16种桤木属植物种子发芽和幼苗生长比较分析

为了研究桤木属植物不同种源和家系种子的发芽及幼苗生长情况，笔者对16种桤木属植物以及江南桤木10个家系的种子千粒重和发芽率以及苗期生长做了比较分析。结果表明，桤木属植物种子千粒重和发芽率差异较大，种子千粒重平均值为0.90 g，多数集中在0.5~1.5 g的范围内；桤木属植物种子的平均发芽率、发芽势分别为9.69%、5.4%，家系的平均发芽率及发芽势分别为20.40%、18.92%；桤木种子千粒重和发芽率相关性不显著。16种桤木中欧洲桤木的高、地径生长最大，分别达到32.12、7.03 mm，具有明显生长优势。

Comparative Analysis of Grain Weight and Germination Rate of 16 Different Provenances and Family Seeds on Alnus

In order to know seeds germination and growth of seedling of different provenances and families, the author analyzed and compared thousand seed weight and germination rate on 16 Alnus species, including 21 provenances and 10 families. The results showed that: thousand seed weight and germination rate of Alnus had much variation among different materials and the average thousand seed weight was 0.90 g and most of them ranged from 0.50 g to 1.5 g. The average germination rate was 9.69% in different species and 20.40% in different families, and the germination energy were 5.4% and 18.92% respectively. Correlation analysis did not have significance. The Alnus glutinosa with 32.12 cm height and 7.03 mm diameters of ground stem was the biggest among of them, and it had a certain potentiality to use in practice.