Ⅰ-214杨木材抗劈力株内变异研究

对人工林Ⅰ-214杨木不同高度、不同方向心边材的径、弦面抗劈力进行了研究。结果表明:Ⅰ-214杨径面抗劈力和弦面抗劈力平均值分别为9.2N/mm和11.9N/mm,且Ⅰ-214杨抗劈力南向略大于北向,边材大于心材,弦面大于径面。Ⅰ-214杨径面和弦面抗劈力随高度增加而逐渐降低,最后趋于稳定,且方差分析表明,不同高度径、弦面抗劈力在0.05水平差异呈显著性。

Intratree Variability of Tensile Strength Parallel to Grain in Chinese Fir and I-214 Poplar from Plantation

The variation of tensile strength parallel to grain in Chinese fir and 1-214 poplar wood from plantations was studied in this paper. Aaccording to the national standards The Testing Methods for Physical and Mechanical Properties of Wood （GB 1927 to 1943 -- 1991）, the small clear wood samples were cut and tested, which represent the south and north of trees with heights of 1.3, 3.3, 5.3 and 7.3 m. The results showed： the tensile strength parallel to grain of the north wood was higher than that of south wood. ANOVA shows that the tensile strength parallel to the grain with height is of significant difference （at 0.05 level）.

杨木单板染色工艺与表面材色的关系

试材为I-214杨木单板,以染料酸性大红GR和活性艳蓝KN-R为染化试剂,选取染液质量分数、染色温度、浸染时间为考察工艺因子,进行单板染色试验。通过多光源分光测色计测定染色单板的表面材色,用CIE(1976)L*a*b*Diagram对其进行颜色表征。结果表明:染色单板表面材色与着色度的变化与染液质量分数、染色温度、浸染时间的关系不同,高温下染色时染液质量分数增大,着色度(ΔE*ab)提高;染色时间延长,着色度有所增加或无明显变化;染色温度对表面染色影响较小。酸性染料和活性染料染色的单板材色变化幅度接近。

农田林网中不同杨树品种生长差异性研究

在农田林网中进行Ｉ－２１４杨、加杨、小美旱杨、北京杨４个杨树品种的造林对比试验，２０ａ生Ｉ－２１４杨的平均胸径为４２．１ｃｍ；平均树高为２７ｍ，平均单株材积为１．３６９６ｍ３，约是加杨、小美旱杨、北京杨的４～８倍。