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采用室内模拟方法研究了三唑磷在水稻-水-土壤中的分布、迁移及消解情况,探讨了三唑磷的消解与环境温度、光照及降雨的关系。结果表明:于水稻苗期喷施药液,0～3 d内三唑磷主要分布在田水和土壤中,第7 d至试验结束时则主要吸附、积累于水稻植株中;三唑磷在水稻、田水和土壤中的消解半衰期分别为4.45、1.56和5.24 d,相互间存在显著差异(P<0.05);在不同温度(25、35、50℃)下,三唑磷的水解半衰期分别为35.13、19.76和3.97 d,其消解速率随温度升高而显著加快(P<0.05);在照度为19 000 lx、不同光周期(10 h/d、14 h/d)下,三唑磷在水稻上的消解半衰期分别为5.70和4.17 d,14 h/d下的消解速率显著高于10 h/d下的(P<0.05);模拟降雨试验中,三唑磷在水稻植株上的残留量随雨强的增大而显著减小(P<0.05),在固定雨强条件下,施药后2 h内降雨对植株上残留三唑磷的冲刷作用较为明显(P<0.05)。
The distribution, migration and digestion of triazophos in rice - water - soil were studied by indoor simulation method. The relationship between triazophos digestion and ambient temperature, light and rainfall were discussed. The results showed that triazophos were mainly distributed in the field water and soil during 0-3 days at the seedling stage of rice seedlings, and mainly absorbed and accumulated in the rice plants at the end of the 7th day. Triazophos The half-lives of digestion in rice, field water and soil were 4.45,1.56 and 5.24 d, respectively, which were significantly different from each other (P <0.05). The half-lives of triazophos hydrolysis at different temperatures (25, 35 and 50 ℃) (P <0.05) at 35.13, 19.76 and 3.97 d, respectively. Under the illumination of 19 000 lx and different photoperiod (10 h / d, 14 h / d), triazophos The half-lives of digestion in rice were 5.70 and 4.17 d, respectively, and the digestion rates at 14 h / d were significantly higher than those under 10 h / d (P <0.05). The residuals of triazophos on rice plants (P <0.05). Under the condition of fixed rainfall intensity, the raining effect of residual triazophos on plants within 2 h after spraying was more obvious (P <0.05).