查询词典 spruce

The stem flow of spruce and larch had acidulation on the soil, but the soil around the bole of spruce didn't present intensive acidity (the lowest pH of water and KCl immersion were 5.13 and 4.79, respectively), so the acidulation of stem flow is not the direct reason of spruce death.

虽然两树种树干径流对土壤均产生了酸化作用，但由于云杉树干周围土壤PH并没有出现较强的酸性（水浸pH下降到5.13，盐浸pH下降到4.79），因此，还不能认为云杉的衰退死亡与树干径流的酸化作用有直接关系。

Breeding technology is the base of seedling cultivating, seedling of Korean Spruce in certain shade could grow better than seedling of Korean Spruce in sunlight, seedling of Korean Spruce could grow bester in 25% soil containing water. Forest management was formed by standardized site selection, site preparation, planting, cultural work on young trees of seedlings cultivating technology.

育苗技术是苗木培育的基础，红皮云杉育苗在一定的遮光条件下生长好于全光条件下的生长土壤含水率25％最适苗木生长；营造技术将整套苗木培育技术从立地选择、整地栽植、幼林抚育系统规范化后面形成的；密度定量管理以密度效应为理论基础。

According to the change of the enemy\'s quantity and the qualitative theory of the differential equation, we research the spruce aphides and its predator system. At the same time, we discussion the spruce aphid multiplication model when the natural enemy quantity is a certain value and the periodic oscillating model whose the quantity of the natural enemy changes along with the time. Obtains the stability condition of the balance point and the limit-cycle existing condition, the system presents the dissipative structure\'s character. Finally it explains that this theoretical analysis has certain practical significance regarding the preventing and controlling harmful insect.

第五章，松毛虫与其天敌的关系是食饵和捕食者的关系，根据天敌数量的变化，利用微分方程定性理论，研究松毛虫与天敌系统，讨论天敌数量为一定时的松毛虫增殖模型和天敌数量随时间变化的周期振荡模型，得到正平衡点全局稳定性和极限环的存在条件，通过计算机模拟，说明周期振荡的捕食模型能够呈现典型的时间耗散结构特征，对于防治害虫有一定的实际意义。

Since the mid-1970s, about 50 percent, or 1 million acres (400,000 hectares), of the Kenai Peninsula's adult spruce trees have succumbed to the spruce bark beetle.

自从20世纪70年代中期，大约50％，或100万英亩（400，000公顷），奇奈半岛的成年云杉树已经屈服于云杉树皮甲虫。

Forest Service has enlisted spiders in the war against the spruce budworm, the Northeast's most devastating enemy of spruce and fir forests.

在缅因州，美国林业局的丹尼尔-詹宁斯征募蜘蛛来与云杉芽卷蛾——东北部云杉和冷杉林最凶恶的敌人——作战。

In this study, the northern catchment of the research site was selected. The main vegetation types included pine woodland, meadow, ecotone between hemlock forest and meadow, hemlock forest, ecotone between hemlock and spruce forest, and spruce forest.

本研究样区为塔塔加鞍部北面集水区，包括各植群与其相邻的推移带：二叶松疏林区、草原区、草原与铁杉森林推移带、铁杉森区、铁杉与云杉林推移带及云杉森林区，并於所规划集水区外选取两参考样点：二叶松森林与麟趾山草原区。

The company deals with the business of indoor and outdoor landscaping timbers (e.g. red cedar, yellow cedar), wood-house building materials (e.g. SPF,OSB,engineered wooden products, hardware connections), carving materials (e.g. yellow cedar, spruce) and furniture materials e.g. hemlock, Douglas fir, spruce etc.

主要经营室内和室外景观材，木结构房屋建材（SPF，OSB，工程木制品和五金链接件），雕刻材，家具材。

Tianchi around the mountainside, there are a number of spruce forest, spruce-shaped pagoda is a famous scenic tree.

天池四周的山腰上、有许多云杉林、云杉形如宝塔是著名的风景树。

Spruce Knob lies within the Monongahela National Forest and is a part of the Spruce Knob-Seneca Rocks National Recreation Area.

云杉旋钮在于莫农加希拉国家森林和是部分云杉旋钮，塞涅卡岩国家休闲区。

On the northern slope of Changbai Mountain subalpine spruce-fir forest plant species composition our country are boreal spruce, and alpine boreal forest tree species in the main update.

浅析长白山北坡亚高山云冷杉林的植物种类组成云杉是我国寒带、寒温带及高山林区主要更新造林树种。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。