离子交换树脂膜测定肥料养分在土壤中的变化  

Assessment of changes of fertilizer nutrient in soil by ion exchange resin membrane method

作　　者：李清荣[1] 王正银[2] 李泽碧[2] 王慧敏[2] 

机构地区：[1]西南大学工程技术学院,重庆400716 [2]西南大学资源环境学院,重庆400716

出　　处：《农业工程学报》2007年第2期71-76,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家863计划(No2001AA246022和2004AA246020)资助项目

摘　　要：在25℃恒温培养条件下，采用离子交换树脂膜（IERM）连续提取法研究了不同肥料（尿素、氯化钾、磷酸二氢钙、缓释复合肥）养分（氮、磷、钾）在土壤中的变化。结果表明，几种肥料养分释放速率各异，缓释复合肥氮、磷养分释放在前期（28d）释放较慢。用该方法提取肥料养分（N、P、K）在土壤中的释放累积量随时间的增加而增大，用Elovich、双常数、一级扩散、抛物线扩散4种动力学方程来描述二者的关系，拟合度都达到了极显著水平（r=0．863^＊＊～0．999^＊＊）。用该法测定肥料在土壤中释放养分的变化特性与用其测定的土壤本身养分的变化特性相似。从而提出了离子交换树脂膜法作为一种评价肥料养分在土壤中的变化特性的较理想方法的可能性。Ion Exchange Resin Membrane （IERM） method was adopted to study the changes of three nutrients（N, P and K） from four fertilizers （urea, potassium chloride, calcium phosphate and slow-release-compound fertilizer） in a continuous soil incubation experiment at 25℃. The results showed that there was significant disparity of nutrient release rate in four fertilizers. The release rate of N and P in slow-release-compound fertilizer was slower than others at the prior stage（28 days）. The release accumulation of nutrients（N, P and K） in soil was enhanced gradually with time and could be quantitatively described by four kinetics equations. Elovich equation, double constants equation, primary diffusion equation and parabola diffusion equation （r = 0. 863^＊＊ - 0. 999^＊＊ ）. The change characteristics of fertilizer nutrients in soil determined by IERM were similar to the corresponding nutrients changes in soil itself by the same method. Therefore IERM may be considered as a better method to evaluate the changes characteristics of fertilizer nutrient in soil.

关 键 词：离子交换树脂膜(IERM) 肥料测定 土壤 

分 类 号：S153.6[农业科学—土壤学]