| 摘要: |
| 【目的】研究5个杨树无性系幼龄材和成熟材的化学成分，为杨树优良无性系的选择和杨树制浆造纸利用提供依据。【方法】选择欧美杨107杨(Populus×euramericana ‘Neva’)、中汉22杨(P.×deltoides cv.‘Zhonghan 22’)、皖林1号杨(P.×deltoids cv.‘Wanlin 1’)、Z9(P.×deltoids cv.‘Z9’) 和B3(P.×deltoids cv.‘B3’) 5个杨树无性系为研究材料，参照有关国家标准，分别测定其幼龄材和成熟材的化学成分，通过单因素方差分析,比较不同无性系及不同材龄之间的差异性。【结果】综纤维素、纤维素、木质素、苯醇抽提物、10 g/L NaOH抽提物的含量,在所测的5个杨树无性系试样中分别为749.7～830.7，398.1～434.1，177.1～198.0，8.8～14.8和190.2～237.2 g/kg。5个杨树无性系成熟材中的综纤维素和纤维素含量均高于幼龄材，木质素含量均低于幼龄材；苯醇抽提物含量除皖林1号杨外，其余无性系均表现为成熟材大于幼龄材；10 g/L NaOH抽提物含量在不同无性系之间差异较大。幼龄材与成熟材之间，综纤维素含量差异极显著（P<0.01），苯醇抽提物含量差异显著（P<0.05），其余化学成分差异均不显著；不同无性系之间，综纤维素含量和10 g/L NaOH抽提物含量在P=0.001水平上差异显著，木质素含量在P=0.01水平上差异显著，其余化学成分差异均不显著。【结论】从化学成分来看，5个杨树无性系均是制浆造纸的优良原料。由于无性系之间化学成分差异显著，幼龄材与成熟材之间化学成分也存在差异，因此建议在选择制浆造纸原料时,应优先考虑无性系的影响。 |
| 关键词: 杨树无性系 幼龄材 成熟材 化学成分 |
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| 基金项目:国家自然科学基金青年基金项目（30901132）；安徽省自然科学基金项目（11040606M60） |
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| Comparative study on the chemical composition between juvenile and mature wood of different poplar clones |
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| Abstract: |
| 【Objective】This paper is aimed at analyzing the chemical composition of juvenile and mature wood of five different poplar clones so as to work out some helpful and necessary data to select quality poplar clones and to lay basis for the technology of employing poplar pulp as raw materials in paper industry.【Method】With poplar clone 107 (Populus×euramericana‘Neva’),poplar clone Zhonghan 22(P.×deltoides cv.‘Zhonghan 22’),poplar clone Wanlin-1 (P.×deltoids cv.‘Wanlin 1’),poplar clone Z9(P.×deltoidscv.‘Z9’) and poplar clone B3(P.×deltoids cv.‘B3’) as samples and national standards as reference,the research determines the chemical composition of the five sample poplars and,with one way ANOVA,analyzes the differences among the selected poplar clones and among poplar ages.【Result】The research concludes that,in all tested samples,the content of holo-cellulose,cellulose content,lignin content,benzene-ethanol extracts and 10 g/L NaOH extracts vary respectively from 749.7-830.7,398.1-434.1,177.1-198.0,8.8-14.8 and 190.2-237.2 g/kg.The contents of holo-cellulose and cellulose in mature wood of all five poplar clones are higher than those in juvenile wood,and as for lignin,the result is just the opposite.The content of benzene-ethanol extracts in the selected poplar clones excluding Wanlin-1 is higher in mature wood than that in juvenile wood.There is inconsistent result for comparison of 10 g/L NaOH extractive content between juvenile and mature wood among five poplar clones.Comparison of the content of holo-cellulose between juvenile and mature wood reveals some significant differences at the level of 0.01,and benzene-ethanol extracts at 0.05.No significant difference is found for other chemical composition.The contents of holo-cellulose and 10 g/L NaOH extract vary among all poplar clones selected at the level of P=0.001,and lignin at P=0.01.No difference is found in other chemical composition among poplar clones.【Conclusion】In the light of chemical composition,all five poplar clones selected are excellent raw materials for pulping and paper-making.But for the remarkable differences in chemical composition between juvenile and mature wood,and among different clones,it is highly suggested that clone factors in particular should be considered in the selection of raw materials for pulping and paper-making. |
| Key words: poplar clone juvenile wood mature wood chemical composition |
