SEED GERMINATION AND SEEDLING GROWTH OF SEVERAL TREE SPECIES IN LOWER SUBTROPICAL FOREST
南亚热带森林几种乔木种子萌发和幼苗生长观察

Seeds of Toona sinensis (A. Juss.) Roem., Oroxylum indicum (L.) Vent., Quercushui Chun, Paulownia fortunei (Seem.) Hemsl., Diospyros morrisiana Hance and Berchemiadulcis Thunb. were collected from Guangdong and Guangxi. Seed germination and seedlinggrowth of these tree species were examined under different light and fertilizer conditions.The experiments showed that the germination percentage of seeds of T. sinensis (A. Juss.)Roem., Q. hui Chun and D. morrisiana Hance under light shade (55% of natural light) were74%, 90% and 30%, respectively, and O. indicum Vent. under deep shade (38% naturallight) was 80%. However, the highest germination percentage of B. dulcis Thunb. observedunder natural light condition was 15%. The seedlings of T. sinensis (A. Juss.) Roem., O.indicum Vent., P. fortunei (Seem.) Hemsl. and B. dulcis Thunb. grew fast, especially underlight condition, showing that they are fast-growing trees. The seedlings of Q. hui Chun andD. morrisiana Hance showed slow growth, and they grew better under lightshade. Thebiomass and rate of height in growth of all the seedlings increased markedly with the intreaseofapply in gurea.