水青冈种子萌发研究

水青冈是我国中亚热带常绿阔叶林中的优势树种之一,其成熟林内尽管每年有大量种子散落,但实生苗极少.本研究比较4种打破水青冈种子休眠的方法,结果表明:(1)种子种皮切伤和去除种皮后,发芽率增大,均超过了90.0%,并提早12 d萌发;(2)100ms/L的赤霉素浸种效果最好,发芽率为72.2%,提早5 d萌发;(3)随着低温干藏时间的延长,水青冈种子的发芽率也提高;(4)经40℃处理后种子的萌发效果最好,发芽率达76.8%.

Study on Seed Germination Characteristic of Fagus longipetiolatis

Fagus longipetiolat is one of dominant species in middle subtropical evergreen broadleaved forests of China. There are few seedlings from seeds of F. longipetiolat in mature F. longipetiolat forests,although a large number of seeds drop every year. The efficiencies of four treatment methods for breaking dormancy seed of F. longipetiolat were compared. The main results were as follows:(1) Incisive and removed seed coat were effec tive in raising the germination rates,an above to 90%. The germination time was shortened 12 d in comparison with control; (2) The seeds soaking in 100 mg/L GA_3 were optimum, and the germination rate was 72. 2%. The germination time was shortened 5 d in comparison with control; (3) The germination rate of F. longipetio lat seeds promoted with the time of dry storage under low temperature prolonged; (4) The treatment with 40 ℃ was the optimum for breaking dormancy of longipetiolat seeds, and the germination rate was 76. 8%.