土壤2011，Vol.43Issue(2)：197-202,6.
围海造田水稻土磷吸附动力学特征及其机理
Mechanism and Characteristics of Phosphorus Adsorption Dynamics of Foreshore Reclamation Paddy Soils
摘要
Abstract
Emissions of nitrogen and phosphorus (P) from coastal farmlands are one of water pollution sources of coastal wetlands and water body. The knowledge on phosphorus chemic al behavior of the foreshore reclamation paddy soils can help evaluate water pollution risks of agricultural production and develop environmental friendly P management measures. The dynamics of phosphate adsorption at three temperatures (15℃, 25℃, 35℃) were investigated in the foreshore reclamation paddy soils originated at three historical periods (Song dynasty, Ming dynasty and Present age) in Cixi, Zbejiang, and thermodynamics parameter and of P adsorption in these soils were also estimated. The results showed that: 1)Kinetic curves of phosphate adsorption could be well described by Langmuir, Freundlich and Temkin equations with the best fitness of Freundlich equation, the sorption parameters of thermodynamics (ΔH0) were 4.39, i 1.40, 15.97 KJ/mol, respectively; P sorption could be dominated by hydrogen bond forces and dipole bond forces referenced to the results of Von Open (1991). 2) The Qm for these paddy soils tested followed the decrease order as bellow: Song dynasty＞Ming dynasty＞Present age, implying that capacity of soil phosphorus adsorption increased with the increase office-planting duration. The Qm was significantly positively correlated with soil organic matter (SOM) (p＜0.01). Therefore, application of organic fertilizer induced to increase of SOM could be conducive to increase soil P adsorption capacity. Qm increased with increasing temperature suggested that phosphate fertilization could be used in summer to reduce the risk of P loss risk from soils.关键词
磷/围海造田/吸附动力学/热力学参数/水稻土Key words
Phosphate/ Foreshore reclamation land/ Adsorption kinetics/ Thermodynamics parameter/ Paddy soils分类
农业科技引用本文复制引用
刘辉,刘忠珍,杨少海,胡正义,赵言文..围海造田水稻土磷吸附动力学特征及其机理[J].土壤,2011,43(2):197-202,6.基金项目
国家自然科学基金重点项目(NSFCNo.40335047)、国家科技支撑计划项目(2006BAJ10B04-2)和广东省自然基金博士启动项目(8451064001001121)资助. （NSFCNo.40335047）
