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优势杂草
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  dominant weed
     Allelopathy of aqueous extract from Ligularia virgaurea,a dominant weed in psychro-grassland,on pasture plants
     高寒草场优势杂草黄帚橐吾水浸液对牧草的化感作用
短句来源
     The species of chief grass weeds were different in different crop's field,Echijnochioa crusgalli was the dominant weed in soybean and corn field.
     各作物田内优势杂草种类不同 :大豆和玉米田优势杂草主要是稗草 ;
短句来源
     Plot trial was carried to study the effects of long-term differen t fertilization on total weed density, dominant weed species and weed biodiversity .
     通过田间小区试验,研究了长期不同施肥对田间杂草总密度、优势杂草组成及生物多样性的影响。
短句来源
     The results showed that total weed density was low, dominant weed species were less important and the weed biodiversity was high in the plots received balance d N, P and K nutrients.
     结果表明:综合施用N、P、K肥,不仅降低了田间杂草的总密度,降低了优势杂草在群落中的比重,而且有利于维持田间杂草的生物多样性;
短句来源
     Under RD,the species richness and Shannon-Wiener diversity indices decreased slightly,while Pielou community evenness indices increased markedly,indicating that the species composition of weed community was greatly improved,and the infestation of former dominant weed species was reduced.
     稻鸭共作使稻田杂草群落的物种丰富度及ShannonWiener多样性指数略有降低,但Pielou均匀度指数显著提高,表明群落物种组成有了很大的改变,降低了原来优势杂草的发生危害.
短句来源
  dominant weed species
     Plot trial was carried to study the effects of long-term differen t fertilization on total weed density, dominant weed species and weed biodiversity .
     通过田间小区试验,研究了长期不同施肥对田间杂草总密度、优势杂草组成及生物多样性的影响。
短句来源
     The results showed that total weed density was low, dominant weed species were less important and the weed biodiversity was high in the plots received balance d N, P and K nutrients.
     结果表明:综合施用N、P、K肥,不仅降低了田间杂草的总密度,降低了优势杂草在群落中的比重,而且有利于维持田间杂草的生物多样性;
短句来源
     Under RD,the species richness and Shannon-Wiener diversity indices decreased slightly,while Pielou community evenness indices increased markedly,indicating that the species composition of weed community was greatly improved,and the infestation of former dominant weed species was reduced.
     稻鸭共作使稻田杂草群落的物种丰富度及ShannonWiener多样性指数略有降低,但Pielou均匀度指数显著提高,表明群落物种组成有了很大的改变,降低了原来优势杂草的发生危害.
短句来源
  “优势杂草”译为未确定词的双语例句
     there are 51 species community combiations of weeds in which 11are of high frequency.
     优势杂草群落组合51种,出现频率较高的11种。
短句来源
     Weeding-proof experiment of 8 fine ruderal in pot culture with 5 soil treatment pesticide formula were studied,The results show:the bes effect of weeding-proof to polggonum is Kuocaoqing and Guangmieling,The weeding-proof rate is 84.2%;
     选用 5种土壤处理剂 ,对 8种优势杂草进行盆栽防除试验研究 ,结果表明 :防除酸模顺蓼的特效药剂是阔草清和广灭灵 (防效为 84 2 % ) ;
短句来源
     The yield of soybeans was influenced by the density of predominant weeds and the period of intergrowth between weeds and soybeans.
     田间优势杂草的发生密度、与大豆共生时期等严重影响窄行平作密植栽培大豆的产量。
短句来源
     The distribution and harm of species of dominant weeds of lawn vary with different area, and the most harmful weeds belong 8 families, which were Poaceae, Asteraceae, Cyperaceae, Amaranthaceae, Euphorbiaceae, Polygonaceae, Fabaceae and Caryophyllaceae, about accounted for from sixty percent to seventy percent in all weeds in lawn.
     不同地区草坪优势杂草的种类不尽相同,禾本科、菊科、莎草科、苋科、大戟科、蓼科、豆科和石竹科等8个科的杂草种类和发生数量最多,约占杂草总数的60% ̄70%。
短句来源
     However, in the plots received no P or N nutrient, the r esults were opposite.
     不施用N或P肥,田间杂草的总密度增大,优势杂草的比重也明显增强,但不利于维持田间杂草的生物多样性。
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  dominant weed
(cheatgrass) is a dominant weed that has increased the frequency of wildfire in western North America since being introduced about 120 years ago from Central Asia.
      
For dominant weed species that are difficult to control by traditional means, the development of new, selective, control methods that can be implemented in integrated pest management (IPM) is essential.
      
Differences in grapevine colonization among weed control treatments may be due to differences in mycorrhizal status and/or AM fungal species composition among dominant weed species.
      
