南方主要土壤中铁铝氧化物对土壤吸附Bt蛋白的影响  

Effects of Fe and Al Oxides on Adsorption of Bt Toxin by Several Soils in South of China

作　　者：付庆灵[1] 邓雅丽[1] 胡红青[1] 蔚霞[1] 韩晓芳[1] 李妍[1,2] 

机构地区：[1]华中农业大学资源与环境学院,武汉430070 [2]天津市农业资源与环境研究所,天津300192

出　　处：《中国农业科学》2012年第23期4836-4843,共8页Scientia Agricultura Sinica

基　　金：国家自然科学基金(41001140和40671087);湖北省自然科学基金(2010CDB10002)

摘　　要：【目的】研究Bt蛋白与南方主要土壤(砖红壤、赤红壤、红壤和黄壤)的相互作用,探讨不同形态铁铝氧化物对吸附的影响。【方法】采用平衡吸附法研究Bt蛋白在不同土壤上的吸附特征,并用Langmuir方程进行拟合。【结果】Bt蛋白在去游离态铁铝砖红壤和红壤表面吸附曲线为H型,而在其它供试土壤表面的吸附曲线均为L型,可用Langmuir方程拟合;去除络合态铁铝土壤对Bt蛋白吸附量增加,而去除其它形态铁铝氧化物土壤上的吸附量均有不同程度的降低,且游离态铁铝对Bt蛋白吸附的影响最大;Bt蛋白在去除络合态铁铝土壤表面吸附亲和力最大,在去除游离态铁铝的供试土壤表面亲和力最小。【结论】除络合态铁铝外,游离态、非晶形态等铁铝氧化物能促进土壤对Bt蛋白的吸附,这将为Bt蛋白在土壤中环境风险评价提供参考。[Objective] This paper studied the interaction between Bt toxin and several soils in South of China （Latosols, Latosolic red soil, red soil, yellow soil and paddy soil）, and explored the effects of Fe and A1 oxides on the adsorption. [Method] The adsorption characteristics of Bt toxin by different soils were measured by isothermal adsorption method and fitted by Langmuirequation. [Result]The results indicated that except the isotherm curve of Bt toxin adsorbed by Latosols and red soil after removalof free Fe and A1 oxides were H type, the adsorption isotherms of Bt toxin by other tested soils were all L-shaped and fitted to Langmuir equation. The adsorption amount of Bt toxin by soils after removal organic bound Fe and A1 oxides increased comparedto their original soils, while the adsorption amount by soils after removal other species of Fe and A1 oxides decreased, and the greatest impact was observed after the removal of free Fe and A1 oxides. The adsorption affinity （KL） of Bt toxin adsorbed by soils after removal of organic bound Fe and A1 oxides was the highest, and the lowest was shown on soils after removal of free Fe and A1 oxides. [ Conclusion ] Except organic Fe and A1 oxides, Fe and A1 oxides （such as the free, amorphous Fe and A1 oxides, etc.） promoted the adsorption of Bt toxin by soils, which could provide a reference for the assessment of the environmental risk of Bt protein in soil.

关 键 词：BT蛋白 吸附 土壤 铁铝氧化物 

分 类 号：S153[农业科学—土壤学]