Subjects: Biology >> Botany >> Applied botany submitted time 2021-11-04 Cooperative journals: 《广西植物》
Abstract： To explore whether the allelopathy of Metasequoia glyptostroboides litter is an obstacle to its natural regeneration, eight concentrations (200, 100, 50, 20, 10, 5, 2, 1 g·L-1 and CK) of aqueous extracts from fresh andnatural litter of M. glyptostroboides were set to analyze the allelopathic effects of aqueous extracts from different types and concentrations on seed germination and growth of M. glyptostroboides. The results were as follows: (1) The aqueous extract of the fresh M. glyptostroboides litter had no significant effect on seed germination rate and germination potential (P>0.05), but had significant effect on germination index (P<0.05), and seed germination was significantly inhibited by 1, 100, 200 g·L-1 treatments. The effects of aqueous extract of the natural M.glyptostroboides litter on three indexes of seed germination were not significant (P>0.05), but the inhibitory effect was reflected in 5, 10, 50, 200 g·L-1. (2) The shoot length, hypocotyl and primiary root length of M.glyptostroboides seeds were significantly different between different concentrations of fresh and natural litter aqueous extracts (P<0.05), and decreased gradually with the increase of aqueous extract concentration (≥10 g·L-1), especially in the range of 50~200 g·L-1. (3) Compared with seed germination, the aqueous extracts of fresh and natural M. glyptostroboides litter had stronger inhibitory effect on the growth of seeds after germination, and the allelopathic effect of fresh litter was stronger than that of natural litter. (4) The primary root length was the most sensitive to allelochemicals among seed germination and growth indexes. (5) The dynamic change of shoot length growth of M. glyptostroboides seeds accords with the “S” growth curve (R2≥0.988). The litter of M. glyptostroboides had a certain allelopathic inhibitory effect on its own seed germination and growth, which affected the natural regeneration of its population. It was suggested that the litter under the forest should be properly cleaned to promote the natural renewal of the M. glyptostroboides population in the management of M. glyptostroboides populations.
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