杨树

Sky is still so blue, leaves of white poplar in the edge of the village had become yellow as autumn is coming.

天依然是那样蓝，村边的杨树叶子在秋天的渲染下已飘黄。

Populus X euramericana cv. 895 is one kind of fast-growing high quality trees which has just been cultivated, bearing barrenly, anti-virus, salt alkaloid, resistance moderate, short cycle to grow up, and its vegetal period is about 240 days. It has the advantages of fast-growing , high material quality , soft textile fiber , high rate of leaving the thick liquid in papermaking, and it has a broad prospect to be embarked.

895杨是刚培育出的一种速生优质杨树，耐瘠薄，抗病性强，耐中度盐碱，抗逆性强，成材周期短，年生长期达240天左右；具有速生、材质好、纤维柔软、造纸出浆率高的特点，开发前景广阔。

Our research work is currently focused on the molecular mechanisms of vascular cambium periodicity regulation and secondary xylem development, including cambial cell differentiation, secondary wall formation and programmed cell death.

本实验室以杨树、杜仲等树木作为实验材料，采用剥皮再生创伤系统和整体系统，研究维管形成层活动周期调控及形成层发生、次生木质部细胞分化、次生壁形成和细胞程序死亡的分子机理，为定向改良木材材质提供理论指导。

Vertical zonation of plants, 700m here are pine, poplar, willow, pulling, etc. 8 kinds and a variety of economic trees. 1700m ~ 1000m between the growth of pine, birch, cypress, Lespedeza, etc., 1000m above with a small amount of Betula, Populus, weed, and six wood, Corylus, moss and so the distribution of irrigated grass, 1500m above the larch.

植物呈垂直分带，700m以下有油松、杨树、柳树、揪等8种及各种经济树种。1700m~1000m之间生长松、桦、柏、胡枝子等，1000m以上有少量桦、山杨、杂木林及六道木、毛榛、苔藓等灌草丛分布，1500m以上为落叶松。

Deltoides, which has triangular leaves and a tuft of cottony hairs on the seeds.

三角叶杨，棉白杨北美洲的一种杨树，尤指普通白杨有三角形叶片、种子上有束棉絮状绒毛

Pollen grains of three species of Cupressaceae and five species of Populus were examined in detail by use of a digital photographic technique and MATLAB software. For each pollen species, 50 measurements were taken of maximum, minimum and mean values of area, eccentricity, pole-length and equator-length.

利用数字照相技术和MATLAB软件测量了5种杨树、3种柏树各50粒花粉的面积、扁圆率、极轴长度、赤道轴长度，计算了面积标准差和极轴长度/赤道轴长度。

In chapter 4, the restoration and rehabilitation technology of multiple functional forest system were studied. Firstly, it was expounded that we should restore and rehabilitate watershed protection forest in source of rivers, in catchment areas of small watersheds and around reservoirs, which includes protecting the present natural forests and planting watershed protection forests in the non-forest land. The main afforestation models comprises "Cupressus funebris + Alnus cremastogyne or Robinia pseudoacacia}","Pinus massoniana + Camellia oleifera (or Robinia pseudoacacia","Populus + Robinia pseudoacacia ", etc.

首先阐述了应在河流源头、小流域集水区和水库周围恢复和重建水源涵养林，这包括保护好现有天然林和在无林地营造水源涵养林，主要林种组合模式有&柏木＋梢木（或刺槐丫'／'马尾松＋油茶&、&杨树＋刺槐&等；其次着重论述了坡地水土保持林体系的重建技术，这包括工业原附、经济林、薪炭林、混农林业和退耕还草还牧等的经营和 A 建设技术；接着简要介绍了林牧业产业化途径。

Through the indoor trial methods, the ability of inhibiting Cytospora chrysosperma by Trichoderma aureoviride was studied.

该文利用室内实验的方法，研究了黄绿木霉菌代谢产物对杨树烂皮病菌的抑菌能力。

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。

Used the dual culture, germination of spores and inoculation experiment , the strains of penicillium sp. had the strongest antifungal effectiveness to cytospora sp .of populus , so the strains of penicillium sp. could continue research .

综合两点对峙培养、孢子萌发和人工接种试验的结果可以看到青霉属菌株对杨树烂皮病菌的拮抗效果最好，因此，可对青霉属进行进一步试验为开发新的生防拮抗制剂打下基础。

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。