毒死蜱在海南几种典型土壤中的淋溶迁移

Leaching Behaviors of Chlorpyrifos in Several Typical Soils of Hainan

采用模拟土柱淋溶试验法对毒死蜱在不同土壤中的淋溶残留动态及其影响因素进行了初步研究。结果表明:毒死蜱在温度和湿度较高的酸性土壤中降解较快;淋洗水量对毒死蜱淋溶移动的影响较大,其在土壤中的最大淋溶深度随淋洗水量的增大而增加;土壤全N含量对毒死蜱在淋出水中含量增加起负作用,而土壤pH值对毒死蜱在淋出水中含量增加起正面作用;第10天时土壤全N和有机质含量与其呈显著正相关,土壤粘粒含量与其呈极显著正相关。

Simulated soil column leaching test method is employed for preliminary investigation into the leaching residue dynamics of chlorpyrifos in different soils and their affecting factors. The results are concluded as follows： chlorpyrifos degrade more quickly in acid soil of higher temperature and humidity; the influence of volume of leaching water on the leaching migration of chlorpyrifos is relatively larger, that is, the maximum leaching depth of chlorpyrifos in soil goes up as the volume of leaching water increases. The total N content in the soil has negative effect on the content of chlorpyrifos in the leaching water, and the PH value of soil plays the positive role. On the tenth day the total N content and organic content of soil has significantly positive correlation with the content of chlorpyrifos, and the correlation of soil clay particle therewith is extremely positive.