敌草胺在植烟土壤中的降解规律  

Study on Degradation Characteristics of Napropamide in Tobacco Soils

作　　者：洪文良 吴小毛[2] 

机构地区：[1]贵州省贵阳市金阳新区农林水利服务中心,贵州贵阳550081 [2]贵州大学农学院植物保护系,贵州贵阳550025

出　　处：《贵州农业科学》2012年第6期201-206,共6页Guizhou Agricultural Sciences

基　　金：贵州省科学技术基金项目[黔科合J字(2010)2074];贵州大学博士基金项目[贵大人基合字(2011)06]

摘　　要：为了探明除草剂敌草胺的残留污染风险与控制途径,为其安全使用提供参考,采用高效液相色谱法研究了敌草胺在贵州植烟土壤中的降解动态及影响因素。结果表明:1)敌草胺在植烟土壤中的降解过程均符合一级动力学特征,降解速率与土壤性质、环境因素及其浓度有关。2)影响敌草胺在土壤中降解的因素主要是有机质含量,土壤中敌草胺的降解速率随有机质含量的升高而加快。3)外界环境条件和敌草胺施用水平对其降解速率的影响也较大,即环境温度越高、湿度越大、喷施的敌草胺浓度越低,则降解速率越快。4)敌草胺在灭菌土壤中的半衰期大于未灭菌土壤,即微生物是敌草胺在植烟土壤中降解的主要途径。In order tO provide the basis for safe use, residual contamination risk and control means of napropamide, the degradation characteristics and degradation influence factors of napropamide in the tobacco field soils was investigate under controlled environmental conditions in the laboratory using HPLC. The results showed that： 1） the degradation of napropamide in tobacco soils was fitted to the firstorder kinetics and its degradation rates was related to the soil properties, environmental factors and concentrations. 2） The main factor that influenced the degradation of napropamide in soil was soil organic matter. The degradation rate of napropamide appeared to increase with increasing organic matter content in soils. 3） The environmental factors and application levels also affected degradation of napropamide in soil. That＇s to say, the degradation was faster with the higher temperature, higher humidity and lower concentration of napropamide. 4） The half-life of napropamide in sterilized soil was greater than that in non- sterilized soil, which indicated that microorganism was the principal pathway for the degradation of herbicide in the tobacco planted soil.

关 键 词：敌草胺 植烟土壤 残留 降解规律 除草剂 

分 类 号：S482.46[农业科学—农药学]