不同化肥对稻田土壤中Ni吸附行为的影响  

Effects of Fertilizers on Ni Adsorption in Paddy Soil

作　　者：郑君健[1] 张学洪[1] 刘杰[1] 赵盈利[1] 

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541004

出　　处：《湖北农业科学》2013年第20期4889-4893,共5页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(41163003);广西自然科学基金项目(2011GXNSFF018003);广西科学研究与技术开发计划项目(桂科攻10124003-3)

摘　　要：以稻田土壤为研究对象,通过等温吸附试验,研究了Ca(NO3)2、NH4NO3、NH4Cl、CO(NH2)2、KH2PO4和KCl 6种化肥对土壤中Ni吸附行为的影响。结果表明,与对照相比,除CO(NH2)2和KH2PO4外,其余4种化肥均使土壤对Ni的吸附率和分配系数不同程度地减小。由Langmuir方程得出的饱和吸附量由高到低依次为KH2PO4、CO(NH2)2、不施肥(CK)、KCl、NH4NO3、NH4Cl、Ca(NO3)2;由De Boer-Zwikker方程推算出土壤中Ni的吸附势由大到小依次为CO(NH2)2、不施肥(CK)、NH4NO3、KCl、KH2PO4、NH4Cl、Ca(NO3)2。表明化肥不仅影响土壤对Ni的吸附量,也影响土壤对Ni的吸附强度。由于不同化肥对土壤中Ni吸附行为的影响不同,因此在含Ni较高的土壤中种植作物时应合理选择化肥,以避免增加土壤中Ni的移动性和生物有效性。Effects of six fertilizers including Ca（NO3）2, NH4NO3, NH4Cl, CO（NH2）2, KH2PO4and KCl, on Ni adsorption in paddy soil were studied using isothermal adsorption experiments. The results showed that Ca（NO3）2, NH4NO3, NH4Cl and KCl decreased the adsorption ratio and distribution coefficient of Ni to different degrees comparing with the control. The decreasing order of saturated adsorption calculated by Langmuir equation was KH2PO4, CO（NH2）2, no fertilizer（CK）, KCl, NH4NO3,NH4Cl, Ca（NO3）2. The decreasing order of Ni adsorption potential calculated from De Boer-Zwikker equation was CO（NH2）2, CK, NH4NO3, KCl, KH2PO4, NH4Cl, Ca（NO3）2. It indicated that fertilizers could influence Ni adsorption and affect Ni adsorption strength. Because fertilizers had different effects on Ni adsorption behavior, fertilizers should be applied reasonably to avoid increasing Ni mobility and bio-availability in soil with high Ni.

关 键 词：化肥 土壤 NI 吸附 

分 类 号：X71[环境科学与工程—环境工程]