【摘要】 采用离子交换树脂膜作为根系模拟器,研究杨树人工林土壤在酚酸环境中养分有效性及酶活性的变化.结果表明:酚酸能显著影响杨树人工林土壤养分有效性和土壤酶活性,且二者受酚酸的影响具有显著的浓度效应和时间效应.随酚酸浓度增大,土壤中NH4+-N、NO3--N的提取量均显著下降.在高浓度酚酸环境中,PO43-、Mn2+的有效性显著提高,而K+、Fe3+的有效性被显著抑制;脲酶和碱性磷酸酶活性显著降低,而过氧化氢酶和多酚氧化酶活性则呈显著升高的趋势.随培养时间的延长,土壤中NH4+-N、PO43-、Mn2+的有效性逐渐增加,而NO3--N、K+、Fe3+、Zn2+的有效性显著降低.相关分析表明,脲酶、多酚氧化酶、碱性磷酸酶活性与NO3--N、K+、Fe3+、Mn2+等的有效性相关性较高.更多还原

【Abstract】 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 PO43-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,PO43-,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.更多还原