| 变化的淹水条件对土壤磷素释放影响 |
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| 引用本文： | 田娟,刘凌,王桂凤,董贵明.变化的淹水条件对土壤磷素释放影响[J].辽宁工程技术大学学报(自然科学版),2008,27(5). |
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| 作者姓名： | 田娟 刘凌 王桂凤 董贵明 |
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| 作者单位： | 河海大学水文水资源与水利工程科学国家重点实验室,江苏,南京,210098 |
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| 摘 要： | 为了研究农业磷引起的水体富营养化机理,选择太湖流域宜兴稻麦轮作土,模拟了变化的淹水深度、水土比、不同酸度上覆淹水等,进行了淹水土壤磷释放研究.实验表明:土壤释磷量随淹水深度成比例增加,同一淹水深度土壤吸附/释放磷量出现周期性变化规律;实验得到一个临界水土比4:1,水土比小于4:1时,淹水中没有Fe2 溶出,且土壤磷释放缓慢,而水土比大于4:1时,磷释放强度增大,上覆淹水中开始出现Fe2 ,且随水土比增大而增加;碱性淹水条件时土壤释磷量大于酸性淹水条件时的释磷鼍,其中上覆水pH9.78时土壤释磷量最大,而pH3.7时土壤总铁和Fe2 释放量最大,但此时释磷量很低,表明淹水中水-土体系Fe2 -Fe2 氧化物氢氧化物胶体一定程度上抑制土壤磷的释放.
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| 关 键 词： | 淹水 土壤磷释放 淹水深度 水土比 pH值 铁氧化物氢氧化物 |
Effect of of variable flooding conditions on soil phosphorus release |
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| TIAN Juan,LIU Ling,WANG Guifeng,DONG Guiming.Effect of of variable flooding conditions on soil phosphorus release[J].Journal of Liaoning Technical University (Natural Science Edition),2008,27(5). |
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| Authors: | TIAN Juan LIU Ling WANG Guifeng DONG Guiming |
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| Institution: | TIAN Juan,LIU Ling,WANG Guifeng,DONG Guiming(State Key Laboratory of Hydrology-Water Resources , Hydraulic Engineering,Hohai University,Nanjing 210098,China) |
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| Abstract: | Phosphorus released from flooded agricultural soils is a concern and it has been a leading cause of eutrophication of lakes and rivers.Phosphorus(P) released from agricultural soils in Taihu Lake watershed was simulated at variable flooding depths,water/soil ratios and pH values of flooding in flooded laboratory microcosms.The results show that P released from flooded soils increased with the increase of flooding depth,and the accumulative P content was highly correlated with flooding depth(R2=0.8451).Moreo... |
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| Keywords: | flooding soil phosphorus release flooding depth water/soil ratio pH values of flooding ferric oxide-hydroxide |
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