• 关键词：乙撑硫脲  光解  土壤湿度  土壤温度  土壤厚度  光解深度

• 基金项目：

• 岳永德
• 安徽农学院植物保护系,合肥

• 摘要：研究了土壤湿度、温度和厚度对乙撑硫脲土壤光解的影响,并探讨了这一光解的深度和机制。实验结果表明,土壤湿度对乙撑硫脲光解有最显著的影响;光照下,总放射性在湿土中迅速向土表转移并集中于土表,而在干土中则不发生这种转移;乙撑硫脲在表土层以下2-5mm的土壤中也能发生光解。提出了乙撑硫脲的土壤中的光解,不是直接光解,而是需要O₂存在的间接光解的机制。

• Abstract：A study on the effects of soil moisture, temperature and thickness on the photodegradation of ETU in soil revealed that the total radioactivity moved rapidly to the surface layer of humid soil while no such movement was observed in air dried soil. The photodegradation occurred in the soil layer of 2-5 mm as well. A mechanism of indirect photolytic reaction was proposed.

• Key words：ethylenethiourea  photodegradation  soil moisture  soil

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