物对蛇纹石都能利用,但对钾长石不能利用。磷灰石的施用对增产很显著,根据...

1.紫云英与苕子的绿色体一般以初花期前后或盛花期增长最快。紫云英的根系主要分布在0—10厘米,在5,000斤鲜草产量时,1平方尺内约有6克左右的干根。地上与地下部分的干物质比为6.5∶1,鲜重比为11∶1,目前一般对地下部分的产量估计似乎有些偏高。2.紫云英等含氮、磷、钾的百分率均随绿色体的增长而减低,紫云英在盛花期含 N2.7%,P_2O_5 0.65%,K_2O2.5%,CaO 1.6%,含氮量与土壤的肥沃程度没有明显的相关性,含磷量与含钾量则与土壤中磷钾含量成正相关。根部所含的养分一般均低于地上部分,叶子的氮、磷百分率远较茎等部位为高。苕子盛花期含 N 3.3%左右,其他成分大体与紫云英相近。萝卜菜在盛花期的含 N 量为1.7%,K_2O 量较高,一般是 N 与 P_2O_5的总和,含 CaO量恒多于紫云英,一般在2.0%以上。油菜的成分大体与萝卜菜相近。3.各种绿肥在一定生长时期中地上部分的阳离子总量大体为一常数。紫云英在盛花期的阳离子总量维持在110毫当量左右,萝卜菜的含量还更高。4.萝卜菜、紫云英、苕子与小麦等四种植物对蛇纹石都能利用,但对钾长石不能利用。磷灰石的施用对增产很显著,根据增产百分率的大小,可排列成如下的次序:紫云英>萝卜菜>苕子>小麦。在某种程度上反映植物对难溶性物质的利用能力的三个指标(根的阳离子交换量、根的吸收面积与根的呼吸强度),对于四种植物,其大小次序基本上与其对磷灰石的利用能力的排列次序相一致。因此从各方面来看,这几种绿肥的吸收养分的能力,都较象小麦这样的农作物为强。5.绿肥是一种成本低收效大的肥料。在紫云英鲜草产量5,000斤时,地上与地下部分所合的氮、磷、钾分别相当于硫酸铵105斤、过磷酸钙22.5斤、氯化钾36斤。假定其中的氮素有2/3是来自大气,则“天然工厂”制造了70斤左右的硫酸铵。中稻亩产600斤时所取走的氮素约相当于50斤硫酸铵,因此单就来自大气中的这一部分来讲,对中稻的供应也还是有余。从全国范围来看,凡是绿肥面积大的地区,也就是稻麦产量高而稳定的地区。目前各地绿肥的种植面积与产量都极不平衡,还有很大的潜力。

Root systems and above ground biomasses of 33 Chinese fir sample trees were studied. Results showed that the distribution of Chinese fir roots depend on soil bulk density and system of cultivation. The root of Chinese fir is aerobic and intolerent to waterlogging. It prefers fertile soil but is weak in competition with other plants.

本文记述了在杉木根系研究中采用的方法——重量法。按照这一方法于1973—1979年间在苏南丘陵区调查了33株2—20年生杉木的根系及地上部分生物产量。研究结果表明: 一、丘陵区杉木根系分布的特点具有明显的浅根性,根系主要集中分布于0—20厘米的土层内(占根量的80%);根系分布因土壤容积重和营林措施的不同表现出一定程度的可塑性,即土壤容积重愈大,根系愈集中土壤表面,地上部分生长愈差,深翻能减轻土壤容积重,促进杉木根系分布位置有一定程度的下移。 二、杉木根系具有明显的趋肥性、好气性、怕水渍和与杂草竞争能力弱等生态特性。 三、杉木根量(ω)的大小与树高(H)之间呈幂函数关系:(ω=3.430H~(1.3686) 四、杉木地下与地上部分生物量之间的比例关系(地下:地上=1:y),随树高(H)而变,呈对数曲线关系:y=0.3067+3.5321lgH。 掌握了杉木树高与根量,树高与地下和地上部分的比例关系后,只要测出林分平均高就能粗略地计算出林分的生物产量。

Crownvetch belongs to Leguminosae, Coronilla. It isa perennial forage plant, coldness and drought resistant and high temperature tolerant. Its regene ration and reproduction rates are high, with great mulching. It is nutritive in composition. The nutritive Values of crownvetch are higher than that of alfalfa for ruminants. It can be used in soil conservation, or can be used as green manure and garden plant. The growth period is 210—245 days. The first seedlings come out on late march, the secondary seedlings...

