异丙隆在土壤中的淋溶迁移及其影响因素研究

采用室内土壤淋洗柱法,以黄褐土、砂姜黑土和水稻土为供试土壤,研究了异丙隆在土壤中的淋溶迁移行为,探讨了淋溶水量、淋溶水pH值、施药量和添加外源木炭等因素对异丙隆在土壤中淋溶迁移的影响。结果表明,不同土壤中异丙隆淋出率为黄褐土〉砂姜黑土〉水稻土;淋溶水量与异丙隆的淋出率呈正相关,且对淋溶后异丙隆在土层中的分布有明显影响;用不同pH值的淋溶水时,异丙隆的淋出率为pH5〉pH9〉pH7;施加不同药量时,异丙隆的淋出率为10mg〉5mg〉20mg;异丙隆的淋出率随外源木炭添加量的增大而减小,而异丙隆在土壤柱中的滞留量则随着木炭添加量增大而增大,提示添加外源木炭可明显减少异丙隆在土壤中的淋出率,降低异丙隆在土壤中的淋溶深度。

Leaching Behaviors of Isoproturon in Soils and Its Influencing Factors

In this paper,leaching behaviors of isoproturon in soils and its influencing factors,such as the water volume,the pH value of leaching water,pesticide application rates and charcoal amendment,were studied using the soil column leaching method.The results showed that the amount of isoproturon leached in leachate in different soils followed the order yellow brown soilshajiang black soilpaddy soil.The amount of isoproturon reclaimed in leachate increased with the water volume increasing.The distribution of isoproturon in soils was significantly influenced by water volume.The amount of isoproturon leached from soils varied with pH values,and followed the order pH5 pH9 pH7.Under the different pesticide application rates,the amount of isoproturon leached in leachate followed the order 10 mg5 mg20 mg.The amount of isoproturon in leachate decreased with the increase of charcoal addition to soil,while the residue of isoproturon in soils increased with charcoal content of soil samples.Charcoal amendment can significantly reduce the isoproturon leaching in soil.