| .不同冻融处理土壤对镉的吸附能力及其影响因子分析[J].农业环境科学学报,2013,32(4):. |
| 不同冻融处理土壤对镉的吸附能力及其影响因子分析 |
| Soil Cd Adsorption Ability Under Different Freeze/Thawing Treatments and Its Influencing Factors |
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| DOI：10.11654/jaes.2013.04.008 |
| 中文关键词: 冻融 土壤 镉 吸附能力 影响因子 通径分析 |
| 英文关键词: freeze/thawing soil Cd adsorption ability influencing factors path analysis |
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| 中文摘要: |
| 为了探讨冻融对土壤镉吸附能力的影响及其机理，通过人工控温、室内分析的实验方法，采用相关分析和通径分析等统计方法，研究了不同水分条件下，冻融处理土壤镉的吸附能力及其与土壤理化性质之间的关系。结果表明，Ｈｅｎｒｙ模型（Ｙ＝ａ＋ｋｄＣ）可以很好地拟合土壤镉的静态吸附过程。在不同含水量处理下，土壤镉的吸附能力均表现为随着冻融次数的增加先增加后降低，土壤镉的吸附能力随着土壤含水量的增加在不同冻融处理时呈现不同的趋势。冻融土壤镉的吸附能力与土壤ｐＨ、阳离子交换量（ＣＥＣ）、永久电荷（ＣＥＣｐ）、可溶性有机质（ＤＯＭ）显著或极显著相关。土壤ｐＨ、ＣＥＣｐ、ＤＯＭ对土壤镉吸附能力的影响是通过直接作用产生的，而ＣＥＣ对土壤镉吸附能力的影响则是通过间接作用产生的。冻融对土壤ｐＨ、ＣＥＣｐ、ＤＯＭ的影响是导致不同冻融处理土壤镉吸附能力差异的主要原因。 |
| 英文摘要: |
| In order to discuss the effect of the freeze/thawing on the Cd adsorption ability of the soil and its mechanism, this paper studied the soil Cd adsorption ability（ｋｄ） under different freeze/thawing treatments and its influencing factors by artificial controlling temperature, indoor experiment and the method of correlation and path analysis. The result showed that the Henry model （Ｙ＝ａ＋ｋｄＣ） could imitate the progress of the cadmium static isothermal adsorption perfectly. The Cd adsorption ability of the soil firstly increased and then decreased with the freeze/thawing time increasing under the different soil water content. The change of the soil Cd adsorption ability with the soil water content was different under the different freeze/thawing time. The correlation of the Cd adsorption ability of the soil and the soil pH, cation exchange capacity（ＣＥＣ）， ｐｅｒｍａｎｅｎｔ ｃｈａｒｇｅ（ＣＥＣｐ）， ｄｉｓｓｏｌｖｅｄ ｏｒｇａｎｉｃ ｍａｔｔｅｒ（ＤＯＭ） ｗｅｒｅ ０．０１ ｏｒ ０．０５ ｓｉｇｎｉｆｉｃａｎｃｅ ｌｅｖｅｌ． Ｔｈｅ ｅffect of the soil pH, CECp, DOM on soil Cd adsorption ability was direct, while that of CEC was indirect. This study clearly demonstrated that the effect of the freeze/thawing on the soil pH, CECp, dissolved organic matter was the key reason for difference of soil Cd adsorption ability under the various freeze/thawing treatments. |
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