摘要
Fe3+还原为Fe2+的过程中会增加磷酸铁的溶解,影响磷的化学行为及有效性。本文采用室内模拟试验研究了三峡库区消落带土壤铁的形态变化及其对有效磷的影响。消落带旱地和水田土壤经淹水和落水处理后,活性铁、水溶性铁增加,其他各形态铁变化较小。旱地土壤在不同的有机质和淹水落水处理下,其活化铁、游离铁、络合铁、水溶性亚铁、和交换性亚铁均为淹水处理高于落水处理,其中活性铁在各处理间呈现出显著性差异,其他则各处理间差异均未达到显著性水平;水田下层活性铁高于上层,且落水处理间呈显著差异。氧化铁及亚铁之间总处于不断的相互转化中,活性铁、络合铁和有机质正相关。旱地土壤中的有效磷各处理间差异显著,水田有效磷淹水处理高于落水处理。
P availability is associated with changes in Fe compounds, particularly poor crystalline Fe （hydra） oxides. The effects of different water and OM treatments on iron transformation and P availability in soil from a drawdown area of the Three Gorges reservoirs was studied with soil column experiments. The results showed that amorphous iron and water-soluble iron in soil from the drawdown area of the Three Gorges reservoir increased by different water and OM treatments. Amorphous oxides were affected by water and OM in upland field and they had higher value in the treatments of FK and FKM than those in CK and CKM, but amorphous iron oxides in a paddy field decreased from upper layer to lower layer. Total free iron oxide, Water-soluble and exchangeable iron varied differently and had higher value in flooded soil than in unflooded soil. Available P had higher value in flooded soil than unflooded soil.
出处
《土壤通报》
CAS
CSCD
北大核心
2008年第1期66-70,共5页
Chinese Journal of Soil Science
基金
教育部科学技术重点资助项目(03142)
西南大学博士基金资助项目(2003-18)
教育部博士点基金20050635001
西南大学自然地理学科开放基金250-411108
关键词
铁的形态
有效磷
消落带
Formation of Iron
Available P
Drawdown area
