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trees     
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     On Two Dewdney's Conjectures about (m, n)—trees
     关于Dewdney对(m,n)的两个猜想
短句来源
     L—POWER AND A TOTALLY ORDERED SUBSET OF TREES
     L—幂和的一类全序子集
短句来源
     QUANTITATIVE ANALYSIS OF FAULT TREES
     故障的定量分析
短句来源
     COMPLETE DIRECTED TREES ANALYSIS METHOD FOR LINEAR ACTIVE NETWORKS
     线性有源网络的完全有向分析法
短句来源
     Enumeration of All Trees of a Complete Graph——A Simplified Algorithm and its Application
     求完备图的全部——一种简易算法及应用
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  树木
     N_2O EMISSION RATE FROM TREES
     树木N_2O排放速率的测定
短句来源
     The trees whose height is less than 4.6 metre(1 levels)takes 62.8%,Those whose height in between in 4.6~10.7 metres(2 level)takes 32.3%;
     树高<4.6m(1级)的树木占62.8%,介于4.6~10.7m(2级)为32.3%;
短句来源
     In 2000(4 years after planted),the average D_(1.3),H and volume of trees were 21.18 cm,14.23 m and(0.181 5) m~3 under SDI,which were 54.5%、36.9% and 247.6% more than under NI;
     2000年(栽植第4年),地下滴灌区树木平均胸径、树高和单株材积分别达到21.18 cm、14.23 m和0.181 5 m3,比常规灌溉增加了54.5%、36.9%和247.6%;
短句来源
     N_2O Emission by Trees under Natural Condition
     自然状态下树木排放N_2O的研究
短句来源
     The spacing of trees should be 2m×1.5~3m, 1.5m×1.5m, and 1.5~3m×1.5~3m respectively. The protection mature age should be 15~16yr, 14~15yr and 12~14yr respectively.
     林带树木株行距分别为 2m× 1 5~ 3m、1 5m× 1 5m和 1 5~ 3m× 1 5~ 3m ,主栽树种的防护成熟龄分别为 15~ 16a、14~ 15a和 12~ 14a ;
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  树种
     Study on the Water Physiological Characters of Some Arbuscles and Tall Trees in Mu Su Sandland
     毛乌素沙地几种树种水分生理特性研究
短句来源
     Growth Rhythm of Ten Species of Trees and Their Environments
     十个树种生长节律与环境
短句来源
     ADAPTABLE SITE STUDIES OF SOME MAIN SILVICULTURAL TREES IN NORTHEAST MOUNTAIN AREA
     东北山区主要造林树种适生立地条件研究
短句来源
     RARE AND ENDANGERED TREES NEWLY DISCOVERED IN SHANXI
     山西稀有濒危树种的新发现
短句来源
     Cluster Analysis of Water Tolerant Trees of Huaihe River Afea of Anhui Province
     安徽淮河流域耐水湿树种的聚类分析及布局研究
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  林木
     The total carbon storages of the stand were (136.2±15.9)(mean±standard deviation) t/hm~2.The carbon storages of the trees,understorey plants,A_0 layer and soil were (74.1±8.3),(0.3±0.1),(1.9±0.2) and (59.9±14.2)t/hm~2,respectively.
     结果表明,林分总的碳储量为(136.2±15.9)(平均值±标准差)t/hm2,其中林木、林下植物、A0层以及土壤的碳储量分别为(74.1±8.3),(0.3±0.1),(1.9±0.2)和(59.9±14.2)t/hm2。
短句来源
     The net primary productivity(NPP) of the trees was (11.1±1.7)t/(hm~2·a),and the annual amount of litterfall was (2.3±0.3)t/(hm~2·a). The annual total carbon dioxide efflux measured in situ with a closed chamber method was (5.5±0.2)t/(hm~2·a).
     10年生时林木碳的净生产力为(11.1±1.7)t/(hm2·a),凋落物归还量为(2.3±0.3)t/(hm2·a),土壤CO2释放量为(5.5±0.2)t/(hm2·a)。
短句来源
     The regressive model between the crown and the diameter of trees was built as E=0.7470+0.1543D;
     建立林木冠径与胸径的回归模型:E=0.7470+0.1543D,将现实湿地松林分平均直径代入该模型,即可算出林木平均理论冠径,按照公式:S理=π.
短句来源
     The average evapotranspiration in the entire growing season was 3.1mm/d, of which,evaporation from the forest floor was 0.4mm/d and transpiration of the trees was 2.7mm/d.
     由能量平衡计算,油松林睛天的蒸发散速率为3.6mm/d,日中最大可达0.7mm/h,整个生长季平均为3.1mm/d,其中林地蒸发0.4mm/d,林木蒸腾2.7mm/d。
短句来源
     The optimum structure of shelterbelts with highest yield increasing rate,min- imum area occupied by shelterbelts and maximum protection region is crown size 2~4m~2/m~2,crown volume 4~6m~3/m~2 and stand density as 0.1~0.2 trees/m~2,tree height 8~10m.
     作物增产率最高、农防林占地比率最小、防护面积最大时,相应的最适农防林单位面积林地冠幅为2~4m~2/m~2,冠体4~6m~2/m~2,林木密度0.1~0.2株/m~2,林木高度8~20m。
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      trees
    Applications of generalized perron trees to maximal functions and density bases
          
    Solution of a research problem on trees of subsets
          
    In this paper, we solve a research problem on trees of subsets posed by F.R.
          
