Allelopathic effects of exotic plant Larix kaempferi litters on Wolong native plants

Abstract:

In order to explore the allelopathy of leaf litter of Larix kaempferi on native plants, the effects of different concentrations (0.01, 0.05, 0.1 g/mL) of water extracts of Larix kaempferi litters (LkLWE) on seed germination and seedling growth of native plants were studied using petri dish filter paper method and pot soil culture method with 5 native plants in Wolong. The results showed that LkLWE had an effect on the seed germination and seedling growth of 5 native plants.1) The intensity of the comprehensive effect of the allelopathy of LkLWE on seed germination was in order of M.sativa > P.vulgaris > M.officinalis > P.depressa > E.dahuricus. The LkLWE mainly inhibited the seed germination of M.sativa, M.officinalis and P.vulgaris, and the inhibition degree was positively correlated with the concentration of the extract; the seed germination of E.dahuricus and P.dipressa showed a phenomenon of low promotion and high inhibition. 2) The intensity of allelopathic comprehensive effect of LkLWE on the growth of seedlings was in the order of M.sativa > M.officinalis >P.vulgaris > E.dahuricus > P.depressa. Among them, the extract mainly inhibited the seedlings growth of M.sativa and M.officinalis, and was positively correlated with the concentration. The LkLWE has a lo-promoting and high-inhibiting effect on the seedlings growth of E. dahuricus and P. vulgaris, and has always been a positive effect on the growth of P.depressa seedlings. The results suggest some management measures for artificial replanting under Larix kaempferi forest and increasing plant diversity.