荣成天鹅湖湿地沉积物对磷的吸附特征及影响因子分析  

Phosphorus Adsorption Characteristics of Sediments and Its Influencing Factors in Rongcheng Swan Lake Wetland

作　　者：高丽[1] 史衍玺[2] 孙卫明[1] 唐志红[1] 

机构地区：[1]烟台大学海洋学院,山东烟台264005 [2]青岛农业大学资源与环境学院,山东青岛266109

出　　处：《水土保持学报》2009年第5期162-166,204,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金面上项目(40801084);山东省优秀中青年科学家科研奖励基金项目(2007BS08017)

摘　　要：在荣成天鹅湖湿地的典型区域选取代表性样点,研究表层沉积物对水体中磷的吸附特征,并分析了环境因子、沉积物组成对磷吸附的影响。结果表明,当上覆水中磷浓度低于0.40 mg/L时,沉积物对磷的吸附量很低或呈负吸附状态;在高磷浓度条件下,等温吸附曲线可用改进的Langmuir模型来很好地拟合。本研究条件下湿地沉积物对磷的吸附容量（Qmax）变幅为181.8-1000.0 mg/kg,临界磷平衡浓度（EPC0）变化在0.043-0.479 mg/L之间。沉积物对磷的最大吸附量与其本身的理化性质关系密切,主要影响因素为粘粒含量和粘土矿物种类,氧化铁铝和有机质含量起次要作用。环境因子对磷吸附的影响作用明显,各因子的影响顺序为：扰动〉温度、盐度〉pH。不同区域相比,湿地北部沉积物的吸附能力远高于南部砂质土,且后者的吸附特性更易受到环境因子的影响。Different sampling sites in typical areas from Rongcheng swan lake wetland were selected to study P adsorption characteristics and the influence of environmental factors and sediment composition in present paper.When initial P concentration in water was lower than 0.40 mg/L,P adsorption amount of the sediments was very low or negative.When P concentration was high,P adsorption amount increased with P content in water,and adsorption data were fitted to the revised Langmuir isotherm equation.P adsorption capacity（Qmax） of surface sediments from swan lake wetland varied from 181.8 mg/kg to 1 000.0 mg/kg,and the zero equilibrium P concentration（EPC0） changed at the range of 0.043~0.479 mg/L.P absorption capacities of sediments were closely related to their physiochemical characteristics,whose primary affecting factors were clay concentrations and types of clay minerals,and the secondary factors were the concentrations of organic matter and amorphous Fe/Al oxide.The influence of environmental factors on P adsorption was very obvious,and the effect degree followed the order： disturbancetemperature,salinitypH.Compared among different regions,the adsorption capacities of sediments from the northern wetland were much higher than that of sandy soil from the southern area,and adsorption characteristics of the latter were influenced more easily by environmental factors.

关 键 词：荣成天鹅湖湿地 沉积物 磷吸附 影响因子 

分 类 号：X131.2[环境科学与工程—环境科学]