土壤吸附磷特性对磷矿粉供磷的影响  

Influence on Supplying Phosphorus of PRs by the Characteristics of Adsorbed P in Acid Soils

作　　者：饶伟[1] 衡利沙[1] 王代长[1] 

机构地区：[1]河南农业大学资源与环境学院,郑州450002

出　　处：《中国农学通报》2008年第6期266-270,共5页Chinese Agricultural Science Bulletin

基　　金：河南农业大学博士基金"城市废水污染物的清洁技术研究"(30200165);河南农业大学创新基金"土壤重金属形态转化及动力学研究"(CX-06-017)

摘　　要：该文讨论了土壤对磷的吸附/解吸特性与磷矿粉供磷关系。结果表明,土壤磷的吸附数据符合Langmuir和Fruendlich等温吸附方程,磷的最大吸附量(mg/kg)为郴州红壤(1167)>黄棕壤(1111)>棕红壤(651.7);磷的亲和力b值(L/mg)为郴州红壤(0.38)>棕红壤(0.09)>黄棕壤(0.04);磷的最大缓冲容量(L/kg)为郴州红壤(441)>棕红壤(58.4)>黄棕壤(44.2);磷吸附的相对容量Kf值(L/kg)为郴州红壤(434.9)>黄棕壤(226.7)>棕红壤(195.0);比较相关系数和标准误差,Freundlich方程更适合拟合磷的吸附数据。郴州红壤对磷的亲和力较大,吸附磷量也大,但磷的解吸量较小,供磷能力弱,土壤中有效磷含量也低;黄棕壤和棕红壤对磷的亲合力弱,吸附磷量少,但磷的解吸量较大,供磷能力强,土壤中有效磷含量也较高。不同的磷矿粉供磷能力也与2%枸溶性磷含量有良好的线性关系。The relationship of sorbed （desorbed） phosphorus and supplying phosphorus of PRs in soils was discussed. The results showed that the adsorption of phosphorus for tested soils was fitted to Langmuir and Fruendlich isotherm. The maximal amounts of adsorbed P （mg/kg） were the sequence of Chenzhou red siol （1167） 〉 yellowbrown soil （1111） 〉 brown red soil （651.7）. Affinity preference （L/mg） and the maximal buffer capacity （L/kg）were Chenzhou red siol （0.38,441） 〉 brown red soil （0.09,58.4） 〉 yellowbrown soil （0.04,44.2）. Kf values （L/kg） were Chenzhou red siol （434.9） 〉 yellowbrown soil （195.0） 〉 brown red soil （226.7）. By compared to correlation coefficient and standard error,Fruendlich isotherm was more fitted to P adsorption than Langmuir isotherm. The phosphorus affinity and capacity of Chenzhou red soil was bigger than that of yellow brown soil and brown red soil. Whereas the amounts of P desorbed and soil effective P of the former were smaller than that of the latter. The amount of soil effective P was well linear relationship with 2% CA extractable P.

关 键 词：磷矿粉 酸性土壤 吸附与解吸磷 有效磷 

分 类 号：S143.21[农业科学—肥料学]