摘要
运用模拟太阳光,探讨了咪唑烟酸在浙江4种典型土壤表面的光解动力学特征,分析了不同添加浓度,不同光强对其降解动力学的影响。结果表明,4种土壤的光解快慢顺序为:黄筋泥>黄红壤>海涂土>小粉土,其中最快的降解速率是最慢的1.38倍;影响光解半衰期最主要的因素为土壤的酸碱度,呈正相关,即土壤的pH值越高,其半衰期越长;而在光照强度较高,添加浓度相对较低的情况下,咪唑烟酸的降解较快。咪唑烟酸在不同湿度土壤中的光解深度明显不同,在风干土壤中,4种土壤的光解深度分别在0.07～0.14mm之间;而在60%田间持水量的土壤中,4种土壤的光解深度比风干土壤平均提高2～3倍。
Photolytic dynamic was probed on the surface of four kinds of soils ,which were typical in Zhejiang province, under simulated sunlight, using differ ent fortified concentrations, light intensity on decomposition were also evaluat ed. The results showed that photolytic rates were in a following order huangjin mud >yellow red loam soil >coast soil > powder soil. Off them, the fastest degra dation rate was 1.38 times as the slowest one. The most remarkably influencing f actor was pH values that were proportional to photolytic half-life of imazapyr . With increase of light intensity and decrease of the fortified concentrations, the degradation of imazapyr was fast. The photolytic depth of imazapyr in fou r air-dried soils varied from 0.07 to 0.14 mm, while it increased 2 or 3 times in 60%WHC as deep as in air-dried soil on averaged.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第5期944-948,共5页
Journal of Agro-Environment Science
基金
德国BASF公司资助项目
关键词
咪唑烟酸
光解速率
光照强度
土壤表面
imazapyr
photolytic rate
light-intensity
surface of soil
