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中文摘要：
通过模拟方法研究了豆磺隆，呋喃丹2种农药与重金属汞（Hg）单一及复合污染对草甸棕壤和黑土4个土壤转化酶活性的影响．结果显示，在试验浓度范围内，土壤添加豆磺隆和呋喃丹后，转化酶变化幅度分别为-12％～7％和6％～7％，表明2种农药对土壤转化酶的毒性较小；Hg对转化酶最大抑制率为22％～35％，二者之间呈显著的对数负相关关系，表明Hg对转化酶的毒性较大，转化酶在一定程度上可作为Hg污染的监测指标，通过对数方程计算出4个土样的生态剂量（ED50）分别为76.68，727．49，236．52．316．59mg/kg;Hg和2种农药之间普遍存在交互作用．豆磺隆与Hg复合污染引起土壤转化酶最大净变化量（△I）为对照的-12％～5％，呋喃丹和Hg为-25％～6％，有机质对复合污染产生的毒性有明显的缓冲作用．
英文摘要：
Through simulative methods, the influence on the soil invertase activity of 4 soils of grassy marchland brown and black soils by the single and joint pollution of 2 kinds of pesticide chlorimuron-ethyl, furadan and heavy metal mercury was studied. In the range of test concentration, the varying extents of invertase were -12%～7%, -6%～7% respectively after addition of chlorimuron-ethyl and furadan into the soil, showing that the toxicity of two pesticides was small relatively; the maximum inhibition rate on invertase by Hg was 22%～35% showing market negative correlation between invertase activity and Hg contamination. Hg has higher toxicity on invertase; invertase activity could be definite degree a monitoring index of Hg contamination. The ecological doses （ED50） of 4 soil samples were 76.68, 727.49, 236.52 and 316.59mg/kg respectively. There existed generally mutual action between Hg and two kinds of pesticides. The joint pollution of chlorimuron-ethyl and Hg induced the greatest net varying amounts （△I） of soil invertase were -12%～15% of the contrast and -25%～6% for furadan and Hg. Organic substance had obvious buffering action on the toxicity produced by joint pollution.
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