| 氧化还原条件对土壤磷素固定与释放的影响 |
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| 引用本文： | 张桃林,高超,吴蔚东.氧化还原条件对土壤磷素固定与释放的影响[J].土壤学报,2002,39(4):542-549. |
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| 作者姓名： | 张桃林 高超 吴蔚东 |
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| 作者单位： | 1. 中国科学院南京土壤研究所;南京大学城市与资源学系,南京,210008
2. 中国科学院南京土壤研究所 |
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| 基金项目： | 中科院"九五"重在项目(KZ951-AL-301)和国家重点基础研究发展项目(G1999011801)部分研究成果 |
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| 摘 要： | 为探讨水稻土由氧化环境转为还原条件时对土壤磷素固定与释放的影响,选择18种水稻土样品进行室内模拟实验,通过测定不同条件下磷的等温吸附曲线和采用氧化铁试纸测定法进行多次提取以对比淹水前后土壤磷的累计解吸量,发现大部分供试样品的固磷能力在淹水条件下有了显著的提高,全部样品在淹水后磷的释放量都有不同程度的减少。进一步的研究表明淹水条件下土壤对磷的固定与释放的变化主要与淹水后土壤Eh的降低和pH的升高而导致的大量无定形铁的形成有关。
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| 关 键 词： | 氧化还原 等温吸附 解吸 氧化铁试纸 |
| 收稿时间： | 6/5/2000 12:00:00 AM |
| 修稿时间： | 2000年6月5日 |
PHOSPHORUS SORPTION AND RELEASE OF PADDY SOILS:EFFECT OF ALTERNATION OF OXIDIZED AND REDUCED CONDITIONS |
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| Gao Chao,Zhang Taolin and Wu Wei-dong.PHOSPHORUS SORPTION AND RELEASE OF PADDY SOILS:EFFECT OF ALTERNATION OF OXIDIZED AND REDUCED CONDITIONS[J].Acta Pedologica Sinica,2002,39(4):542-549. |
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| Authors: | Gao Chao Zhang Taolin and Wu Wei-dong |
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| Institution: | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008;Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008;Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 |
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| Abstract: | Effect of waterlogged conditions on phosphorus sorption and release of 18 soils with contrasting chemical and physical properties was studied in a laboratory experiment. The soils both in aerobic and anaerobic conditions were analyzed for pH, redox potential (Eh) ,oxalate Fe and the amount of P released measured by means of successively removing soil phosphate using iron oxide-impregnated paper strips. Phosphate sorption isotherms were determined with the standard batch technique for air dried and waterlogged soils. It was shown that after being reduced for 30 days the P sorption capacity, maxim buffering capacity and standard P requirement of most of the soils studied increased while P release from all soils decreased. Our data suggest that the increase in soil oxalate Fe after waterlogging was the main reason responsible for the changes in P sorption and release of the soils studied. |
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| Keywords: | Oxidized and reduced conditions Sorption isotherm Desorption Iron oxide-impreg-nated paper strips |
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