查询词典 Picea

And black spruce Picea mariana (Mill BSP were studied in order to understand the adaptation mechanisms employed by the foliage to deal with fluctuations in boreal climatic conditions.

和黑云杉树枝气体交换日变化的特性进行了试验研究，以便于了解在北部气候条件下叶对环境变化的适应机理。

The spatial regeneration pattern of the Picea wolsonii was studied in the two plots of different disturbance intensity according to the spatial sampling method and design.

依据地统计理论和方法，采取小支撑多样点的空间取样设计，在干扰强度不同的两个华北落叶松林分中设置样地，对云杉更新幼苗的空间格局进行了定量比较研究。

This dissertation focuses on the ecological characteristics, breeding techniques and introduction research on Picea mongolica. The results are as follows:(1) The seedlings and young trees take on a cluster distribution with a high, mortality.

因此，通过对沙地云杉的生态学特性及引种进行研究，找出沙地云杉育苗和引种造林方面的限制因子，为科学育苗和引种推广提供科学的方法和依据，为我国沙化地区的生态恢复起到指导作用。

So, in order to provide scientific afforestation methods and guideline, it is rather necessary to introduce and popularize Picea mongolica in arid and semiarid regions.

但是该树种是云杉属中的特殊种，在半干旱草原中于沙地上能良好生长，有罕见的防风阻沙能力，大有在半干旱区甚至干旱区引种推广的必要。

Picea mongolica, which is a characteristic and one of the first afforestation tree species in Inner Mongolia, plays a great role at the vegetation recovery in the desertfied areas.

沙地云杉是内蒙古赤峰地区与锡林浩特的局部地段所特有乡土树种之一，也是沙地造林的首选树种之一，对于恢复沙化土地植被具有重要的意义。

Picea mongolica is a rare and endangered species in the world, which is conferred to the tide of "biology gene bank" and "living fossil", and mainly distributes in Baiyinaobao sandy land of Chifeng.

沙地云杉是世界上罕见的树种，也是世界珍稀濒危树种之一，有&生物基因库&和&活化石&之称，集中分布在赤峰市白音敖包沙地。

The distribution pattern of Picea schrenkiana poulation was related to its biological characteristics's age structure and regeneration and regeneration mode and the microenvironments.

天山云杉成熟林种群的空间分布格局受天山云杉种群本身的生物学特性、种群的年龄和更新方式等群落内小环境的共同影响。

Picea schrenkiana ; Population structure ; life table ; survival curve

天山云杉；种群结构；静态生命表；存活曲线

Based on different treatments that had been used, this paper studied the breeding techniques and annual growth rhythm of the Picea mongolica seedlings.

采用不同做床方式、不同播种密度，夏季苗床不同遮荫方式等方法研究了沙地云杉育苗技术及其年生长规律。

Picea Dietr.; molecular marker ; genetic diversity

云杉属；分子标记；遗传多样性

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。