| Abstrakt: |
By using ion exchange resin membrane as a plant root simulator, this paper studied the variations of soil nutrient availability and enzyme activities in a poplar plantation after applying phenolic acid. The exogenous phenolic acid had significant effects on the soil nutrient availability and enzyme activities, and the effects were concentration- and time dependent. With increasing phenolic acid concentration, the extraction mass of soil NH4+ -N and NO3- -N decreased significantly. At high concentration phenolic acid, soil PO4(3-) and Mn2+ availability increased significantly while soil K+ and Fe3+ availability was in adverse, and soil urease and phosphatase activities had a significant decrease while soil catalase and polyphenol oxidase activities increased significantly. With the elongation of incubation time, the availability of soil NH4+-N, PO4(3-), and Mn2+ increased gradually, while that of soil NO3- -N, K+, Fe3+, and Zn2+ decreased significantly. The correlation analysis showed that the availability of soil NO3- -N, K , Fe2+, and Mn2+ had close correlations with the activities of soil urease, polyphenol oxidase, and phosphatase. |
