除草剂拉索对地下水影响研究

INFLUENCE OF ALACHL ON GROUNDWATER

研究了除草剂拉索在滨海冲积沙壤中的残留及其对浅层地下水的影响，并用ＰＲＺＭ模型进行计算机模拟．两年连续试验结果表明，拉索在施药区内的浅层地下水中均有检出．在施药区外１０ｍ处，施药６０ｄ后亦有检出．降雨对其移动影响显著．拉索在土壤中残留动态的田间测定结果与计算机模拟基本一致．根据现有结果认为，拉索可在我国使用，但使用地区应作适当限制．

Alachlor residues in soil and their effect on shallow groundwater afterbeing applied to coastal alluvial sandy loam in Hai’an cotton area werestudied and simulated with PRZM Model provided by USEPA.Two yearsexperimental results indicated that Alachlor could be detected in groundwaterat pesticide application area within 30 days and 10 meters outside the appliedarea within 60 days.Precipitation after pesticide application had a greatinfluence on pesticide movement.The Alachlor concentration of groundwaterin 1989 was higher than in 1990 because of immediate rain after the applica-tion.The measured data in soil were close to the simulated results.