东北地区白桦繁育要点、生长节律及天然更新技术探析

Research on Breeding Keys, Growth Rhythm and Natural Renewal of Birch in the Northeast of China

白桦是东北林区广泛分布的落叶乔木,在其生长过程中,具有抗病能力强、生长迅速、抗逆转性好等优点,具有良好的适应性,东北大部分山区都能很好的生长,是东北地区林业工程中重点栽植的乡土树种,其主要用于人工针阔混交林、天然林保护及三北防护林等。本文介绍了白桦育苗繁殖的原则及要点,分析了白桦在辽北地区的生态特征及生长节律,并对其在生长过程中的天然更新技术及方法进行了探讨。

Birch is a deciduous tree widely distributed in Northeast forest area.In the process of its growth,birch has the advantages of strong resistance to disease,rapid growth,good resistance to reversal and good adaptability.For most mountain areas in Northeast China,it is a local tree species which is mainly used in forest industry in Northeast China.It is mainly planted in artificial coniferous and broad-leaved mixed forest,natural forest protection and three-north protection forest,etc.This paper first introduces the principle and keys of breeding and propagation of birch,analyzes the ecological characteristics and growth rhythm of birch in Northern Liaoning Province,and probes into the natural renewal techniques and methods of birch in the process of growth.