Allelopathy effects of aqueous extracts of aerial parts of several associated plant species on the growth of Chinese fir seedlings

The growth of Chinese fir(Cunninghamia lanceolata)seedlings treated with aqueous extracts of aerial parts of 8 kinds of associated plants and those of Chinese fir itself in different consistencies levels(1evel I：166．7g／kg，level II：83．3g／kg，level III：41．7g／kg，levelⅣ ：20．8g／kg)were surveyed for 6 years．The results show that all the Chinese fir seedlings treated with the aqueous extracts of these associated plants grow faster than those of treated with aqueous extracts of Chinese fir itself(control I)and treated with clean water only(control 1I)．The order of promotion of the aqueous extracts of the plants to height and base diameter growth of Chinese fir seedlings is level I >level II>level III>level Ⅳ >control1 ，and the order of promotion of the aqueous extracts of the plants to height growth of Chinese fir seedlings is Schima SIArperba> Loropetalum chinense> Photinia davidsoniae> Woodwardia japonica > Castanopsis rgesii>Syzygium buxifolium>Pinus massoniana>Dicranopteris dichotoma>Cunninghamia lanceolata(control I)．