    We also characterize these matrices in terms of weighted, top-rooted trees.
          
    In this paper, the cardinality of maximum trees of finite sequences inM(s1,s2,...,sn) is obtained, which generalizes some of Frankl's results on families of finite sets with prescribed cardinalities for pairwise intersections.
          
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    The pine caterpiller,Dendrolimus punctatus Walker, has the habit of leav-ing the crown part of a tree and hibernating under the loose bark of thetrunk. The present paper reports the successful control of this pest by treatinga part of the trunk with a DDT suspension. All experiments were carried outat Nanking, 1947-48. When solutions and water suspension containing 5% DDT, 1%γ 666,or 5% 1068 were applied with a brush to the trunk for a width of one footand over-wintering larvae were allowed to crawl over the...

    The pine caterpiller,Dendrolimus punctatus Walker, has the habit of leav-ing the crown part of a tree and hibernating under the loose bark of thetrunk. The present paper reports the successful control of this pest by treatinga part of the trunk with a DDT suspension. All experiments were carried outat Nanking, 1947-48. When solutions and water suspension containing 5% DDT, 1%γ 666,or 5% 1068 were applied with a brush to the trunk for a width of one footand over-wintering larvae were allowed to crawl over the treated area, all theinsecticides tested were found to be effective when freshly applied. After oneweek, how-ever, only preparations containing DDT remained effective. DDTwater suspension was markedly better than DDT in kerosene, soybean oil, oracetone. Trees treated with a 5% DDT water suspension were still very toxic tothe caterpillars at the end of six weeks. The number of caterpillars crawling over a DDT-treated area would notinfluence the toxicity of the DDT film under practical field conditions. In oneexperiment all area of twenty inches square, treated with a 5% DDT suspension,still showed high toxicity to the caterpillars after 1,800 larvae had crawled overthe area in a period of nine days. Caterpillars were found to be more resistant to DDT in summer than inwinter. By increasing either the concentration of DDT to 10-15% or thewidth of the treated area to 2-3 feet, the "trunk treatment method" could beused as well in summer, if the caterpillars were beaten down to the grounedafter the trees had been treated with DDT. Under the field conditions in Nanking, 1947-48, the pine caterpilIars beganto leave the crown part of the trees and seek hibenation quarters in November.They became active again early in March, hence tree should he treated withDDT not later than the dates mentioned above. A total of 157,658 trees were treated with DDT on the Purple Mountain,Nanking, 1948. Examinations showed that larval population decreased 90-99%in the treated area, while in the check area an increase in population of16-350% had been observed.

    本文研究在松树干上涂刷有持久性的药剂以防治越冬松毛虫的可能性。1947—48年在南京试验及实施防治的结果简述如下: (一)在实验室内使越冬松毛虫爬行越过涂有一市尺宽各种药液的松树干的结果,证明5% DDT,1%γ666,与5% 1068的悬液或溶液。在涂药的当天均 有相当高的杀虫效力,惟一周以后γ666与1068完全失效,仅DDT仍保持强大的毒力。DDT水悬液显著较DDT火油、大豆油或丙酮溶液为佳。涂有5%DDT悬液的松树杆曝露田间六星期后,杀死松毛虫能力仍达100%。 (二)据试验的结果,自制的可湿性DDT,内含DDT50%,稀释剂45%,与肥皂5%,尚适宜于防治松毛虫之用。 (三)松毛虫爬行的次数对涂药面积上DDT毒力的影响极微,在二十平方市寸涂有5% DDT悬液的小面积上,9天之内经过1800头松毛虫爬行后,毒力仍未减小,死亡率尚在90%以上。 (四)夏季松毛虫较越冬松毛虫不易杀死。夏季松毛虫抵抗DDT的能力随龄期而增强。试验中显示如增加药液浓度至含DDT 10—15%,或增加涂药的宽度至2—3市尺,夏季幼虫亦能中毒死亡。故树干涂药法亦可应用在夏季防治上,惟必须在涂药后将松毛虫从树上击落,使其在爬返树冠...

