dbh

There are significant difference among DBH 、 height and volume .

地径、胸径、材积之间存在显著差异。

Trend surface analysis on DBH data of Chinese Fir Provenances

杉木种源胸径生长地理变异的趋势面分析

A study on simulating predictive model of mean DBH for bamboo stands

毛竹林林分平均胸径模拟预测模型的研究

The average DBH of new bamboo increased with the increasing distance from the tree .

随距阔叶树基干距离的增加，新竹平均胸径迅速增加。

Study on DBH Increment Model of Individual Trees Growing for Larix chinensis

太白红杉单木胸径生长模型的研究

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。

There were no significant or significant differences among clones on DBH growth in two tested areas .

胸径生长差异显著或不显著；

The model between aboveground biomass and DBH is fine because of its high significance .

地上生物量与胸径关系模型的相关性都达到极显著。

Study on Variation Patterns and Relationship between Density with the Age and DBH of Fast-growing Poplar

速生杨木木材基本密度变异规律及其与树龄胸径关系的研究

Mean DBH decreased with the increase of stem density in accordance with a power-law function .

平均胸径与立木密度之间呈幂函数关系，后者随前者增加而递减。

The correlation between slope position and slope gradient to DBH or height is marked negative .

坡位和坡度都与水杉树高、胸径呈显著负相关。

Please note that result of the $ dbh - > prepare method is SQL Statement handle .

请注意，$dbh->prepare方法的结果是SQL语句句柄。

Chinese fir : genetic variation and combination selection in DBH growth and wood volume weight for filial generation

杉木杂交后代胸径生长和木材体积质量的遗传变异及联合选择

There exist significant correlations between sapwood area and breast height ( DBH ) .

刺槐边材面积与胸径之间存在着高度相关的关系。

Almost 50 percent of trees were classified as small tree ( DBH < 10 ? cm );

近50%的树木是小树（胸径<10cm）；

Synthetic study of DBH antioxidant

DBH防老剂的合成研究

It showed a lower-higher-lower trend with increase of DBH .

随着年龄的增加，有性生殖力、无性生殖力和生殖值都呈现出低-高-低的变化趋势。

Lower density ( less than 1,500 plants / hm2 ) is conducive to DBH growth . 4 .

较小密度（小于1500株/hm2）有利于胸径生长。

Geographic variability on the DBH growth of Pinus massoniana provenance

马尾松种源胸径生长的空间异质性

The results show that : the damage to standing timber is related to DBH and the selection cutting intensities .

结果表明：保留木的损伤与采伐木的胸径及择伐强度有关。

Plasma dopamine - β - hydroxylase ( dbh ) changes in 100 cases of acute cerebral vascular accidents

100例脑卒中患者血浆多巴胺-β-羟化酶含量变化的观察

These models could be used to generate the standard tables for tree height , dbh , stand density and density control map .

模型可用于编制树高标准表、直径标准表、密度标准表以及密度控制图等。

The genetic gains of DBH and height through selection were 4.75 and 2.38 times of secondary provenance respectively .

原生种源比次生种源具有更高的遗传变异性，通过选择获得的遗传增益分别是次生种源的4.75和2.38倍。

The relative scale parameter p was highly correlated with stand age and quadratic mean diameter at breast height ( DBH );

参数p与林分年龄、平方平均直径呈紧密的正相关性，为分布的相对尺度参数；

( 10 ) Among three kinds of Monte Carlo test methods for spatial pattern , the one based on largest DBH is the best .

本文提出改进校正的方法。（10）空间分布格局的三种MonteCarlo检验方法中，基于最大胸径的MonteCarlo检验法较好。

The DBH , volume , crown breadth and the growth of shoots increase obviously as the density decreases .

胸径、材积、冠幅、新梢生长量随造林密度减小显著增大。

The height and dbh values of 12 year old pure forests have no obvious difference with those of mixed forests ;

12年生的纯林与混交林树高、胸径值差异不显著；

Sapling forest between average DBH and density were positive correlation , negative in the mid-maturation forest .

幼龄林平均胸径与密度的关系表现为正相关，中龄林为负相关。

The result showed : as for pine tree population , most infected pines are less DBH class in the forest .

结果表明：从松树种群角度而言，大部分受害松树是林分中径级较小的林木；

It is also revealed that timber density is in close correlation with mechanical properties , while timber properties are independent of DBH .

木材密度与力学性质显著相关，而木材性质与胸径生长相独立；