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花楸树是我国东北林区重要的非木质资源树种.本文选取东北东部林区有代表性的花楸树分布区,采用样线法对花楸树的天然更新特点及其影响因素进行了调查分析.结果表明:在东北东部林区,花楸树以种子繁殖、桩蘖繁殖和根蘖繁殖3种方式更新;在未经破坏的天然林和恶劣生境下的天然林中,3种方式建成的幼苗数量比例各占1/3,无显著差异;但在破坏后形成的次生林中,桩蘖苗比例(16.5%)明显降低.桩蘖和根蘖更新能够维持当地居群的稳定,其中根蘖繁殖可使幼苗扩散到母株周围50cm或更远处;1.0～2.9cm的Ⅱ径级向3.0～4.9cm的Ⅲ径级的转化率很低,在破坏后形成的次生林、恶劣生境下的天然林和未经破坏的天然林中,Ⅱ径级向Ⅲ径级的转化率分别为25.6%、45.3%和15.9%.这是限制花楸树天然更新的关键环节.
Catalpa bungei is an important non-wood resource tree species in the northeastern region of China.In this paper, the representative area of Catalpa bungei tree in the eastern part of Northeast China was selected and the characteristics of natural regeneration and the influencing factors were analyzed by the sample-line method The results showed that: Sorbus tree regeneration in the eastern part of Northeast China in three ways: seed propagation, tillering and root tillering; in the natural forest without destruction and the natural forest under the harsh habitat, three ways were established The proportion of seedling in the secondary forest was significantly lower than that in the secondary forest formed after the damage, while the proportion of the tiller and tillering seedling decreased obviously (16.5%). The growth of the local population was able to maintain the stability of the local population. The tillering propagated the seedlings to 50cm or more around the mother plant. The conversion from the Ⅱ diameter of 3.0 ~ 2.9cm to the diameter of Ⅲ ~ 3.0 ~ 4.9cm was very low. After the destruction, the secondary forest formed in poor habitat In natural forests and unspoiled natural forests, the conversion rates from grade Ⅱ to grade Ⅲ were 25.6%, 45.3% and 15.9%, respectively, which was the key point to limit the natural regeneration of Sorbus Sorghum.