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管胞直径、胞壁厚度自髓心向外增加。The tracheid diameter and the thickness of cell wall increase from pith to bark.

纤维长度、宽度和长宽比总体上都依年轮的增加而呈现增大的趋势。Tracheid length, width and ratio of length to width increased with the increase of ages.

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对55个杉木无性系管胞微纤丝角的遗传变异进行了研究。Genetic variations on tracheid microfibril angle of 55 Chinese fir clones were investigated.

管胞长度的种源区和产地效应很小，无一定的地理变异趋势。There were very small effect of seed source and no definite geographic pattern in tracheid length.

元宝山冷杉在管胞直径与射线长度方面与其它冷杉有显著差异。A. yuanbaoshanensis showed great difference with other Abies species in tracheid diameter and rays height.

薄壁细胞向内生长的泡状物通过纹孔伸入相邻的管胞或导管形成的结构。Tylose A bladder like ingrowth from a parenchyma cell into an adjacent tracheid or vessel through a paired pit.

造林密度大，则生长轮变窄，管胞列数减少，晚材率增加。As planting density increased, the growth ring width and tracheid row decreased but proportion of late wood increased.

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研究间歇性淹水对池杉木材管胞形态变异的影响。The effect of intermittent flood upon the radial variation of tracheid features of Taxodium ascendens was investigated.

顺纹抗拉强度主要受管胞长度、管胞强度、纤丝角度、结晶度等因子的控制。Tensile strength is mainly controlled by tracheid length, tracheid strength, microfibril angle and crystalline degree etc.

结果表明，管胞直径和微纤丝角及生长轮宽度等指标表现为差异显著。The results showed that there were distinct differences in micro-fibril angle, width of growth-ring and tracheid diameter.

不同生长速率的样木间该二性状差异很小。No significant difference was also found among tree types with different growth rate for specific gravity and tracheid length.

所以，10龄被确定为基本密度的最佳选择年龄。管胞长度幼——熟龄相关不稳定。The optimum selection age of basic density was determined at 10 years, the juvenile-mature correlation in tracheid length was unstable.

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采集贵州省龙里林场马尾松密度试验林15年生马尾松木材，5种造林密度，研究造林密度对马尾松管胞形态及其径向变异的影响。The tracheid form and radial variance were studied for 15 years Masson pine plantations with five different planting densities in Longli, Guizhou.

研究了人工林红皮云杉木材管胞形态及其径向变异规律，并与天然林进行了比较。Wood tracheid morphological features and their radial variation of Korean spruce plantations are studied and compared with those of natural forest.

轴向管胞之间、轴向管胞与射线薄壁细胞之间、轴向管胞与射线管胞之间，均有不同类型的纹孔对。There are different types of pit-pair between the axial tracheids. the axial tracheid and the ray parenchyma, the axial tracheid and the ray tracheid.

轴向管胞之间、轴向管胞与射线薄壁细胞之间、轴向管胞与射线管胞之间，均有不同类型的纹孔对。There are different types of pit-pair between the axial tracheids. the axial tracheid and the ray parenchyma , the axial tracheid and the ray tracheid.

管胞次生壁S_2层的纤丝角径向变化由髓心向外，开始递减很快，13年后纤丝角度大小相对稳定。Microfibrillar angle within the S_2 layer of the secondary wall in tracheid decreases rapidly from pith outwards, and then levels off after 13 years old.

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吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.

本文综合研究了12年生杉木无性系试验林的生长性状、基本密度和管胞形态的遗传变异规律。In this paper, 12 years old Chinese Fir clones were studied on the genetic variation of growth properties, basic density and tracheid morphological characteristics.

影响管胞形态地理变异的气候因子中，水湿条件是主导因素，其次是温度。Among the climatic factors which affect the geographic variation of tracheid morphological, moisture and rainfall are the principal factors, secondary is temperature.