三种吡唑类硝化抑制剂在潮棕壤中的垂直和水平迁移

分别利用土柱淋溶试验和水平扩散试验研究了3种吡唑类硝化抑制剂[3-甲基吡唑(MP)、3,4-二甲基吡唑磷酸盐(DMPP)和4-氯-3-甲基吡唑(ClMP)]随水在潮棕壤中垂直和水平迁移及与NH4+移动的同步性。结果表明,淋溶试验结束后(总淋洗量700 mm),各土层(0、10、20 cm)MP含量与NH4+-N含量的比值未发生变化,而DMPP和ClMP含量与NH4+-N含量的比值随土层深度增加显著降低。扩散试验结束后,在距圆心40 mm范围内,MP和DMPP含量与NH4+-N含量的比值均未发生较大变化,而ClMP含量与NH4+-N含量比值显著减小。研究结果说明,MP随水沿垂直和水平方向移动的速率几乎和NH4+一样,不存在同NH4+脱离风险,而DMPP和ClMP随水移动的速率比NH4+慢。

Vertical and horizontal movement of three pyrazole nitrification inhibitors in meadow brown soil

Through experiments of soil column leaching and horizontal dispersion,this paper studied the vertical and horizontal movement rate and the synchronization with NH+4 of three nitrification inhibitors 3-methylpyrazole(MP),3,4-dimethylpyrazole phosphate(DMPP),and 4-chloro-3-methylpyrazole(ClMP).The results showed that the ratio of MP content with NH+4-N content in meadow brown soil layers(0,10,20 cm)was unchanged when leaching experiment finished(leaching rate was 700 mm),but significantly decreased to DMPP and ClMP.The rario of MP or DMPP content with NH+4-N content changed nonsignificant when dispersion experiment finished,but significantly decresed to ClMP.These indicated that the movement rate of MP was uniform with NH+4,but the movement rate of DMPP or ClMP was slower than NH+4 in soil with water.