| 不同施肥处理土壤胡敏酸及其级分 与 Fe2+的络合特征 Ⅰ.胡敏酸原样与 Fe2+的络合特征 |
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| 引用本文： | 王旭东,胡田田,张一平.不同施肥处理土壤胡敏酸及其级分 与 Fe2+的络合特征 Ⅰ.胡敏酸原样与 Fe2+的络合特征[J].植物营养与肥料学报,2001,7(1):44-49. |
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| 作者姓名： | 王旭东 胡田田 张一平 |
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| 作者单位： | 1.西北农林科技大学 陕西杨凌712100 |
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| 基金项目： | 国家自然科学基金（39800093）；陕西省自然科学基金（97SMO）资助项目。 |
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| 摘 要： | 采用 17年不同施肥处理 (无肥、化肥、秸秆、厩肥 )土耕层土样 ,在对土壤胡敏酸性质研究的基础上 ,着重研究不同施肥处理土壤胡敏酸与Fe2+的络合特征 ,揭示络合作用与胡敏酸性质以及环境条件的关系。结果表明 ,不同施肥处理土壤胡敏酸与Fe2+的络合能力不同。和无肥处理相比 ,化肥处理胡敏酸的络合能力加强 ,logk值 (络合稳定常数 )增大 ,有机肥处理则使胡敏酸的络合能力下降 ,logk值减小。logk值大小与胡敏酸的羧基、酚羟基以及总酸度有关。pH值、温度、离子强度是影响络合稳定常数大小的环境因素 ,pH值由 4到 7,各处理胡敏酸的logk值增大 ,络合配位数也有增加趋势。温度升高 ,离子强度增大 ,logk值降低。胡敏酸与Fe2+络合反应是一个自发的放热反应 ,络合后整个体系的有序性增强 ,熵值减小。
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| 关 键 词： | 胡敏酸 Fe2+ 络合作用 施肥处理 |
| 文章编号： | 1008-505X（2001）01-0044-06 |
| 修稿时间： | 1999年9月22日 |
Complexation
characteristics of humic acids with Fe2+ and their fractions from soil with
different fertilization. |
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| WANG Xu-dong.Complexation
characteristics of humic acids with Fe2+ and their fractions from soil with
different fertilization.[J].Plant Nutrition and Fertilizer Science,2001,7(1):44-49. |
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| Authors: | WANG Xu-dong |
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| Institution: | 1.Northwest Sci Tech University of Agriculture and Forestry;Yangling Shaanxi 712100;China |
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| Abstract: | In this paper, humic acids from cumulic cinnamon soil withdifferent fertilization treatment (no fertilizer, chemical fertilizer, corn straw and manure) for 17 years were used for studying the complexation characteristic with iron on the basis o f studying the properties of the humic acids. The main results showed that complex ability of humic acid from organic material treatments (corn straw, manure) decreased comparing with that of chemical fertilizer treatment and no fertilizer treatment, which was caused by the low content of total acidity and carboxyl. Complex ability of humic acid may be affected by the factor of pH, temperature and ion strength. Complex stability constant (logk) increased as the pH rose, while decreased with the increase of ion strength and temperature. The complex reaction of humic acid with iron was an exothermic reaction |
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| Keywords: | humic acid Fe2+ complexation fertilizer application |
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