黑杨派南方型新无性系纸浆材材性株内变异规律

Variations of paper pulpwood properties within individual of new Aigeiros clones of southern type

系统研究了来自浙江临海黑杨派南方型新无性系试验林 2 0个无性系的纸浆材主要木材性状。结果表明 :黑杨派新无性系树干的纤维长度自上而下逐渐增长 ,树冠上部枝条的纤维较中、下部枝条为短 ;树干木材的基本体积质量则以下部的为高 ,上部稍大于中部 ;树枝条的基本体积质量 ,以树冠下部的为最小 ,自下而上增大。不同树干部位木材纤维的长短频率分布均匀且遵从正态分布。树干纤维长度均值差异主要表现在组中值 0 7mm以下和 1 3mm以上的纤维数量上的差异。 2 0个无性系树干各部位纤维长度为 0 940 0～ 1 0 0 59mm ,均达到国际木材学会规定的中级纤维标准 ,基本体积质量为 0 3333～ 0 3467g·cm- 3;树枝条的纤维长度为 0 6861～ 0 72 52mm ,基本体积质量为 0 3588～ 0 3688g·cm- 3。由此 ,对新无性系作为纸浆纤维材培育与利用提出了建设性意见。表 4参

A systematic study made in a clonal test forest in Linhai on timber properties of paper pulpwood of 20 new aigeiros clones of southern type shows that the fiber length in the trunk of these new clones gradually increases from the top to bottom,the fiber of the branches in the upper part of the canopy being shorter than that of the branches in the middle or lower part of the canopy;the specific gravity in the lower part of the trunk is high as compared with that in the upper part,the latter being slightly higher than that in the middle part;and the specific gravity is the smallest for the branches in the lower part of the crown,which gradually increases upwards.The frequency of the wood fiber length in different parts of the trunk is in evenly normal distribution.The difference in average values of the fiber length of the trunk is mainly reflected by the difference in the quantity of the fiber that is either shorter than 0 7 mm,a mid value of classes,or longer than 1 3 mm.For the trunk of the 20 clones,the fiber length is between 0 940 0 and 1 005 9 mm,which meets the standard laid down by the International Timber Society for the fiber of middle rank and the specific gravity ranges from 0 333 3 to 0 346 7 g·cm -3 in different parts. For branches,the fiber length changes from 0 6861 to 0 725 2 mm and the specific gravity from 0 358 8 to 0 368 8 g·cm -3 .Finally,some constructive suggestions on tending and utilization of these new clones as a kind of paper pulpwood are put forward.