Crownvetch belongs to Leguminosae, Coronilla. It isa perennial forage plant, coldness and drought resistant and high temperature tolerant. Its regene ration and reproduction rates are high, with great mulching. It is nutritive in composition. The nutritive Values of crownvetch are higher than that of alfalfa for ruminants. It can be used in soil conservation, or can be used as green manure and garden plant. The growth period is 210—245 days. The first seedlings come out on late march, the secondary seedlings grow in the period of full bloom. It can survive safely at the atmospheric temperature of-20.8℃ in winter and 36.4℃ in summer. The optimum temperatures of growth is 20-23℃. Its growth begins on late March, flowering in late May, Seeds ripen in late July. Its flowering period is long. The flowers and pods of those which come in bloom after August are fall off severely. The crownvetch begins to wilt the end of November to middle December. It grows rapidest from late May to middle June, averaging 1.95cm increase per day. Growth intensity is highestin early June and late August. The height of the plant reaches 60cm before bloom the leaves are maximal in number, and Then they fall off severely. The first cut of the forage crop in Taigu begins in late May. 3—4 times per year, Fresh weigbt yield is 8—10 thousand catties per mu. The root is divided to 5 classes, root system is composed of the 3—4 Classes mostly. The root weight is 3.34 catties Per squaremeter(2226.9 carries permu). The weight of the aerial part is 6.14 times that of the root. wherever the lateral root reaches anewplant grows. Root nodules are very many, by which the organic matter and nitrogen nutrition of the soil can be increased. Crownvetch hos many toxic compounds, but they cause no trouble to the ruminant animals, when rabbits fed crownvetch hay at a 60% dry matter basis they grow and make weight gains.

多变小冠花(Coronilla varia L.)为豆科小冠花属(Coronilla)半蔓生性多年生牧草。它抗寒、抗旱、耐热再生性好,繁殖力高、复盖度大、营养成分好。对反刍家畜的营养价值与消化率(78%)不低於紫花苜蓿(71%)。此外还可以护坡、保持水土,以及作绿肥、观赏用。多变小冠花全生育期110—145天,生长期210—245天。一年内可出现两次生长苗,第一次幼苗在3月下旬出土,盛花期时地面又长出第二次幼苗。气温在零下20.8℃和36.4℃时植株能安全越冬越夏,生长最适温度为20—23℃。在太谷3月下旬返青,5月下旬开花,7月下旬种子成熟。花期长,8月份以后开的花不能结实成熟,花荚脱落严重。11月底到12月中地上部分枯萎,青草期长。 5月下旬到6月中旬生长最快,平均日增长1.95厘米。6月上旬和8月下旬生长强度最高。开花前株高60厘米左右时,叶量最多,以后落叶严重。第一次刈割应在5月下旬开始,太谷一年可刈割3—4次。亩产鲜草0.8—1万斤或更高。草丛最高可达135厘米。多变小冠花根分五级,根系主要由第3、4级组成,一平方米根重3.34斤(折每亩2226.6斤),地上部是地下部的6.14倍。根蘖...

多变小冠花(Coronilla varia L.)为豆科小冠花属(Coronilla)半蔓生性多年生牧草。它抗寒、抗旱、耐热再生性好,繁殖力高、复盖度大、营养成分好。对反刍家畜的营养价值与消化率(78%)不低於紫花苜蓿(71%)。此外还可以护坡、保持水土,以及作绿肥、观赏用。多变小冠花全生育期110—145天,生长期210—245天。一年内可出现两次生长苗,第一次幼苗在3月下旬出土,盛花期时地面又长出第二次幼苗。气温在零下20.8℃和36.4℃时植株能安全越冬越夏,生长最适温度为20—23℃。在太谷3月下旬返青,5月下旬开花,7月下旬种子成熟。花期长,8月份以后开的花不能结实成熟,花荚脱落严重。11月底到12月中地上部分枯萎,青草期长。 5月下旬到6月中旬生长最快,平均日增长1.95厘米。6月上旬和8月下旬生长强度最高。开花前株高60厘米左右时,叶量最多,以后落叶严重。第一次刈割应在5月下旬开始,太谷一年可刈割3—4次。亩产鲜草0.8—1万斤或更高。草丛最高可达135厘米。多变小冠花根分五级,根系主要由第3、4级组成,一平方米根重3.34斤(折每亩2226.6斤),地上部是地下部的6.14倍。根蘖芽发达,凡侧根所到之处均可长出新根。根瘤繁多,可以增加土壤有机质和氮素营养。多变小冠花含有多种有毒物质,它们对反刍家畜无害。其中所含β-硝基丙酸对单胃家畜有严重毒害,但鲜草不超过日粮三分之一或全部用半干草(含水量42%)喂家兔,生长发育正常。对单胃家畜应注意饲喂方法。目前我国引种的多变小冠花形态特性不一,青草和种子产量悬殊,应根据种植目的进行品种整理和筛选。

 
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