酸雨对表面活性剂促进土壤氮素垂向迁移的强化效应

Effect of Surfactant on Vertical Transfer of Nitrogen in Soil as Affected by Acid Rain

采用模拟淋溶试验,研究了酸雨对表面活性剂十二烷基苯磺酸钠(SDBS)促进土壤氮素垂向迁移的强化效应。结果表明,酸雨淋溶时,SDBS尽管抑制了铵态氮的淋溶损失,但促进了硝态氮的淋溶损失;土壤SDBS含量越高,铵态氮淋溶损失越小,硝态氮淋溶损失越大;土壤SDBS促进了土壤氮素的淋溶损失,且这种损失受酸雨pH值影响较大,酸度越大,土壤全氮、铵态氮、硝态氮的淋失量也越大。

A soil-column simulation experiment was conducted to determine if acid rain can influence the leaching loss of nitrogen in soil which was enhanced with the existance of a surfactant,sodium dodecyl benzene sulfonate （SDBS）.The results showed that the application of SDBS could reduce the leaching loss of ammonium nitrogen,but promoted the loss of nitrate nitrogen under acid rain.With the increase in the content of SDBS in soil,the leaching loss of ammonium nitrogen was decreasing and leaching loss of nitrate nitrogen was increasing.The leaching loss of soil nitrogen was significantly dependent on the pH values of acid rain.The lower pH of acid rain,the more leaching loss of total nitrogen,ammonium nitrogen and nitrate nitrogen were.