    本文研究在松树干上涂刷有持久性的药剂以防治越冬松毛虫的可能性。1947—48年在南京试验及实施防治的结果简述如下: (一)在实验室内使越冬松毛虫爬行越过涂有一市尺宽各种药液的松树干的结果,证明5% DDT,1%γ666,与5% 1068的悬液或溶液。在涂药的当天均 有相当高的杀虫效力,惟一周以后γ666与1068完全失效,仅DDT仍保持强大的毒力。DDT水悬液显著较DDT火油、大豆油或丙酮溶液为佳。涂有5%DDT悬液的松树杆曝露田间六星期后,杀死松毛虫能力仍达100%。 (二)据试验的结果,自制的可湿性DDT,内含DDT50%,稀释剂45%,与肥皂5%,尚适宜于防治松毛虫之用。 (三)松毛虫爬行的次数对涂药面积上DDT毒力的影响极微,在二十平方市寸涂有5% DDT悬液的小面积上,9天之内经过1800头松毛虫爬行后,毒力仍未减小,死亡率尚在90%以上。 (四)夏季松毛虫较越冬松毛虫不易杀死。夏季松毛虫抵抗DDT的能力随龄期而增强。试验中显示如增加药液浓度至含DDT 10—15%,或增加涂药的宽度至2—3市尺,夏季幼虫亦能中毒死亡。故树干涂药法亦可应用在夏季防治上,惟必须在涂药后将松毛虫从树上击落,使其在爬返树冠时接触药剂而死亡。 (五)自然情形下,南京松毛虫在十一月即开始下树越冬,至来年三月初开始活动上树,故采用树干涂药法防治下?

    This report summarizes observations made on the performances of forty introduced guava seedling trees planted on the grounds of Fukien Agricultural College since the Spring of 1959. The seeds were received on December 10, 1947 from Dr. I. J. Condit, Citrus Experiment Station, Riverside, California, U. S. A. Among this collection of guava seedlings, four outstanding ones were selected for continued studies. These include: Fukien Agricul- tural College No. 3, for canning purposes, and Fukien Agricultural...

    This report summarizes observations made on the performances of forty introduced guava seedling trees planted on the grounds of Fukien Agricultural College since the Spring of 1959. The seeds were received on December 10, 1947 from Dr. I. J. Condit, Citrus Experiment Station, Riverside, California, U. S. A. Among this collection of guava seedlings, four outstanding ones were selected for continued studies. These include: Fukien Agricul- tural College No. 3, for canning purposes, and Fukien Agricultural College No. 9, No. 32 and No. 26 all for fresh fruits. Propagation was done readily by layering rootparts. Chinese air-layering using sphagnum moss as a rooting medium was also employed with success.

    本文是作者等三年来将美洲番石榴引种在福州试栽情况以及果实性状的报告。文中指出四株实生树即福农3号、福农9号、福农32号及福农36号等较为优良。福农3号适合为食品加工之用,其佘三号均适合为鲜果之用。

    The present paper gives a report on a study of the life his- tory of a destructive pest, Melanauster chinensis Forster, of citrus trees in Foochow during the years 1951 and 1952. It has been found that the adults lay eggs beginning from the last part of May until the end of July. Eggs are inserted in the bark of the tree trunk about 1. 4 inches from the ground. Incubation period lasts from 9 to 14 days. After hatching the young larvae feed under the bark for three or four months. In October they...

    The present paper gives a report on a study of the life his- tory of a destructive pest, Melanauster chinensis Forster, of citrus trees in Foochow during the years 1951 and 1952. It has been found that the adults lay eggs beginning from the last part of May until the end of July. Eggs are inserted in the bark of the tree trunk about 1. 4 inches from the ground. Incubation period lasts from 9 to 14 days. After hatching the young larvae feed under the bark for three or four months. In October they bore into the wood from a place about one to two inches above the ground. Overwintering of the larvae in the burrows generally begins in November or December. They resume actti- vity in March the following year. Pupation takes place abou the middle part of April. The pupal period lasts from 18 to 20 days. After emergence the adults remain in the pupal cells in the upper part of their burrows for about five to eight days. The adults appear from the middle part of May to the middle part of August. Burrows made by the larvae under the bark as well as in the wood have been studied carefully. Recommendations have been given to improve the original technique of destroying the larvae by probing with wire.

    星天牛为柑桔主要害虫之一,研究此种害虫者颇不乏人,但就所见文献中关于该虫习性的报道,多不足作为防治的有力参考。笔者有鉴及此,于一九五一至一九五二年在福州研究这一害虫的生活习性,尤其对于幼虫为害的隧道,有比较详细的观察。把果农钩杀幼虫这一防治方法的实践与理论相结合,初步掌握了幼虫在柑桔树干中钻蛀为害的规律,使过去所谓奥妙不可捉摸的钩杀技术得到了解析,同时也把这一技术从现有的水平提高了一步,希望可以为一般从事柑桔栽培工作者所掌握,成为简单易学的一件事。五月下旬至七月下旬均有成虫产卵,产卵位置平均离地面1.4寸,卵期九至十四天。幼虫孵化后即从产卵处蛀入,向下蛀食于表皮与木质部之间,其向下蛀食范围多在地面下五寸以内。一般在三、四个月后亦即在十月左右,以成熟或将成熟的幼虫,蛀入木质部内,作一隧道,准备过冬及化蛹。蛀入孔多在地面下—、二寸处。一般幼虫在十—、二月开始休眠越冬,历时约三、四个月,翌年三月以后又开始恢复活动。四月中旬开始化蛹,蛹期十八至二十天。成虫羽化后在蛹室内停留五至八天。自五月中旬至七月中旬都有成虫出现,迄八月中旬仍见有极少数成虫。幼虫所营隧道的形状、长短,都有一定的规律,文中有详细的叙述,并附有图解。

     
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