It is a dominant weed in rotation crops because it can sprout from root pieces buried deep underground.
      
  dominant weed species
For dominant weed species that are difficult to control by traditional means, the development of new, selective, control methods that can be implemented in integrated pest management (IPM) is essential.
      
Differences in grapevine colonization among weed control treatments may be due to differences in mycorrhizal status and/or AM fungal species composition among dominant weed species.
      


This paper is a study of the rice-weed communities and the bioecological characteristic of rice-weeds in Bai Ge Zhuang of Hebei Province. The main life-forms of the weeds in rice fields are therophytes and perennial grass. Though they grow luxuriantly and have strong reproductive ability, there is a weak stage in the life cycle of every species of weed. In this stage, the nutrition of the seeds or the underground organs are exhausted at all and their strong roots haven't developed yet. This is the optimum stage...

This paper is a study of the rice-weed communities and the bioecological characteristic of rice-weeds in Bai Ge Zhuang of Hebei Province. The main life-forms of the weeds in rice fields are therophytes and perennial grass. Though they grow luxuriantly and have strong reproductive ability, there is a weak stage in the life cycle of every species of weed. In this stage, the nutrition of the seeds or the underground organs are exhausted at all and their strong roots haven't developed yet. This is the optimum stage to control the weeds. The weeds often mix with the rice to form a rice-weed community which has certain floristic composition, structure and physiognomy. As a rule, different plant communities form in different ecological conditions. But some of the rice-weed communities which have widely ecological amplitude can distribute everywhere in China. There are also seasonal dynamic and regularity of succession of the rice-weed communities. Such process is effected not only by the weed's biological characteristics, but also by environmental conditions and the artificial influence. Only when the developments of succession of communities are fully known, can the effective measures be taken to control the weeds in time.

本文研究了河北省柏各庄垦区主要的水稻-杂草群落,并对优势杂草进行了生物,生态学特性的观察。稻田杂草的生活型以一年生与多年生的为主。它们虽然生长旺盛、繁殖力强,但每种杂草在其生活周期中都有一个生长弱期,即当种子或地下越冬器官的营养物质消耗殆尽而强大的根系尚未形成之前的阶段,这一阶段是杂草的防除适期。稻田中的杂草常与水稻形成具有一定种类组成、结构和外貌的水稻-杂草群落。在不同的生态环境条件下形成不同的群落。但是有许多水稻-杂草群落生态幅度大,可以分布到全国各地。水稻-杂草群落有明显的季节变化和群落演替规律,这不仅决定于杂草本身的生物学特性,而且决定于环境条件及人为影响。了解与掌握群落演替动态,可以及时采取有效措施,控制与防止草害的发生。

The survey in the tobacco fields of the Northwest Anhui indicated that there are d3 species of weeds under 44genuses of 21 families, in which 14 species are dominant. there are 51 species community combiations of weeds in which 11are of high frequency. The survey also showed that 31. 1 % of the tobacco fields were damaged by weeds seriously.

采用五级目测法,对我省西北烟区的烟田杂草进行调查。结果表明,该烟区烟田杂草共21科,44属,53种,其中优势种14种。优势杂草群落组合51种,出现频率较高的11种。达三级以上危害较严重的田块为31.1%。

The application of special weed-killer fertilizer for wheat field was carried out in Lixiahe region,Jiangsu province The results showed that the fertilizer is effective for controlling weeds in wheat field,such as Alooecurus aequalis,Sclerochloa kengiana,Beekmannia syzigachne,Stellaris media,Galium aparine and Vincia sative.The control effects were over 90%.The weed-killer fertilizer showed obvious biological effect on wheat.It could inhibit above-growth in seedling stage and stimulate wheat growth during adult.The...

The application of special weed-killer fertilizer for wheat field was carried out in Lixiahe region,Jiangsu province The results showed that the fertilizer is effective for controlling weeds in wheat field,such as Alooecurus aequalis,Sclerochloa kengiana,Beekmannia syzigachne,Stellaris media,Galium aparine and Vincia sative.The control effects were over 90%.The weed-killer fertilizer showed obvious biological effect on wheat.It could inhibit above-growth in seedling stage and stimulate wheat growth during adult.The yield of treated wheat increased by 13.1%.

小麦除草专用肥作浅层基肥施用,可保小麦全生育期无杂草危害,对江苏里下河麦区的看麦娘、硬草、草、繁缕、猪殃殃和巢菜等优势杂草的防效均在90%以上。小麦生长呈现“前控后促”的生物效应,该效应能增强麦苗的抗寒性,促进其后期稳健生长,提高产量,增产率达13.1%。

 
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