杂交鹅掌楸生长表现及其木材胶合板性能

Growth Heterosis and Plywood Characters of Liriodendron chinense×L.tulipifera

调查2～3年生苗期不同交配系统杂交鹅掌楸、10～12年生和22年生杂种林分的生长量,发现杂种具极显著的生长优势.10～12年生杂种林分在湖北、湖南和江苏三地的生长表现说明了杂种具较强的适应性和抗逆境能力;22年生的解析木分析表明鹅掌楸和杂交鹅掌楸主干明显,通直圆满干形好;从材积生长、平均生长量和连年生长量曲线看,杂交鹅掌楸比鹅掌楸更早进入速生期,同时发现22年生时鹅掌楸和杂交鹅掌楸均处于中、壮龄期,未达生长最高峰.经对4种规格的杂交鹅掌楸胶合板胶合性能测定,得知杂交鹅掌楸胶合板符合Ⅰ类胶合板标准的胶合性能要求.

Growth heterosis of two and three years old Liriodendron chinense×L.tulipifera seedlings from different mating systems,three of ten to twelve years old forest stands in Hubei,Hunan and Jiangsu province,and twenty-two years old stands were investigated,respectively.All of the hybrids showed notably growth heterosis and strong adaptive faculty.The stem analysis was studied on L.chinense and hybrid trees,indicating that the forms of these trees were straight and full.The heterosis was further shown from the curves of volume growth,mean annual increment and current annual increment.And hybrids got into a fast growing period earlier than L.chinense.Twenty-two years old L.chinense and hybrids were half-mature stands,they did not get into the fastest growth rate period.The results of physical mechanics of four types of plywood from hybrid trees indicated that this plywood accorded with the standard of grade I mechanical character.