泡桐干形培育研究进展

在我国北方泡桐栽培区由于泡桐顶芽在冬季枯死，通过假二叉分枝的方式进行自然接干，造成出材率低，尖削度大，树干形数小，给泡桐的木材生产带来了巨大的损失。为此我国的泡桐科研工作者经过近４０年的努力，对泡桐干形进行了遗传改良，并在此基础上，围绕干形培育对泡桐的高干壮苗、人工接干、修枝、栽培密度与干形、混交与干形及其上述栽培管理措施与泡桐丛枝病的关系等问题进行了一系列研究。本文对我国泡桐干形培育的上述研究进行了综述，并对泡桐干形培育若干亟待解决的问题进行了讨论。

THE ADVANCES OF PAULOWNIA STEM FORM CULTIVATION RESEARCH

Paulownia is a famous fast growing species with characteristics of fast growing, super property and multi purpose and a major species for afforestation in plain region and etc. Since Paulownia top buds die of frost in the north of China, its natural trunk extension forms by means of fake two fork branches. Thereby, Paulownia has grest sharp degree of stem, small stem form rate, and its wood production is greatly lost. Therefore, For near 40 years Paulownia researchers have been studying Paulownia stem form including heredity improvement of Paulownia stem form, Paulownia robust nursery stock cultivation, artificial trunk extension, prune, the relationship between density of stand andmingled plantation and Paulownia stem form as well as the relationship between above mentioned measures and Paulownia witches broom etc. All research contents Above mentioned are summarized and a certain number urgent problems about Paulownia stem form cultivation are put forward and discussed in this paper.