stem form的例句大全

In, order to tap adequately the potential of stem form improvement and to provide theoretical foundation for mult-generation breeding, the possibility of selecting indirectly for stem form from the tree crown structure was studied.

为了充分挖掘干形改良的遗传潜力和为多世代育种提供理论依据，探讨了从树冠结构方面对干形实行间接选择的可能性。

A formula of stem form curve for Pinus tabulaeformis

油松干曲线式

Approach to drawing up tree-length volume table and commercial volume table by stem form exponent method

用干形指数法编制原条材积表及商品材积表的探讨

Preliminary study of the principal component of stem form for hardwoods

阔叶树干形主要成分的初步研究

Through the integrated analysis of the survival rate, growth, resistance and stem form of the woods cultivated both in traditional afforestation method and in peg planting method of 21 poplar clones, 5 superior poplar clones suitable for this area were selected.

对21个杨树无性系用钻孔和传统方法造林的成活率、生长量、抗性、干形进行综合分析，筛选出适合本地区生长的5个优良杨树无性系。

Study on Effect of Stand Density on Tree Stem Form of Slash Pine

林分密度对湿地松林木干形影响的研究

Study on the stem form of Pinus massoniana and estimation of Standing Volume

马尾松树干干形及材积估测的研究

Surface Area Models of Standing Tree Stems by Relative Stem Form Method

用相对干形法建立立木树干表面积模型的研究

Study on the Stem form Variation and Selection of Paulownia

泡桐干形变异与选择

A Generalized Stem Form Model for Chinese Fir Plantation

杉木人工林广义干形模型的研究

Application of the Generalized Stem Form Model to the Determination of Chinese Fir Plantation Volume

广义干曲线模型在杉木人工林蓄积量测定中的应用论回溯推理的模态形式

The advances of Paulownia stem form Cultivation Research

泡桐干形培育研究进展

Seven elite trees are selected based on the DBH growth and the stem form.

以胸径生长量和干形作为选择指标，从东部黑核桃优良家系中选出速生、干型好的优树7株。

Research on the Genetic Variation of New Clonal Stem Form Traits in Populus Deltoides

美洲黑杨新无性系干形性状遗传变异初步研究

Studies on the stem form and taper of black locust clonal plantations

刺槐无性系人工林干形与削度研究

And the order of quality index was health condition, stem form, growing power, tree face quality and fruiting yield.

形质指标的大小顺序是健康状况，干型、生长势、树皮性质和结实等级；

Genetic Analysis on Combining Ability of Growth, Stem Form and Wood Basic Density of Pinus massoniana by testcross mating design

基于马尾松测交系子代的生长、干形和木材密度GAC/SCA分析

The phenotypic of leaf, growth traits and stem form traits are all normal distribution, which indicate that they are controlled by polygons.

叶片形态、生长性状、干形性状表现型分离均呈正态分布，表明他们均由微效多基因控制。

A general review of the theory of relative stem form and its application is given based on the variation law of relative stem and normal form factor, calculation of standing volume and standing stock, etc.

本文从相对干形和正形数的变化规律、立木求积、林分蓄积计算等方面，综述了相对干形理论及其应用的研究成果。

Green-pruning could also effectively control the length of knots on wood, reduce tree taper, improve the proportion of clear wood and the under branch height, so that to improve the stem form and quality.

人工修枝还能有效地控制木材中节子的长度，提高杉木无节材比例，同时减小尖削度，提高枝下高，使杉木干形更趋近于通直圆满。