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以连作I-107杨树(Populus×euramericana‘Neva’)人工林一代林非根际土为实验材料,采用室内培养的方法,在梯度酚酸浓度环境下,通过向土壤中施加铵态氮,分析酚酸浓度对硝化过程中NO_3-N和NH4-N的影响,采用NO_3-N和NH4-N的硝化作用动力方程模型,以阐明酚酸对土壤氮素循环的影响。研究结果表明:随着酚酸浓度的增加,NO_3-N的累积渐近值、NH4-N的消耗渐近值均逐渐减小;NO_3-N增加的最大速率逐渐减小,而NH_4-N消耗的最大速率并没有显著差异;NO_3-N增加和NH_4-N减少达到最大速率的时间均显滞后现象;土壤pH升高幅度逐渐增大,硝化回收率逐渐减小;对土壤硝化能力的抑制性加强。
The experiment was conducted in the field of Populus × euramericana’Neva ’artificial forest, using non-rhizosphere soil of Iupu-I-107 as the experimental material. Under the condition of gradient phenolic acid concentration, ammonium nitrogen was applied to the soil, The effects of concentration of phenolic acids on NO3-N and NH4-N during nitrification were analyzed. Nitric acid kinetic equation models of NO3-N and NH4-N were used to elucidate the effect of phenolic acids on soil nitrogen cycling. The results showed that the cumulative asymptotic values of NO 3-N and the asymptotic values of NH 4 -N consumption decreased with the increase of the concentration of phenolic acids. The maximum rates of NO 3 -N accumulation decreased gradually while the consumption of NH 4 -N The maximum rate of NO3-N and NH4-N decreased significantly; the increase of soil pH gradually increased and the recovery of nitrification decreased gradually; the inhibition of soil nitrification ability strengthen.