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| 胡敏酸对铵钾在粘土矿物上交互作用的影响 | |
| 作者姓名： | ZHANG Wen-Zhao CHEN Xiao-Qin ZHOU Jian-Min LIU Dai-Huan WANG Huo-Yan DU Chang-Wen |
| 作者单位： | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences;Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institue of Subtropical Agriculture, Chinese Academy of Sciences |
| 基金项目： | the National Natural Science Foundation of China，the Special Fund for Agro-Scientific Research in the Public Interest，the Knowledge Innovation Program of the Institute of Soil Science |
| 摘 要： | Interaction of ammonium (NH+4) and potassium (K+) is typical in field soils. However, the effects of organic matter on interaction of NH+4 and K+have not been thoroughly investigated. In this study, we examined the changes in major physicochemical properties of three clay minerals (kaolinite, illite, and montmorillonite) after humic acid (HA) coating and evaluated the influences of these changes on the interaction of NH+4 and K+on clay minerals using batch experiments. After HA coating, the cation exchange capacity (CEC) and specific surface area (SSA) of montmorillonite decreased significantly, while little decrease in CEC and SSA occurred in illite and only a slight increase in CEC was found in kaolinite. Humic acid coating significantly increased cation adsorption and preference for NH+4, and this effect was more obvious on clay minerals with a lower CEC. Results of Fourier transform infrared spectrometry analysis showed that HA coating promoted the formation of H-bonds between the adsorbed NH+4 and the organo-mineral complexes. HA coating increased cation fixation capacity on montmorillonite and kaolinite, but the opposite occurred on illite. In addition, HA coating increased the competitiveness of NH+4 on fixation sites. These results showed that HA coating affected both the nature of clay mineral surfaces and the reactions of NH+4 and K+with clay minerals, which might influence the availability of nutrient cations to plants in field soils amended with organic matter. |
| 关 键 词： | adsorption illite kaolinite montmorillonite organo-mineral complex |
| 收稿时间： | 25 April 2012 |
Influence of humic acid on interaction of ammonium and potassium ions on clay minerals |
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| ZHANG Wen-Zhao,CHEN Xiao-Qin,ZHOU Jian-Min,LIU Dai-Huan,WANG Huo-Yan,DU Chang-Wen.Influence of humic acid on interaction of ammonium and potassium ions on clay minerals[J].Pedosphere,2013,23(4):493-502. | |
| Authors: | ZHANG Wen-Zhao CHEN Xiao-Qin ZHOU Jian-Min LIU Dai-Huan WANG Huo-Yan and DU Chang-Wen |
| Institution: | 1. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institue of Subtropical Agriculture, Chinese Academy of Sciences,Changsha 410125 China 2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China 3. Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institue of Subtropical Agriculture, Chinese Academy of Sciences,Changsha 410125 China |
| Abstract: | Interaction of ammonium (NH4+) and potassium (K+) is typical in field soils. However, the effects of organic matter on interaction of NH4+ and K+ have not been thoroughly investigated. In this study, we examined the changes in major physicochemical properties of three clay minerals (kaolinite, illite, and montmorillonite) after humic acid (HA) coating and evaluated the influences of these changes on the interaction of NH4+ and K+ on clay minerals using batch experiments. After HA coating, the cation exchange capacity (CEC) and specific surface area (SSA) of montmorillonite decreased significantly, while little decrease in CEC and SSA occurred in illite and only a slight increase in CEC was found in kaolinite. Humic acid coating significantly increased cation adsorption and preference for NH4+, and this effect was more obvious on clay minerals with a lower CEC. Results of Fourier transform infrared spectrometry analysis showed that HA coating promoted the formation of H-bonds between the adsorbed NH4+ and the organo-mineral complexes. HA coating increased cation fixation capacity on montmorillonite and kaolinite, but the opposite occurred on illite. In addition, HA coating increased the competitiveness of NH4+ on fixation sites. These results showed that HA coating affected both the nature of clay mineral surfaces and the reactions of NH4+ and K+ with clay minerals, which might influence the availability of nutrient cations to plants in field soils amended with organic matter. |
| Keywords: | adsorption illite kaolinite montmorillonite organo-mineral complex |
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