摘要
采用恒温培养法研究了几种水稻土的磷吸附和解吸特性及其影响因素。结果表明 ,几种水稻土的磷吸附曲线与Langmuir、Freundlich及Temkin等温吸附方程基本吻合 ,但以Langmuir方程的拟和度最高。土壤最大吸附磷量与物理性粘粒含量呈正相关。几种水稻土的最大吸附磷量依次为 :黄泥田 >淤泥土 >黄泥土 >夹砂土 >砂性轻盐土 ;供试 5种水稻土中 ,以砂性轻盐土的解吸率最大。根据吸附磷的能级大小 ,磷的解吸过程可分为快、中慢 3个阶段进行。
The characteristics of phosphate adsorption and desorption in relation to soil properties were investigated in different paddy soils under the condition of constant temperature. The results indicated that all phosphate adsorption curves could be well described by Langmuir, Freundlich and Temkin equations with best fitness by Langmuir equation. The maximum amounts of phosphate adsorption by paddy soils were positively correlated with physical clay content. The sequence of maximum phosphate adsorption among paddy soils tested was Yellow mud field > Miry soil > Well drained paddy soil > Loamy sand soil > Salinized paddy soil. The maximum desorption rate was found in Salinized paddy soil among the paddy soils tested in this experiment. Based on the bonding energy, the desorption of phosphates adsorbed by soils was divided into 2-3 phases including the rapid, the intermediate and the slow.
出处
《中国农业科学》
CAS
CSCD
北大核心
2002年第11期1369-1374,共6页
Scientia Agricultura Sinica
基金
国家重大基础理论研究资助项目 (G19990 1180 2 )
