16个粗皮桉种源遗传特征分析及选优

Genetic Characteristics Analysis and Selection of 16 Eucalyptus pellita Provenances

为选择优良种源及家系,对广西东门林场不同种源8 a生粗皮桉(Eucalyptus pellita)生长和与纸浆材相关的材性性状的遗传特征进行研究。结果表明,粗皮桉的木材平均纤维长度为590.9μm,平均纤维宽度为28.9μm,纤维长宽比为20.34,扭结指数为0.29,边材纤维的长宽比、扭结指数比心材的大。胸径与树高,基本密度与纤维长宽比和扭结指数、边材纤维扭结指数与边材纤维长宽比均呈极显著正相关;心材纤维扭结指数与心材纤维长宽比呈极显著负相关。根据主成分分析,种源4、13、10为优良种源;筛选出25个优良家系,其中146、084、53-11排列前三。

In order to select good provenance and family, the genetic characteristics in growth and wood properties associated with pulp wood of eight-year-old Eucalyptus pellita from different provenances in Guangxi Dongmen State Forest Farm were studied. The results showed that the average length and width of wood fiber was 590.9 and 28.9 μm, the fiber aspect ratio was 20.34 with kink index of 0.29, and the aspect ratio and kink index of sapwood fiber were larger than those of heartwood. There were very significant positive correlations between DBH and tree height, density with fiber length-width ratio and kink index, as well as kink index with length-width ratio of sapwood fiber, while kink index was very significant negative correlation with length-width ratio of heartwood fiber. So, according to principal component analysis(PCA), the provenances 4, 13, 10 were excellent,and 25 families were good, in which 146, 084 and 53-11 families were the top three.