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胸径     
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  dbh
    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
短句来源
    The preserving rate,tree height,crown growth of the stands which have been block transformed by adopting measures(e.g.,using superior clones of Casuarina equisetifolia) on the behind greenbelts are 51.17%,2.3%,and 25.71% higher than CK(except 1.2cm lower than mean DBH) compared with remain-aged-belts.
    在后沿片林内通过采用木麻黄优良无性系等综合措施块状改造后的林分与保留老林带相比,除了平均胸径生长略低1.2 cm外,其保存率、树高和冠幅生长量显著高于保留低效林的51.17%、2.3%和25.71%。
短句来源
    The mean relative precision of DBH,tree height,volume comes to 99.22%,99.73%,98.33% by predicting 32,34 aged forest stand,the results showed that Grey-Markov could be used to predict the growth of L.kaempferi plantation with high precision.
    从对32、34龄阶的预测结果看,灰色—马尔柯夫模型预测的平均相对精度分别为胸径99.22%、树高99.73%、材积98.33%,能进行高精度的预测工作。
短句来源
    Eucalyptus cloeziana is a potential saw timber species,the study on provenances and families shows that mean HT and mean DBH arrives to 7.45 m and 7.10 cm at 2.5 years old,and there are significant differences between provenances and families for all growth traits.
    大花序桉(Eucalyptus cloeziana)是生产锯材的潜力树种之一,对其进行了种源/家系早期选择研究,结果表明:2.5年生试验林的平均树高和胸径分别为7.45 m和7.10 cm,且各指标在种源和家系水平上都存在极显著差异;
短句来源
    The heritability of HT,DBH and Volume of family are 71.1 %,75.1 % and 68.5%,and also the heritability of HT、DBH and Volume appearing to be the older the bigger.
    树高、胸径及材积的遗传力随树龄的增加而增大,2.5年生时树高、胸径及材积的遗传力分别为71.1%、75.1%和68.5%;
短句来源
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  diameter
    Study on Relations between Diameter at Breast Height and Diameter inside Bark at Ground for Main Timber Species in Northern Fujian
    闽北主要用材树种胸径与去皮地径关系的研究
短句来源
    Application of BP Neural Network Model to the Simulation of Breast-height Diameter and Tree-height Growth
    BP模型在单木树高与胸径生长模拟中的应用
短句来源
    It concluded that Lushuihe provenance are the best compared with other sites from height and diameter heritability no matter individual and family,which has made an increases of 20% and 20.6% to plus individual and 10.64% and 10.63% to family.
    露水河种源树高、胸径单株和家系遗传力均高于三地种源,树高、胸径单株遗传力分别高出20.0%和20.6%,树高、胸径家系遗传力分别高出10.64%和11.63%。
短句来源
    The average tree volume,height and diameter of 6 superior families were above 0.033 339 m3,11.31 cm,6.62 m respectively which had average genetic gains above 30%,9%,11%. These superior families could be used for seed orchard and vegetative propagation.
    调查数据经过统计分析,从参试的家系中选出6个优良家系,其材积、胸径、树高平均值分别达到0.033 339m3、11.31 cm、6.62m,平均遗传增益分别超过30%、9%、11%,这些优良家系可以作为福建柏种子园建园材料和无性繁殖材料。
短句来源
    breast diameter gain of 7.60%, 9.68%, 12.08%, 15.05% and 19.70%, representing genetic gain of 7.07%, 9.00%, 11.23%, 14.00% and 18.32%, respectively;
    胸径现实增益为7.60%、9.68%、12.08%、15.05%和19.70%,遗传增益为7.07%、9.00%、11.23%、14.00%和18.32%;
短句来源
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  diameter at breast height
    Study on Relations between Diameter at Breast Height and Diameter inside Bark at Ground for Main Timber Species in Northern Fujian
    闽北主要用材树种胸径与去皮地径关系的研究
短句来源
    After cultivation for 4 years, the mean diameter at breast height of triennial seedling bamboo forest can reach 2. 7 cm, and that of mother bamboo cultivated in the same period is 5. 1 cm.
    经过4 a培育,3年生实生苗竹林新竹平均胸径达2.7 cm,而同期栽培母竹新竹的平均胸径为5.1 cm.
短句来源
    In the seventh year after infestation by the lobbolly mealybug, diameter at breast height, height and annual volume of the nine -year- old slash pine declined by 10.31% , 20.00% and 13.41% respectively . The volume loss amounted to 1.701 m3 per hectare.
    粉蚧入侵后的第7年,9年生湿地松的胸径、树高和材积的年生长量分别损失10.31%、20.00%和13.41%,每公顷损失材积1.701m3。
    Quadratic regressive orthogonal design for density of bamboo and age structure showed that the regression equation of yield and quantity of shoot, the number from individual bamboo, individual weight, average diameter at breast height of one-year-old bamboo and economic profit fitted very well at different level, and the regressive result was significant(F0.1≥5.54) and terrible significant(F0.05≥10.1).
    绿竹笋用林经营密度和年龄结构通过二次回归正交试验,结果表明:鲜笋产量、挖笋个数、单株发笋个数、个体重、新竹平均胸径及经济收益回归方程在不同水平回归显著(F0.1≥5.54)或极显著(F0.05≥10.1),回归方程拟合良好。
    Relationship between Diameter at Breast Height and Volume of Forest-tree: Logistic Derivation Model
    林木胸径与材积的关系──Logistic衍生模型
短句来源
更多       
  breast diameter
    breast diameter gain of 7.60%, 9.68%, 12.08%, 15.05% and 19.70%, representing genetic gain of 7.07%, 9.00%, 11.23%, 14.00% and 18.32%, respectively;
    胸径现实增益为7.60%、9.68%、12.08%、15.05%和19.70%,遗传增益为7.07%、9.00%、11.23%、14.00%和18.32%;
短句来源
    When the breast diameter ranges from 4 to 11 cm, internodal length can reach the maximum of 50-65cm as the node is 10-15. The conclusion of this study may provide basic data for exploitation and utilization of B. wenchouensis
    大木竹的节间长度随高度的变化趋势呈二次曲线,在胸径为4~11cm的范围内,节位数10~15处的节间长度最大,可达50~65cm。
    Preliminary Theoretic Study on Basal Area at Breast Height per Hectare Determined by the Method of 100 Times of Circles of Forest Stand Average Breast Diameter(三)——Method and characteristics
    林分平均胸径100倍圆法测定每公顷胸高断面积的理论初探(之三)——方法与特点
短句来源
    Preliminary Theoretic Study on Section Area per Hectare Determined by the Method of 100 Times of Circles of Forest Stand Average Breast Diameter II——Error Analysis and Correction Coefficient
    林分平均胸径100倍圆法测定每公顷断面积的理论初探(之二)——误差分析与修正系数
短句来源
    It's seedling height and breast diameter exceeded P.tomentosa 34.02%and 19.94% respectively under the same condition, and it was not obvious difference with triploid P. tomentosa.
    年生长量苗高、胸径分别超过同类条件下毛白杨的34.02%和19.94%,和三倍体毛白杨生长量相当。
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  dbh
Results showed that the tree's sapwood area was closely related to diameter at breast height (DBH).
      
