【摘要】 对棕壤在去除有机质前后表面电荷及NH4+的吸附解吸特性进行测定,结果表明:(1)去除有机质后,土壤胶体表面正电荷量增加,可变负电荷量减少,永久负电荷量增加。这可能是由于有机质带有大量的可变负电荷,掩蔽了一部分永久负电荷点位,同时中和了一部分土壤表面正电荷所致。(2)土壤对NH4+的吸附量和解吸量的变化与土壤表面电荷数量的变化呈现良好的一致性,有机质可以增加土壤对NH4+的吸附量,并降低其对NH4+的吸附结合能。土壤去除有机质后,其对NH4+的最大吸附量下降,吸附结合能增加,解吸率降低。更多还原

【Abstract】 To study the effect of surface electric charge and NH-4~+ adsorption-desorption on sample soils by removed organic matter before and after.Result showed that :(1) Positive charge and permanent charge increased and variable charge decreased after removed organic matter which had a great deal of variable charge and which covered some permanent charge and neutralixed some positive charge.(2)The change of NH-4~+ adsorption-desorption was found to be the best fit the change of surface charge.Organic matter could increase the quantity of NH-4~+ adsorption-desorption and decrease the energy of NH-4~+combined.更多还原