三倍体毛白杨化学成分径向变异的研究

Studies on Variation of Chemical Components of Populus Tomentosa Carr.Triploid Clones

为了择优选用最佳品系和确定最佳工艺成熟期 ,为浆纸性能评价作初步的探索 ,本文对 9个三倍体无性系和 1个二倍体无性系胸高处的化学成分按年轮进行了测定和研究。结果显示了毛白杨各化学成分在径向的变异规律为 :苯醇抽出物含量在径向从髓心向外是逐渐降低的 ,个别无性系在最外层有反常的升高 ;木素含量在径向从髓心向外是成直线下降的 ;α-纤维素含量在约第 7年达到最大值 ,之后有的无性系保持恒定 ,有的略有下降 ;综纤维素含量在径向随年轮的变化不大 ,基本上保持一条直线。与普通的二倍体毛白杨相比 ,三倍体毛白杨无性系的木素含量低、α

In order to choose the best Populus Tomentosa carr . Triploid clone and ascertain their maturity period,9 triploid clones and 1 normal clone of Populus Tomentosa are studied in this paper.The chemical components according to growth rings at chest height are measured and investigated.The chemical components measured include:benzene_alcohol extractives content,lignin content,α-cellulose content and comprehensive cellulose content.And the regulations in radial direction are got and reported in this paper:benzene_alcohol extractives content decreases with ages of growth rings,but at the last ring,some clones increase abnormally;lignin content decreases in a liner with the age of growth rings;α-cellulose content increases rapidly and reaches the maximum at about the 7th rings,and then some clones keep stability and some decrease;comprehensive cellulose content changes little with the age of growth rings,it always keeps constant.Contrast to the normal clone,the triploid clones' content of lignin is lower,α-cellulose and comprehensive cellulose are higher.So populus tomentosa carr .triploid clones are excellent sources for pulping and papermaking.