浙北低丘用材树种试验与选择

临安横畈林场进行41个树种造林对比试验,17年生试验林调查表明:造林保存率极低,生长很差,已被淘汰16种;保存率低,生长不良,呈灌木状5种;保存率60％以上,生长一般4种;保存率80％以上,生长良好16种。在针叶树种中火炬松、湿地松、晚松生长良好,单位面积蓄积量超过马尾松1.0～1.7倍。杉木的3个类型以灰枝杉生长最好。在阔叶树种中四川大叶樟、木荷、南酸枣、蓝果树、檫树生长良好。它们的树高、胸径和材积生长量均超过马尾松;单位面积年均材积生长量超过马尾松24.46％～65.96％。试验说明在浙西北低丘山地,上述针阔叶树种有发展推广前途。

Experiments and Selection of Commercial Tree Species in Northern Zhejiang

A forestation contrast of 41 tree species had been conducted on Hengfan Forest Farm of Lin'an County for 17 years, with the results that 16 tree species were eliminated because of extremely bad growth' and low survival rate; that 5 species grew bushily with a low survival rate and bad growth; that 4 species grew ordinarily with survival rate being above 60% and that 16 species grew well with the survival rate being above 80%. Conifers such as Pinus taeda, P. elliottii and P. serotina grew well, with the amount of growing stock per unit area for 17-year-old trees being 1.0~1.7 times as large as that of masson's pine. Of 3 varieties of Chinese fir, grey-shoot Chinese fir grew best. Of broad-leaved species. Cinnamomum septentrionala, Sassafras tsumu, Choerospondias axillaris, Schima superba and Nyssa sinensis grew well, with the height, diameter at breast height and the amount of timber volume growth surpassing those of masson's pine on the same site, and the amount of annual timber volume growth per unit area being, on average, larger than that of masson's pine by 24.46%~65.96%. From the trial had "come the result that the conifers "and broad-leaved species men-tioned above showedfgreat promise of development and extension on the hilly ground of northwestern Zhejiang.