美洲黑杨不同径级木材纤维、导管形态及其基本密度的差异

通过对美洲黑杨林分内不同径阶木材解剖特性和基本密度的差异分析,结果表明:(1)株内径向年轮宽度先增加,第3轮达最大宽度,之后逐渐减小,10轮后年轮宽度仅2.3mm。纤维、导管形态中的长度、宽度及长宽比径向表现为递增模式,前5轮迅速增加,5轮之后缓慢增加,8轮之后趋于稳定;壁厚径向上总的趋势稍微增加,壁腔比因宽度增大而表现出稍微降低,呈起伏状。树木基本密度径向趋势是随着树龄增加而增大,浸提物含量径向为递减模式;(2)林分内不同径阶个体间同一年轮宽度和木材基本密度随着径阶增加而增大,两者径阶间的差异达到显著性水平。不同径级同一轮纤维形态、导管形态特征株间差异均不显著。这反映了杨树林分内生长量与木材基本密度间为正相关,与纤维形态、导管形态特征值之间没有相关性。基本密度随着径阶增加而增大,可能与木材组织比量中的纤维比例增加有关。

Difference in Timber Fiber Vessel and Basic Density of Populus deltoides with Different Diameter Classes

Through the analysis of the difference in the wood anatomical properties and basic density,the results showed:(1)The width of annual ring first increased from pith to the 3rd ring,then gradually decreased.The width of 10th annual ring was 2.3 mm.Among wood anatomical properties,length,width,length-width ratio of fiber and vessel increased from pith to the 5th ring,then increased slowly and levelled off after the 8th ring.The general tendency of wall thickness in the radial direction somewhat increased,the r...