Allelopathy Effect of Aqueous Extracts of Different Tree Species on Accumulation of Al Element in Different Organs of Cunninghamia lanceolata Seedlings

The treatment effect with different aqueous extracts of different tree species on Al content and Al distribution rate in different organs of Cunninghamia lanceolata seedlings was measured 6 years after the application. The results showed that the higher concentrations of aqueous extracts of Schima superba, Pinus massioniana and C. lanceolata were, the higher Al contents in different organs of C. lanceolata seedlings were. Al contents in different organs of C. lanceolata seedlings that had been treated with high concentration aqueous extract of C. lanceolata were higher than those of seedling treated with aqueous extracts of S. superba and P. massioniana. As far as the Al distribution rate was concerned, high concentrations of C. lanceolata aqueous extracts had positive effect on promoting Al distribution rate in leaf, stem, bark and root, while high concentrations of aqueous extracts of S. superba and P. massioniana had positive effect on promoting Al distribution rate in stem, bark and root system of C. lanceolata seedlings.