硫代硫酸铵对土壤硝化作用的影响

EFFECT OF AMMONIUM THIOSULFATE ON SOIL NITRIFICATION

本研究通过室内土壤培养试验，研究了石油化工副产品硫代硫酸铵（ATS）对土壤硝化作用的影响。研究结果表明，ATS对土壤硝化作用有着明显的抑制作用。当ATS用量达2500μg／g土时，培养14天后抑制率仍可达82％；ATS有效地抑制了由铵经生物氧化作用生成硝态氮的反应，这种反应是由硫代硫酸根及其氧化产物共同作用产生的。

A study was carried out to determine the effect of ammonium thiosulfate (ATS),a byproduct of petroleum refinery, on nitrification and to find its possible mechanism.These objectives were addressed by applying nitrogen fertilizer (urea) in combination with application of thiosulfate at different rates and simultaneously measuring changes in urea-N, NH+4, NO-3, and NO-2, at various bine in the course of incubation as well as thiosulfate transformation. The results indicated that ATS applied to the soil was rapidly hydrolyzed with an accumulation of tetrathionate and sulfate. Urea was completely hydrolyzed within 3 days with a rapid increase of animonium content in the soil. The formation of nitrate from ammonium was markedly suppressed by the application of ATS. ATS is a promising nitrifieation inhibitor. At the highest rate of ATS(2500μg ATS/g soil) nitrification inhibition over 14 days was 82%. The inhibiiton of ATS in this study occurred in the initial period of nitrification and was caused by thiosulfate and its oxidation products such as tetrathionate.