查询词典 poplar

The attracting activity of the extracts of withered black poplar leaves: Volatiles from withered leaves of black poplar, extracted by steam distillation and dichloromethane, strongly attract adults of Agrotis, ypsilon, Spodoptera exigua and Herculia glaucinalis in the field bioassay, but are less attractive to CBW.

黑杨萎蔫叶片粗提物的诱虫活性采用水蒸汽蒸馏和二氯甲烷萃取，提取黑杨萎蔫叶片的挥发性物质。

Anoplophora glabripennis Motshulsky (Coleoptera: Cerambycidae) is one of the most destructive insect borers of poplar trees in China. In recent years millions of poplar trees were damaged to death or near death in"Three-North Area", which caused heavy losses economically, ecologically and socially. Through the study on host selecting behaviors and behavioral responses to plant volatiles of A.

中文题名光肩星天牛对寄主植物挥发性物质的行为反应及作用机理的研究副题名外文题名 Behavioral responses and mechanism of Anoplophora glabripennis to host volatile compounds 论文作者李建光导师尹伟伦骆有庆金幼菊教授学科专业植物学研究领域\研究方向植物与昆虫的关系学位级别博士学位授予单位北京林业大学学位授予日期2001 论文页码总数129页关键词森林病虫害光肩星天牛寄主选择挥发性物质馆藏号BSLW /2003 /S763 /6 光肩星天牛Anoplophora glabripennis是我国最重要的一种林木蛀干害虫。

Cytospora chrysosperma harms the poplar widespread,and it affects severely on the tree species of development of poplar and willow.

杨树烂皮病又名杨柳腐烂病，是杨、柳树的主要枝干病害之一。病害发生在主干和枝条上，表现为干腐和枯梢2种类型。

The inducing of Dothiorella gregaria cell wall degradation product-oligosaccharides to the resistant index of poplar cell were studied with the poplar callus.

以杨树愈伤组织为试验材料，研究了杨树溃疡病菌细胞壁裂解物——低聚糖对杨树细胞有关抗病指标的诱导作用。

Funalia gallica, Lenzites tricolor, Polyporellus brumalis, Pseudotrametes gibbosa, Pycnoporus sanguineus, tested their degrading ability to david poplar wood lignin, measured the lignin content change of david poplar wood after a period of time degraded by 6 wood rot fungi, which is the first study on the biodegradation mechanism of lignin by wood white rot fungi.

本项研究选择了火木层孔菌及另外5种木材分解能力较强的阔叶树上的白腐菌：粗毛盖菌、三色革裥菌、冬拟多孔菌、偏肿拟栓菌和血红密孔菌，研究了它们对山杨木材木质素的分解能力，测定了经6种白腐菌分解一定时期的山杨木材木质素的含量，作为木材白腐菌对山杨木材木质素生物降解机制的初步研究，旨在为山杨木材生物制浆造纸提供应用基础理论研究，同时也可为木质素合理的生物转化为有用的化学品、生物漂白、酶处理防止机械浆的返黄、废水治理、纤维素酶解糖化的微生物前处理等提供相关的借鉴研究，以期在生产实践中减轻环境污染并充分利用木质素资源。

The results indicated that sclerotia was an important sign and a necessary stage in the formation of the fruit body;light,temperature and humidity were the key factors;"Beiqi"residue can stimulate the forming of the sclerotia and the fruit body;the most suitable culture areas for Morchella were poplar forest land and apple orchard;and woodash and poplar-root soil can promote the forming of the fruit body.

结果表明，菌核是羊肚菌子实体产生的重要标志和重要阶段；光照、温度和湿度是子实体形成的关键因子；北芪渣对菌核和子实体的形成有刺激作用；人工栽培适宜在杨树林地和苹果园进行；草木灰和杨树根土可促进羊肚菌子实体的产生。

To broaden desert shrub new utilizing fields, accelerate desert shrub developing to the direction of high added-value and high benefit, the paper studied on the liquefaction of Salix, Caragana and Poplar in the presence of Phenol under sulfuric acid catalysis. The optimum processing parameters for Salix, Caragana and Poplar liquefaction and resinification were investigated. The effect of molar ratio of formaldehyde to liquefied products and NaOH to liquefied products on the character and glue strength of liquefied products resin was studied.

摘 要：为了开辟沙生灌木资源新的应用领域，促使沙生灌木资源的利用向高附加值、高效益的方向发展，本文以苯酚作液化剂，以稀硫酸作催化剂对沙柳、柠条和杨木进行液化实验，分析了反应温度、液比、催化剂用量及液化时间对液化反应的影响；并研究了沙柳、柠条和杨木液化产物树脂化合成工艺和配方，分析了不同的甲醛与液化产物摩尔比以及氢氧化钠与液化产物摩尔比对沙柳、柠条和杨木液化产物树脂的各项性能的影响。

Poplar belongs to Salicaceae, Populus. There are more than one hundard kinds in the world, while more than fivty-seven in China. So, poplar is more important than other trees for not only protecting ecology but also advancing country economy development.

杨树属杨柳科，杨属，全世界杨树有100多种，而我国就有57种之多，因此无论对于生态还是对国民经济的促进作用，杨树都起着其它树种所无法比拟的作用。

Willow has green garb of bright yellow, and poplar leaves still have not won, as early as next door to wait for the ladies, and she was always nagging in the poplar leaf round when his grandson take-home outside, so that this new life Lulu small wind began to enjoy the warm spring outdoor world.

柳树已经遍身披着嫩黄色的绿了，杨树的叶依然还没有圆，隔壁的大婶早在等待了，她总是唠叨要在杨树叶圆的时候，把自己的小孙子抱到户外，让这个新的小生命露露风，开始享受春日的暖洋洋的户外世界。

Results showed that enzyme pretreatments improved the dynamic wettability of a poplar surface with K value increments on the treated poplar surfaces of 11.5% for distilled water, 7.3% for glycerol, and 4.1% for methylene iodide.

在相同条件下，水、甘油和二碘甲烷等3种试剂在酶处理后的杨木表面的K值（与液体湿润速度有关的衰减速率常数）的增幅分别达11.5%，73%和4.1%；随着酶用量的增加，以及酶处理时间的延长，杨木表面的动态润湿性能改善效果更加明显。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。