土壤含水量与氮化合物迁移转化的相关性分析

Correlation between soil moisture and transport and transformation of nitrogen compounds

在蒸渗仪内进行的灌溉实验结果表明,土壤含水量的变化是影响溶液中有机质和氮化合物迁移转化的主要因素.降雨和灌溉以后,随土壤含水量的上升,微生物活性增强,有机物分解和成氨作用速度加快,COD和NH+4 N离子浓度的提高加速硝化作用的进行,但土壤4 N浓度随之增加.NH+含水量的增加也同时加速了NO-3 N浓度之间3离子的淋溶和反硝化作用,因此,土壤含水量与NO-没有很好的相关性.

Experiments of wastewater irrigation in lysimeters show that the soil misture is a main factor affecting the transport and transformation of N compounds. The increase of soil moisture caused by rainfall and irrigation inspires the activities of microorganism and accelerates the decomposition of organic matters, prompting ammonification and raising the concentrations of COD and NH+4N. Even though the increase of NH+4N accelerates the process of nitrification, the rise of soil moisture speeds up leaching and denitrification of NO-3 simultaneously, therefore, no good correlation exists between the soil moisture and the concentration of NO-3N.