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营养竞争     
相关语句
  nutrient competition
     Relationship Between Nutrient Competition and Differential Fruit Sizing of Feizixiao Litchi Fruit From Early and Late Blooms
     妃子笑荔枝早花大果和晚花小果与营养竞争的关系
短句来源
     however,the combined roles of allelopathy and nutrient competition may be responsible for the negative effect of G. lemaneiformis the release of allelochemicals by U.pertusa.
     ④实验初步说明,石莼可能通过相生相克作用影响共培养体系中赤潮异弯藻的生长,而相生相克和营养竞争的共同作用是导致江蓠作用的根本原因.
短句来源
  nutrition competition
     Difference and Its Mechanism of Interspecific Nutrition Competition in Different Intercropping Systems
     不同间套作系统种间营养竞争的差异性及其机理研究
短句来源
     In wheat-cotton double cropping system, there were not only disadvantage nutrition competition between wheat and cotton at underground part, but also advantage part in which the soil enzyme activity and soil nutrient content at cotton rhizosphere and non-rhizosphere zones improved.
     麦棉套作地下部不仅存在小麦对棉花营养竞争的不利一面,同时还存在小麦根系促进棉花根际非根际土壤酶活性和土壤养分含量提高的有利一面,且此效应将持续影响套作棉花一生。
短句来源
     The main reason of low abloom rate of apple were bad climatic conditions in period of differentiation of flower bud pf apple and lack of photosynthesis product of apple which caused the nutrition competition between flower bud differentiation and the flower fruit and restrained the flower bud differentiation. Those caused the most flower bud changing to leaf bud and lead the reduction of flowering rate of apple in 2005.
     运城2005年苹果成花率低,多数果园只有2004年的1/4~1/5,不少果园还出现了“空树”现象,主要是由于2004年果树的各花芽分化阶段不良气候条件以及果树光合产物不足,致使花芽分化与果树花果之间产生了营养竞争而使得果树花芽分化受到了抑制,使得果树大部分花芽转向了叶芽,从而导致了2005年果树成花大量减少。
短句来源
     Aiming at protein yield rate,the fermentation technology for single cell protein production from acidolysis maize straws was established through the experiments of product-restraining from reducing sugar,and fermentation conditions,and the symbiosis and nutrition competition between TrichodermaviridecNUA-051 and Candida utilis were taken into account. After Trichodermaviride growth 40h,2% Candida utilis culture was inoculation,aacidolysis maize straws concentration is 150g/L,(NH4)2SO4 25.0g/L,KH2PO4 6g/L,MgSO4·7H2O 0.4g/L,aeration rate 4.5L/L·min,mixing speed,600r/min,pH5~6,and temperature 35℃.
     以蛋白质得率为目标,综合考虑绿色木霉(TrichodermavirideNUA-051)与产朊假丝酵母(Candidautilis)2.281的共生特性及营养竞争,通过木霉发酵产物还原糖对菌体生长抑制的实验研究及发酵条件实验,确立了以酸解玉米秸秆为原料生产单细胞蛋白的发酵工艺:酸解玉米秸秆150g/L,木霉发酵40h接种酵母2%,(NH4)2SO425.0g/L,KH2PO46g/L、MgSO4·7H2O0.4g/L,通风量为4.5L/L·min为,搅拌转速为600r/min,pH5~6,温度35℃。
短句来源
  competition for nutrients
     Infection by plant pathogens often results in increased mortality of seedlings and adult plants, and in lower fecundity or sterility, and influences the competition for nutrients, which can induce changes in community structure and number of species and individuals.
     植物病原菌通过侵染过程导致寄主植物的幼苗及成熟个体死亡、成熟个体的种子量降低或不实 ,或造成植物个体或群落中不同物种不同程度的病害 ,影响它们之间的营养竞争 ,从而导致群落结构、物种及个体数量的变化。
短句来源
     Biological control used to be thought as antagonism against the pathogen via production of antibiotics or hydrolytic enzymes, or through competition for nutrients to inhibit multiplication and growth of the pathogen.
     过去沿用的生物防治措施的原理是通过拮抗微生物分泌的抗生素或水解酶来杀死病原物,或通过营养竞争影响病原物的繁殖和生长。
短句来源
  competition about nutrients
     Competition about nutrients between Gracilaria lemaneiformis and Prorocentrum donghaiense
     大型海藻龙须菜与东海原甲藻间的营养竞争
短句来源

 

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  nutrient competition
The experiments show that growth in multispecies cultures is regulated during the exponential stage mainly by nutrient competition, while at maximum cell densities an additional effect of inhibiting metabolic products is involved.
      
We postulate that this successional pattern is driven by interspecific nutrient competition.
      
On the other hand, soil processes are influenced by climatic change through imposed changes in soil temperature, soil water, and nutrient competition.
      
A strip-tillage production system for tomatoes (Lycopersicon esculentum Mill.) is impacted by nutrient competition from bahiagrass (Paspalum notatum Flügge).
      
canopy closure, water or nutrient competition) or in a genetically induced decline in fecundity remains to be determined.
      
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  competition for nutrients
(3) The competition for nutrients never results directly in the exclusion of the competitor from the community.
      
Under anaerobic condition, except for possible competition for nutrients, there were no significant effects of the activities of one microorganism on the other.
      
Competition for nutrients and space is believed to be the major mode of action.
      
Therefore it appears that microorganisms in slurry-amended soils require less C and energy if there is no competition for nutrients.
      