Single tree's daily water consumption ascended as DBH and sapwood area increased.
      
The average height and DBH growth of three-year-old clones were 28.6% and 16.7%, respectively, higher than those from seedlings, and average gain of wood density reached 8.7%.
      
Diameter at breast height (DBH) was positively related to the contents of organic matter in the soil, and the contents of N, P and K in the tree leaves had correlation coefficients of 0.967, 0.955, 0.988 and 0.972, respectively.
      
Diameter at breast height (DBH) and tree height in the intercropped plantation were 50.5%-136.7% and 27%-59.5% higher than those of the CK, respectively.
      
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  diameter
The problem of reconstruction of the function from the data of its integrals over half circles A ? H with centers at the diameter of H is studied.
      
Furthermore, its connectivity, diameter and transitivity (vertex-, edge-) are also determined.
      
The k-diameter, combining connectivity with diameter, of G is the minimum integer dk(G) for which between any two vertices in G there are at least k internally vertex-disjoint paths of length at most dk(G).
      
Furthermore, these conditions are sharp and the upper bound d of k-diameter is best possible.
      
This paper presents an exact formula for the cutwidth of trees with diameter at most 4.
      
更多          
  diameter at breast height
The growth processes of height and diameter at breast height were divided into three stages: a fast growing period, a stable growing period and a slow growing period.
      
Results showed that the tree's sapwood area was closely related to diameter at breast height (DBH).
      
Diameter at breast height (DBH) was positively related to the contents of organic matter in the soil, and the contents of N, P and K in the tree leaves had correlation coefficients of 0.967, 0.955, 0.988 and 0.972, respectively.
      
Diameter at breast height (DBH) and tree height in the intercropped plantation were 50.5%-136.7% and 27%-59.5% higher than those of the CK, respectively.
      
The results revealed that direction and degree of slope, average diameter at breast height in populations, and population density were the main influencing factors.
      
更多          
  breast diameter
Contrast resolution was found to be dependent upon breast diameter in the size of the test object in question.
      
Scattered radiation levels were measured as a function of breast diameter, beam energy, and breast composition.
      
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