Abstract
Objective With an investigation of differences among wood fiber related traits and their correlation with growth traits among tested poplar (Populus) clones, this paper provides basic information and guidance for the targeted cultivation and selection as well as the utilization of high-quality poplar clones. Method Seven poplar clones, including XL-80, XL-86, XL-83, XL-58, XL-75, ZH-17 and I-69 (ck) with straight trunk and large growth were chosen before the principal component comprehensive score method was employed to evaluate the fiber traits of each clone with indexes including fiber length, fiber width, fiber length-width ratio, cellulose mass fraction and cellulose content per plant. Result The wood fiber length range of the seven poplar clones was 0.95−1.12 mm, all meeting the standard of intermediate fiber length 0.91−1.60 mm stipulated by the International Society of Wood Anatomy. The length to width ratio of fiber varied from 49.09 to 54.62, which is 63.67%−82.00% of the length to width ratio (30) required for paper making. The cellulose mass fraction varied from 53.06% to 59.66%, exceeding the basic requirement (40%) of paper making cellulose content. Fiber width was positively correlated with height, diameter at breast height (DBH) and biomass but not significantly (P＞0.05). Fiber length, fiber length-width ratio and cellulose mass fraction were negatively correlated with DBH, tree height and growth, respectively, but not significantly (P＞0.05). Five clones with good traits were selected by principal component comprehensive score method, namely XL-80, XL-58, XL-86, ZH-17, and XL-83. Conclusion The five selected fiber clones have integrated the excellent characteristics of each character, which could maximize the utilization of poplar clones and provide more abundant genetic resources for poplar multi-objective breeding. [Ch, 6 tab. 24 ref.]
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