理化性质对土壤吸附-解吸苄嘧磺隆的影响  

Effects of Soil Physicochemical Properties on the Adsorption-Desorption of Bensulfuron-Methyl

作　　者：曾芳[1,2] 刘忠珍[1] 王荣辉[1] 黄玉芬[1] 李倩[1] 

机构地区：[1]广东省农业科学院农业资源与环境研究所,农业部南方植物营养与肥料重点实验室,广东省养分资源循环利用与耕地保育重点实验室,广东广州510640 [2]广东环境保护工程职业学院,广东佛山528216

出　　处：《环境科学研究》2015年第7期1107-1113,共7页Research of Environmental Sciences

基　　金：国家自然科学基金项目(40901113);广东省自然科学基金项目(8451064001001121)

摘　　要：为探讨土壤理化性质对其吸附-解吸BSM（苄嘧磺隆）的影响,采用批量平衡法研究了采自我国东南沿海和中部14个省区的21个土壤样品对BSM的吸附-解吸行为,以及BSM吸附-解吸行为与土壤p H、w（有机质）、w（TN）、w（黏粒）、CEC（阳离子交换量）等理化性质的关系.结果表明：BSM在土壤中的等温吸附线可用Freundlich方程进行拟合,不同土壤对BSM的吸附强度差异较大,Kf（Freundlich常数）介于0.52~24.05之间.土壤p H、w（有机质）是影响BSM吸附的主要因素,二者对Kf的解释率为58.1%;土壤对BSM的吸附还受w（TN）、w（黏粒）等的影响.土壤对BSM的吸附-解吸存在滞后现象,HI（迟滞系数）与土壤p H呈极显著负相关,与w（黏粒）呈显著正相关,其中土壤p H对HI的解释率为33.0%.吸附平衡溶液p H与Kd（分配系数）呈极显著负相关,对其进行调节可显著改变土壤对BSM的分配能力.In order to investigate the influence of soil physicochemical properties on the adsorption-desorption of BSM（ bensulfuronmethyl） in soils,equilibrium batch experiments were carried out using 21 soils collected from 14 provinces located in the southeast coast and central China. The correlations between soil p H,w（ OM）,w（ TN）,CEC,w（ clay） and the adsorption-desorption of BSM in soils were also studied. Experimental data indicated the adsorption isotherms of BSM could be well described by the Freundlich equation,and the adsorption capacity varied widely in different soils with Kf（ Freundlich coefficient） values ranging from 0. 52 to 24. 05. Multiple linear regressions were used to determine the relationships between soil properties and the Kfor hysteresis index（ HI） of bensulfuron-methyl.The values of p H and w（ OM） were the main factors affecting bensulfuron-methyl adsorption behavior,as they could depict 58. 1% of the variation of Kfvalue. The w（ TN） and w（ clay） also had effects on the adsorption. The adsorption-desorption hysteresis of bensulfuronmethyl existed in all 21 tested soils. The HI had a significantly negative correlation with p H,and a positive relationship with the clay content. The p H could depict 33. 0% of the variation of HI value. The adsorption equilibrium p H was significantly negatively correlated with the distribution coefficient（ Kd） of bensulfuron-methyl in soil, and adjusting the adsorption equilibrium p H could significantly change the soil＇s capacity to distribute BSM.

关 键 词：土壤理化性质 吸附-解吸 苄嘧磺隆 滞后现象 

分 类 号：X131.3[环境科学与工程—环境科学]