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Allelopathic Activity of Exotic Tree Rhus typhina

  • Rhus chinensis and Cotinus coggygria as reference species, the allelopathic effect of aqueous extract of leaves of R. typhina and aqueous extract of under forest soil of R. typhina stands on seed germination and seedling growth of 6 different plant species were studied in order to objectively evaluate its biological invasion. The results indicated that the germination capacity and germination potential of Brassica chinensis treated by aqueous intact fresh leaf extract of R. typhina were 88.0% and 82.5% respectively,with no significance compared with those of the control, while water extract of fresh broken leaves showed a very significant effect on germination of B. chinensis,with germination capacity and germination potential being reduced to 24.8% and 5.0% respectively. The allelopathic effect of dry leaves was weaker than that of fresh leaves. Wheat seed germination capacity and germination potential markedly decreased as 12.0% and 94.9% as those of the control by water extract of broken fresh leaves, while water extract of broken dry leaves only inhibited germination potential, which was 26.1% lesser than that of the control. The inhibition of water extract of broken fresh leaves of R. typhina on young wheat stem growth and radicle growth was stronger than that of R. chinensis and C. coggygria. Water extract of broken leaf of R. typhina displayed inhibition on seed germination of four native tree species in different degrees with significant impact on germination capacity of Toona sinensis and Ailanthus altissima. Water extract of broken fresh leaves of R. typhina did not influence the stem growth of young seedlings of four tree species, as well as the radical growth of Pinus tabulaeformis, but it significantly inhibited the radicle elongation of Platycladus orientalis, T. sinensis and A. altissima. Water extract of surface soil under R. typhina stands showed no inhibition on wheat seedling growth and the growth of T. sinensis was significantly promoted to 8.63 cm in height when it was cultivated for 55 days with the soil under R. typhina stands, compared to the control with 5.14 cm in height.
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Allelopathic Activity of Exotic Tree Rhus typhina

Abstract: Rhus chinensis and Cotinus coggygria as reference species, the allelopathic effect of aqueous extract of leaves of R. typhina and aqueous extract of under forest soil of R. typhina stands on seed germination and seedling growth of 6 different plant species were studied in order to objectively evaluate its biological invasion. The results indicated that the germination capacity and germination potential of Brassica chinensis treated by aqueous intact fresh leaf extract of R. typhina were 88.0% and 82.5% respectively,with no significance compared with those of the control, while water extract of fresh broken leaves showed a very significant effect on germination of B. chinensis,with germination capacity and germination potential being reduced to 24.8% and 5.0% respectively. The allelopathic effect of dry leaves was weaker than that of fresh leaves. Wheat seed germination capacity and germination potential markedly decreased as 12.0% and 94.9% as those of the control by water extract of broken fresh leaves, while water extract of broken dry leaves only inhibited germination potential, which was 26.1% lesser than that of the control. The inhibition of water extract of broken fresh leaves of R. typhina on young wheat stem growth and radicle growth was stronger than that of R. chinensis and C. coggygria. Water extract of broken leaf of R. typhina displayed inhibition on seed germination of four native tree species in different degrees with significant impact on germination capacity of Toona sinensis and Ailanthus altissima. Water extract of broken fresh leaves of R. typhina did not influence the stem growth of young seedlings of four tree species, as well as the radical growth of Pinus tabulaeformis, but it significantly inhibited the radicle elongation of Platycladus orientalis, T. sinensis and A. altissima. Water extract of surface soil under R. typhina stands showed no inhibition on wheat seedling growth and the growth of T. sinensis was significantly promoted to 8.63 cm in height when it was cultivated for 55 days with the soil under R. typhina stands, compared to the control with 5.14 cm in height.

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