杨树

A preliminary application of isozymes in the study of Populus.

Title 同功酶法在杨树研究上的初步应用。

Populus Shenzhou chosen and bred in recent years is chimera poplar superior clone, divided into type A, B and C. Type B served as progenitive material after cutting differentiated into type A similar to Populus tomentosa and type C similar to Populus dakuanensis.

深州杨为近年选育出的嵌合体杨树优良无性系，分为A型、B型和C型。B型作为繁殖材料扦插后可以分化为类似于毛白杨的A型植株和类似于大官杨的C型。

Like Ceres, ArborGen is working on four species: eucalyptus, poplar, and the loblolly and radiata pines.

如同Ceres一样，ArborGen也选择了四种植物：桉树、杨树、火炬松和辐射松。

The spatial patterns of eggs, larvae and adults of Saperda Papulnea L. in three different types of poplar forests in Jinshatan forest centre, Datong Poplars Institute were studied by using geostatistics tools. Geostatistics allows the usage of quantity and location information simultaneously to qualify the spatial pattern of insect population.

根据在大同杨树局所属金沙滩林场3块不同类型样地上收集到的青杨天牛卵、幼虫和成虫的数量和位置资料，应用地统计学方法对其种群的空间格局进行了研究。

In this paper we reviewed the principles of in silico cloning and related bioinformatic resources, and also dicussed the problems and the prospect of in silico cloning.

本文阐述了电子克隆分离杨树功能基因的基本方法、相关的生物信息资源，并讨论了电子克隆技术存在的问题和未来发展。

Tamarix is the most common plant on the plateau, it does not poplars tall, imposing, there is no steadfastness of pine, there indomitable vitality.

红柳是高原上最常见的植物，它没有杨树的高大挺拔，没有松树的坚强不屈，却有顽强的生命力。

Effect of returning hill terraced fields for farming to forestry and grass were surveyed based on fixed point observation for nine years continuously. The results showed that death rate of Popular cathayana, Ulmus pumila and Hippophae rhamnoides was 100%, 92% and 12.7% respectively in terraced fields.

通过对湟源地区阴坡梯田退耕还林还草工程连续9年样区定点观测，结果表明，在梯田栽植的杨树到第9年100%死亡，榆树的成活率只有8%，沙棘的成活率为87.3%，柠条的成活率达100%，但长势不旺。

The result of clusting analysis of 52 counties and cities in northeast Chinawas the division of the risk grade of poplar bacterial canker into 4 districts thatwere seriously occurring district、commonly occurring district、occasionally oc-curring district and unoccurring distric,according to nine weather factors whichwas closely correlated to the bacterial canker.

以与病害密切相关的九项气象因子为指标，对东北地区52个市县进行聚类分析的结果，将东北地区杨树细菌溃疡病的危险等级划分为重发区，常发区，偶发区和不发区四级，这与病害调查的实际情况也是基本一致的。

According to the relationship between the state of the disease of bark necrosis caused Valsa sordida and period of the disease with average temperature,relative humidity,total rainfall,ratio of temperature to humidity,ratio of humidity to rainfall,to computer results,the forecast model of multivariate linear regression is established in the light of multiplicative statistics methed.

根据杨树烂皮病的病情与不同发病时期的平均温度、相对湿度、总降雨量、温湿比、湿雨比的关系，通过电子计算机计算的结果，应用多元统计方法，建立了多元线性回归预报模型。

But after about a month to restore the root system, the leaves of nitrogen, phosphorus and potassium contents in treatment 5, 6, 7, 8, 2 gradually higher than the control. This is because the absorption of fertilizer during this period shown to promote on the elements, and with the passage of time the processing elements continue to be reduced to a leaf until the latter part of the growing season is also higher than the control.3.The pH value in rhizosphere soil of treatments poplar plantation were lower than that in non-rhizosphere soil, but the content of organic,available nitrogen, phosphorus, potassium, utility cuprum and utility zincum were all higher than those in non-rhizosphere soil.

但是经过大约一个月的根系恢复，处理5、处理6、处理7、处理8、处理2叶片中的N、P、K逐渐高于对照，这是因为施肥对元素的吸收在这一期间开始表现出了促进作用，并且随着时间的推移各处理中元素含量持续降低至落叶，直至后期的生长季节也高于对照。3、各处理的杨树林地根际土壤pH值均低于非根际土壤，而有机质、碱解氮、速效磷、速效钾、有效铜和有效锌的含量均高于非根际土壤，与其它处理相比，80cm两侧断根施肥处理的根际土和非根际土壤速效养分含量最高，差异达显著水平。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。