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随距阔叶树基干距离的增加，新竹平均胸径迅速增加。The average DBH of new bamboo increased with the increasing distance from the tree.

反之，胸径分化严重，且劣势木所占比重大，此时感病指数大。On the other hand, infectious index was larger in stands with big DBH differentiation.

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地上生物量与胸径关系模型的相关性都达到极显著。The model between aboveground biomass and DBH is fine because of its high significance.

若将主干分叉林木生长发育情形与主干单一者相比较，后者胸径较大且树高较高。As compared to the forked-stem trees, the straight-stem trees were wider in DBH and taller in height.

多重比较结果表明各代之间的树高、胸径、材积差异均达到了极显著的水平。Result showed that, with the planting generation increased, tree height, DBH and log volume decreased.

此外，还研究了冠幅和胸径、冠长和胸径及树冠比和冠长的关系模型。The relations between crown width and DBH, crown length and DBH and crown ratio and crown length were also studied.

竹笋产量主要影响因子是丛立竹数和立竹胸径，决定出笋数量和笋个体质量。The key factors affecting the yield of shoot were the quantity and DBH of living culm, which determined the quantity and quality of shoot.

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运用所拟合的数量化回归模型预测马尾松幼林的树高和胸径可达到较高的精度。The fitted quantitative regression models could be used to forecast height and DBH of the young stands, and the forecast precision was high.

杉木在树高、胸径和材积等生长性状间有较高的表型和遗传相关性。The relatively high phenotype and genetic correlation of Cunninghamia lanceolata exist between growth characters of height, dbh and volume, etc.

莽山乔木的最大胸径、胸高断面积之和与海拔呈明显的负相关性，而立木密度的变化规律不明显。Mang, maximum DBH and basal area showed significantly negative correlations with altitude while stem density did not change significantly with altitude.

在培育思茅松人工幼林时，采用氮、磷配比施肥对其树高和胸径生长具有促进作用。For the cultivation of Simao pine sapling, the formula fertilization of nitrogen, phosphorus fertilization can promote the growth of tree height and DBH.

用五种遗传稳定型分析方法对四个区域化试验点的5个美洲黑杨无性系生长量的基因型与环境交互作用进行了分析。The genotype-environment interaction of 4-year DBH growth was analyzed in 4 locations for 5 cottonwood clones by using 5 genetic stability analysis methods.

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通过胸径和树高与生物量建立的回归方程，可预测尾叶桉MLA无性系单株或林分生物量。The single biomass and stand biomass of E. urophylla cl. MLA plantation might be forecasted by the regression equation established through height, DBH and biomass.

其中，胸径大小比数与角尺度这两个是空间结构参数，其成功的引入到模型中说明风景林的空间结构与景观有一定的关系。And, the Neighborhood Comparison of DBH and Neighborhood Pattern are introduced into the model successfully shows that the forest structure is related with the landscape.

基于种群径级结构分析，木荷种群密度随个体胸径的变化趋势类似于偏正态分布形曲线。Based on analysis of population size class structure, the trend of population density of Schima superba changing with individual DBH was similar to skew normal distribution.

生物复合肥料、菌剂和保水剂均显著提高白榆、小叶杨、刺槐、栾树树高和胸径的年净生长量，但保水剂的提高程度最高。Biological compound fertilizers, biopreparate, absorbent polymer can increase the DBH and height net growth of per year, but effect degree of absorbent polymer is the highest.

仅采用氮、钾配比施肥或磷、钾配比施肥，树高和胸径提高较小。Only applied the formula fertilization of nitrogen and potassium fertilizer or potassium and phosphorus fertilizer, the tree height and DBH of Simao Pine was increased smaller.

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试验还表明，采用木麻黄无性系造林，其树高、胸径、材积的生长明显优于木麻黄实生苗的生长速度。The difference was not significant. The experiments indicated that tree height, DBH and volume of superior Casuarina equisetifolia clones was faster than that of seedling plant.

根据树干解析资料，建立了70年人工云杉林的单株材积与胸径和树高的数学模型。Based on the data from stem analysis and growth ring measurement, regression models of stem volume with DBH and tree height of 70 years Picea asperata plantation were established.

对等密度107杨幼龄林进行一次性施肥灌溉措施对比试验，结果表明，一次性水肥措施对其幼林未郁闭前各龄期胸径生长量和郁闭度均有促进作用。Comparative experiments was conducted on the effect of one-time irrigation and fertilization on the DBH and crown density of young 107 poplar plantations of even planting density.