Competition for nutrients between Calluna vulgaris (L.) Hull and Molinia caerulea (L.) Moench
      
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  其他


The morphology and anatomy of abortion grains at the ear top of maize were studied. The results showed that all pistill ate florets diked before pollination at the ear top could develop with complete and maturity embryo sacs, similar to those of the middle and lower florets, although they were smaller than the latters. After pollination, however, their endosperms and embryoes developed and differentiated differently with the normal ones in beginning later and stopping earlier, less endosperm cells, starch grains...

The morphology and anatomy of abortion grains at the ear top of maize were studied. The results showed that all pistill ate florets diked before pollination at the ear top could develop with complete and maturity embryo sacs, similar to those of the middle and lower florets, although they were smaller than the latters. After pollination, however, their endosperms and embryoes developed and differentiated differently with the normal ones in beginning later and stopping earlier, less endosperm cells, starch grains and embryonic primordiums and smaller embryoes. The main cause of abortion was their poor competition abilities for nutrients with normal grains and lower proportion of substance distribution in them. The results indicated that endosperm abortion took place earlier than embryoes. Therefore, embryo development was prevented for without source of matter supply. The key period of grain abortion was just the beginning of endosperm abortion, 8-12 days and 16-21 days after pollination for the earlier and later abortion grains respectively.

通过对正常粒和败育粒胚胎发育的形态解剖观察,明确了凡是能抽出花丝的各部位小花,在授粉前基本上均可发育成完整的成熟胚囊,仅在胚囊大小上有所差别。 授粉后不同位势间胚乳和胚的分化发育存有一定差异,开始表现在时间早晚、数量多少、形态及大小不同等方面,最终导致劣势位粒(穗顶部)的败育。发生粒败育的重要原因是在发育过程中籽粒间的营养竞争和物质分配不均衡、穗顶部籽粒缺乏足够的养分所致。 籽粒败育首先是胚乳发生败育,使胚的分化发育失去了物质供应来源,胚的分化发育受阻。籽粒败育的决定时期以胚乳败育为转折点,早者在授粉后8-12天,晚者在授粉后16-21天。

An eutrophic canal in the urban area of Shanghai has been harnessed by means of establishing a new ecosystem including water-hyacinth (Eichho-rnia crassipes). In addition to the competition of water-hyacinth with algae for light and mineral nutrients, the excretion from root system of water-hyacinth can injure and abate algal cells and Hippeutis sp. (Planorbidae), a kind of mollusca living in the root zone of water-hyacinth, is feeding on algae.

应用凤眼莲生态系统治理了上海市区一条富营养化河浜,使水质改善,由于藻类生长受到控制而水变澄清。凤眼莲抑制藻类生长的作用机制除了对光和矿质营养的竞争外,主要是由于凤眼莲根系向水体分泌化合物,能伤害和清除藻类(剋制作用Allelopaihic effect)。根圈栖生的一种软体动物——水蜗牛,以藻类为食,也是凤眼莲生态系统清除藻类的一个因素。

Population densities of spider mites Eotetramn(?)chus pruni and Panonychuusulmi were compared in 10 apple orchards of varying chemical treatment levelsin Lanchou,Gansu Province in 1987.Resistance of the two spider mitesagainst 4 miticides,Kelthane、DVP、Phoxim and optunal were tested in theIaboratory.The resultes demonstrated that P.u(?)i had a higher population thanE.pruni in orchards where frequent miticide application was made,while E,prunihigher in orchards where less intensive chemical treatment was carried...

Population densities of spider mites Eotetramn(?)chus pruni and Panonychuusulmi were compared in 10 apple orchards of varying chemical treatment levelsin Lanchou,Gansu Province in 1987.Resistance of the two spider mitesagainst 4 miticides,Kelthane、DVP、Phoxim and optunal were tested in theIaboratory.The resultes demonstrated that P.u(?)i had a higher population thanE.pruni in orchards where frequent miticide application was made,while E,prunihigher in orchards where less intensive chemical treatment was carried out..pruni occupied a dominant status in abandoned orchards where no chemicalEspraying was received.The resistance test rev aled that P.ulmi had moreh stronger resistance against kelthane than E.pruni.Therefore,the boom of P.ulmiwas the consequence of selection of pesticides.The interspecific disturbanceand the competition for nutrition of the two spider mites were examined throughlaboratory and field observation.A tentative IPM program in Lanzhou appleorchards was proposed,and the prospect of the utilization of the phytos(?)iidmite T phlodrmus occidentalis in controlling spider mites on apple trees was dis-cussed as well.

通过对不同化学防治水平苹果园叶螨种群数量的调查、室内杀虫(螨)剂对叶螨相对毒性的测定以及对叶螨在苹果叶片上的分布及为害性状的考察表明:①频繁施用杀虫(螨)剂的果园.苹果全爪螨的种群数量明显大于李始叶螨种群数量;施用杀虫(螨)剂次数少的果园,李始叶螨的相对数量均高于苹果全爪螨;多年不喷洒杀虫(螨)剂的果园.李始叶螨种群数量占绝对的代势.②苹果全爪螨对三氯杀螨醇的扰性显著强于李始叶螨.③李始叶螨和苹果全爪螨在苹果叶片上存在着相互干扰.营养竞争等现象.进而证实田间大量使用三氯杀螨醇是促使兰州苹果园叶螨优势种演变的主要原因.并对压低苹果全爪螨发生基数和控制苹果园叶螨的防治对策进行探讨.

 
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