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当前位置: 首页 > 文章 > CaSO_4改良苏打碱土的离子吸附交换过程分析与数值模拟 水土保持学报 2008,22 (1) 43-47+51
Position: Home > Articles > Ion Adsorption-Exchange and Numerical Simulation in Process of Reclaiming Sodic Soils With CaSO_4 Journal of Soil and Water Conservation 2008,22 (1) 43-47+51

CaSO_4改良苏打碱土的离子吸附交换过程分析与数值模拟

作  者：
王金满;杨培岭;白中科
单  位：
中国农业大学水利与土木工程学院;中国地质大学土地科学技术学院
关键词：
石膏;苏打碱土;吸附交换;数值模拟
摘  要：
分析CaSO4改良苏打碱土的机理可以为其替代品(脱硫石膏、粉煤灰和磷石膏等)的田间应用提供理论依据。本文通过土柱试验构建了综合考虑离子吸附交换以及土壤水力传导度动态变化的多离子溶质运移方程,并利用UNSATCHEM软件进行了数值模拟。结果表明:CaSO4改良碱化土壤是一个伴随着离子吸附交换反应的复杂过程,同时受到土壤理化特性动态变化的影响,利用UNSATCHEM多离子溶质运移模型能够准确地模拟土壤溶液中Ca2+和Na+的迁移转化、土壤胶体Na+和土壤溶液中Ca2+的吸附交换过程,且其精度较高。同时,CaSO4改良苏打碱土并不是一个短期过程,要想使其彻底改良,一是需要不断淋洗,二是通过分次施加CaSO4,使碱化土壤在长期的一段时间内都保持一定的Ca2+源,以增加CaSO4的持续改良效果。
译  名：
Ion Adsorption-Exchange and Numerical Simulation in Process of Reclaiming Sodic Soils With CaSO_4
作  者：
WANG Jin-man1,3,YANG Pei-ling2,BAI Zhong-ke1,3(1.College of Land Science and Technology,China University of Geosciences,Beijing 100083;2.College of Water Conservancy and Civil Engineering,China Agricultural University,Beijing 100083;3.Key Laboratory of Land Regulation,Ministry of Land and Resources,Beijing 100035)
关键词：
gypsum;sodic soils;adsorption-exchange;numerical simulation
摘  要：
The mechanism of CaSO4 reclaiming sodic soils can provide theoretical basis for the field application of it's substitutes,including Desulphurization gypsum,fly ash,phosphorus gypsum,and so on.A multicomponent solute transport equations in which considering ion adsorption-exchange and dynamic changes of soil hydraulic conductivity was constructed by soil column experiment in this paper,and the UNSATCHEM software was used to simulate and predict the ion movement in the process of reclaiming the sodic soils with CaSO4.Four treatments were designed in the experiment,and the concentration of CaSO4 were 0.5,1,1.5,2 g/L respectively.The results indicated that: the adsorption-exchange reaction between the sodium in soil colloid and calcium in soil solution,were carried through in the process of reclaiming the sodic soils with CaSO4,and the multicomponent solute transport model could simulate the process by rule and line,including the movement of calcium and sodium in soil solution,adsorption-exchange between the sodium in soil colloid and calcium in soil solution;At the same time,it was not a short-term process that sodic soils reclaimed with CaSO4,the model of applying CaSO4 in batches could decrease the accumulation of soil salts and promote the dissolution of CaSO4 and this mode was better than that of applying CaSO4 only once.

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