中国北方甘薯地农药使用对地下水水质的影响

Effect of Pesticides on Groundwater Under Sweet-Potato-Based Croppi ng Systems in Northern China

对河北和山东的典型甘薯种植地区的地下水进行了现场采样调查及室内样品分析,研究了涕灭威等农药对甘薯地地下水水质的影响。结果表明,部分农药已经对当地的地下水产生了一定的污染,农药在地下水中的残留与当地的地质状况、气候条件有很大关系。

Shallow groundwater is the main drinking water source for rural po p ulation in northern China. However, the quality of the groundwater has been dete riorating as a result of the use of pesticides on agriculture. To evaluate quali ty and safety of drinking water for the families in some of rural areas of Hebei and Shandong Provinces, a survey of pesticides residues in groundwater was cond ucted. This communication presents the results of the contamination of aldicarb, phorate, and terbufos in samples from 174 domestic wells located in sweet-pot ato-based cropping areas. Aldicarb was detected from 0.2 to 0.6 ìg稬-1 i n 12%, terbufos was 0.04 to 28.0 ìg稬-1 in 4%, and phorate was 0.1 to 6.3 ìg稬-1 in 11%of the wells from which water samples were taken. In a ddition to the properties of the pesticides and agricultural activities, our dat a indicated that the residues of the pesticides were influenced by the local geo logical and climatic factors. Sandy clay had less affinity to organic pesticides ; therefore, eluviation is enhanced in this condition. Precipitation is another major factor that determines the contamination level. Almost all of the contami nated sites were in sandy clay environment with relatively higher precipitation.