三峡大学学报（自然科学版）2017，Vol.39Issue(6)：104-108,5.DOI:10.13393/j.cnki.issn.1672-948X.2017.06.022
南方酸性红壤区不同土地利用的土壤对镉(Cd)的吸附与解吸
Characteristics of Cd Adsorption-Desorption of Different Land Uses Soils in Acid Red Soil Zone of South China
摘要
Abstract
Five different land use soils(Pinus massoniana forest,tea plantation,paddy soil,orange orchard and strawberry orchard),collected from the acid red soil zone of South China,were analyzed to explore Cd adsorption-desorption characteristics of the soils.The effect of Pb2+ and Cu2+ on Cd2+ adsorption was explored.The research results show that:In terms of Cd adsorption capacity with initial maximum concentrations of Cd added(40 mg · L-1 solutions), a decreasing order was observed as orange orchard soil(851.00 mg · kg-1)＞strawberry orchard soil(808.38 mg · kg 1)＞ paddy soil(778.50 mg · kg-1)＞ Pinus massoniana forest soil (679.38 mg · kg-1)＞ tea plantation soil(650.56 mg · kg-1);however, the desorptive rates order of Cd2+ was tea plantation soil (12.00 ％) ＞ Pinus massoniana forest soil (9.22 ％) ＞ paddy soil (4.61 ％) ＞ strawberry orchard soil(3.77％)＞ orange orchard soil(2.28％).Isothermal curves of Cd adsorption in five soils fit well to Henry equations.The quadratic equation is the best model to describe the desorption-adsorption process of Cd2+.The competitive effect of Pb2+ and Cu2+ on Cd2+ increased with increasing initial concentrations of Pb2+,Cu2+ and Cd2+.The retention factor of Cd in different soils is in the order as orange orchard soil(62.72) ＞ strawberry orchard soil(27.85)＞ paddy soil(19.09)＞ Pinus massoniana forest soil(5.75)＞ tea plantation soil(3.92).The environmental risk of Cd in tea plantation soil is greatest.关键词
镉(Cd)/土壤/吸附/解吸/土地利用Key words
Cadmium(Cd)/soil/sdsorption/desorption/land use分类
资源环境引用本文复制引用
李灵,唐辉,张玉,陈达英,林慧敏,谢淑芳..南方酸性红壤区不同土地利用的土壤对镉(Cd)的吸附与解吸[J].三峡大学学报（自然科学版）,2017,39(6):104-108,5.基金项目
福建省自然基金项目(2017J01650) （2017J01650）
福建省教育厅科技项目(JA14311) （JA14311）
国家级大学生创新训练计划项目(201610397008) （201610397008）
