【摘 要】
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A 21-day laboratory incubation experiment was conducted to investiga t e the impact of pesticides (insecticide, herbicide, fungicide) on paddy field so il healt
【机 构】
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College of Environmental and Resource Sciences
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A 21-day laboratory incubation experiment was conducted to investiga t e the impact of pesticides (insecticide, herbicide, fungicide) on paddy field so il health under controlled moisture (flooded soil) and temperature (25 ℃) envir onment. The electron transport system (ETS)/Dehydrogenase activity showed negati ve correlation with pesticides concentrations, decreased with increase of pesti cide concentration. The higher doses(5 to 10 times field rates) of pesticides si gnificantly inhibited ETS activity, while lower rates failed to produce any sign ificant reducing effect on the control. The toxicity of pesticides in decreasing the ETS activity was in the order: insecticide > fungicide > herbicide, irrespe ctive of their rates of application. The pesticides increased the soil phenol co ntent, which increased with increasing concentration of agrochemicals. The pesti cide application did not produce any significant change in soil protein content. The response of biomass phospholipid content was nearly similar to that of ETS activity. The phospholipid content decreased with the addition of pesticides in the order insecticide > fungicide > herbicide and the toxicity was in the order: 10 FR (field rate) > 5 FR > 1.0 FR > 0.5 FR > control.
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