一、前言林木杂种优势的利用是提高林业生产率的有效措施之一。七十年代以来广西林科所选育的柳桉_1×窿缘桉_(173)(简称柳窿桉)速生高产,干形通直圆整,材质优良,适宜造纸,杂种优势十分明显。在广西南北栽培,不仅性状稳定,而且大大超过同期栽培的其他桉树,深受群众欢迎,培育的林木葱郁, I. Preface The utilization of forest tree heterosis is one of the effective measures to improve forestry productivity. Since the 1970s, Guangxi Linke selected Liu Eucalyptus _1 × margin Eucalyptus _ (173) (referred to as willow eucalyptus) fast-growing high-yielding, stem-shaped straight round, good material, suitable for paper making, the hybrid advantage is obvious. Cultivation in north and south of Guangxi, not only stable in character, but also greatly exceeded other eucalyptus cultivated in the same period, welcomed by the masses, nurturing the lush forests,