土壤中反硝化作用的试验研究

Experimental Study on Denitrification in Soil

通过室内土柱试验,研究了土壤中的反硝化作用机理及其影响因素.假设反硝化作用符合一级反应的离散方程,描述土壤中NO_3^-离子的输运迁移规律.此方程反映了NO_3^-浓度、土柱淋溶时间、柱深、反应速率常数和溶液平均流速的函数关系.结果表明,环境条件(如温度,pH值、基质NO_3^-浓度等)是影响反硝化作用反应速率的重要因素.

The law of and environmental influencing factors on denitrification in soil have beenstudied through soil-column experiments. Dispersion equations with first-order reaction rates fordenitrification are applied to describe the convective transport of NO3- in soil. In the equations theconcentration of NO3- is considered as a function of position, time, rate constants, and the averagepore water velocity. The results show that environmental conditions, such as temperature, pH, theaverage pore water velocity and the concentration of NO3~ are main factors influencing the rate ofdenitrification.