摘要
对水稻土中广灭灵残留消解动态及降解影响因子研究结果表明 ,广灭灵在 4种水稻土中降解符合 1级动力学方程C =C0 e-kt,其降解半衰期为 5 7～ 2 2 0d。广灭灵降解以微生物降解为主 ,土壤灭菌处理大大降低广灭灵降解速率 ,土壤理化性质、温度、湿度、pH值是影响广灭灵降解的重要因素。广灭灵降解速率与不同类型水稻土有机质含量呈显著负相关关系 ,相关系数为 - 0 8336。随温度上升而广灭灵降解有加速趋势 ,但常温 2 5℃时广灭灵降解速率高于 35℃处理 ,增加土壤湿度及施用石灰增加土壤
Residual dynamics and factors affecting degradation of clomazone in different paddy soils are studied in this paper. The results show that the degradation of clomazone answers to the first order kinetics equation C=C 0e - kt and its half life in four kinds of soils is 5 7～22 0d. Through sterilization, clomazone is degraded more slowly than the non sterilized one. The degradation of clomazone is dependent on the microorganisms and affected by soil properties, temperature, soil moisture and pH value. The distinct negative correlativity exists between the degradation speed of clomazone and organic matter content of different paddy soils, and the correlative coefficient is -0 8336. The process of degradation of clomazone is somewhat sped up in a certain degree with temperature increasing, however, the degradation speed of clomazone at 25℃ behaves faster than that at 35℃. With the soil moisture increasing and the addition of lime into soil, the degradation of clomazone will be accelerated.
出处
《中国生态农业学报》
CAS
CSCD
2004年第3期112-115,共4页
Chinese Journal of Eco-Agriculture
基金
农业部中美合作项目
北京市自然科学基金重大项目 ( 80 0 0 0 0 1)共同资助
