表面活性剂影响下的紫色土氮素垂向迁移风险

采用模拟淋溶试验,研究了表面活性剂十二烷基苯磺酸钠(SDBS)对紫色土氮素的垂向迁移的影响.SDBS减少紫色土铵态氮的淋溶损失,且SDBS浓度越高,铵态氮损失越少.SDBS促进紫色土硝态氮的淋失,累积淋失量依次为SDBS100SDBS40SDBS0SDBS5.低浓度SDBS抑制紫色土总凯氏氮(TKN)损失,但高浓度SDBS则显示促进作用,SDBS40、SDBS100的TKN累积淋失量分别较SDBS0增加了16.8%、22.36%.SDBS淋溶影响紫色土氮素的垂向分布,紫色土氮素有明显向下迁移的趋势,且SDBS浓度越高,迁移性越强.

Vertical Transporting Risk of Nitrogen in Purple Soil Affected by Surfactant

The simulated leaching experiment was conducted to determine the effects of surfactant of sodium dodecyl benzene sulphonate (SDBS) on vertical transporting of nitrogen in purple soil. SDBS could reduce NH⁺₄-N loss from soil, and the higher concentration of SDBS, the less loss. SDBS could increase NO^-₃-N loss from soil, and the order of accumulation loss is SDBS₁₀₀>SDBS₄₀>SDBS₀>SDBS₅. Lower concentration SDBS decrease TKN loss, but higher concentration SDBS had a reverse effect, and compared with SDBS₀, the accumulation loss TKN of SDBS₄₀, SDBS₁₀₀ increased by 16.8%, 22.36%, respectively. SDBS could affect vertical transporting of nitrogen in purple soil, that is, the significant down-transporting of nitrogen was observed after leaching with SDBS, and the higher concentration of SDBS, the more obviously transporting trend.