针叶树

A unisexual reproductive structure of gymnospermous plants such as conifers and cycads, typically consisting of a central axis around which there are scaly, overlapping, spirally arranged sporophylls that develop pollen-bearing sacs or naked ''.

球果单性裸子植物的生殖器，例如针叶树和铁树目植物，一般由覆满鳞片和褶皱的中心轴构成，长螺旋状排列的孢子叶，孢子叶最终成为花粉囊或裸露的孢子或种子

Based on the structural model for tracheid, the expressions of flow-resistors of tracheid in three directions of grain are reduced with the theories of fluid mechanics. The gas permeability of tracheids also...

计算结果表明，管胞流阻可以描述气体渗透阻力的分布情况，反映气体渗透性在 3个纹理方向的差异，在木材细胞层次揭示针叶树材气体渗透性的机制。

When the temperature of wood is 80℃, the absolute pressure of ambient is 0.02Mpa, the equilibrium radius of bubble calculated theoretically is 4.68μm, however, the tracheid of softwood internal diameter is 20~30μm,obviously there is sufficient space to form bubble in liquid.

在木材为温度为80℃，环境绝对压力为0.02MPa的条件下，理论计算表明此时的汽泡平衡态半径为4.68μm，而针叶树材管胞的内径为20～30μm。

The results showed that small-scale gaps were the predominant types of disturbance. The average gap density was 12.5 km^(-1). The distribution pattern of gaps was aggregated on south facing slopes and was approximately homogeneous on north facing slopes. Conifer trees were the primary gap-makers in this forest that was dominated by Abies faxoniana, Tsuga chinensis, Betida utilis, both in abundance and diameter rank. The decay class distribution of gap-makers indicated that the mode of gap formation and gap-maker species changed with age of the forest; the contribution of conifer species to gap formation decreased with time and broadleaf species increased.

结果表明：l本区以小型林隙干扰为主，林隙平均密度为12.5个km^(-1)，林隙的分布格局在阳坡和山脊为集聚分布，阴坡近均匀分布；林隙形成木以针叶树为主，岷江冷杉、铁杉和糙皮桦在形成木的数量和径级组成上均居前列。2林隙形成木的腐烂等级分布揭示出林隙形成木的形成方式和种类组成均随时间变化。

Using it, he has built up a series of tree-ring chronologies from Thailand and Vietnam that indicate a period of severe drought across mainland South-East Asia in the early 1400s.

除此以外，Brendan Buckley，天文台其中一位研究人员，发现一种称为福建柏的可活千年以上的针叶树，给了他所需要的标记。

The air freshened and shared the flavor of conifers as we came into the mountains.

进入大山后，清新的空气中洋溢着针叶树的芳香。

The objective of this paper was to investigate the possibility of a transverse vibration technique for assessing static bending, tensile and compressive strength of structural lumbers.

共选择了186根尺寸为38 mm 89 mm 3 658 mm的加拿大针叶树商品材云杉-松-冷杉的建筑结构材作为试验材料，探讨采用一种横向振动技术来评估这些规格材的静态抗弯、抗拉和抗压强度的可行性。

Extent to which ornamentals, hardwoods, conifers and other flora enhance the design and playability of a course without overburdening it or threatening strategy and agronomy.

观赏植物，阔叶树，针叶树和其他植物是否提高球场的设计和可打球性，其负担并不过重，不威胁战略性和农艺性。

The amber was formed when the forest, in what is now Ethiopia, was still mostly made up of conifers.

这些琥珀形成于埃塞俄比亚森林依旧主要由针叶树构成的时期。

Several other conifers produce small male catkins.

其它几种针叶树产生小雄花序。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。