磷酸盐对农药草甘膦在不同土壤中迁移的影响

Influence of phosphate on the mobility of pesticide glyphosate in different soils

通过饱和土壤与恒定水流速率条件下的土柱混合置换实验,定量分析流出液中草甘膦浓度随时间变化的穿透曲线(BTCs)来预测其在环境中潜在的淋溶损失能力.结果表明,砂土中草甘膦的迁移能力大于红壤水稻土;对红壤水稻土来说,加磷酸盐有增加草甘膦移动性的趋势,砂土中情况刚好相反.因此磷酸盐对草甘膦移动性的影响效果视土壤类型的不同而异.

Through soil column miscible displacement test under the conditions of saturated soil and constant flow velocity the breakthrough curve （BTCs） of glyphosate concentration in effluent liquor changed with time was analyzed quantitatively to predict its latent leaching loss ability in environment. The movable ability of glyphosate in sand soil was greater than that in red-paddy soil, for which the addition of phosphate tended to enhance the movable ability of glyphosate; the state in sandy soil was just contrary. Therefore the influence effect of phosphate＇s on the movable ability of glyphosate differed in different soil types.