In the acid paddy soil, sediment, the available phosphorus sources were Fe-P and Al-P. While Al-P was the source when the paddy soil was neutral or basic.
三角洲沉积酸性水稻土的有效磷源为铁磷和铝磷，中性、弱碱性水稻上为铝磷。
Available Fe, on the other hand, had obvious illuviation in meadow black soil. Some other available Fe had the same rule with total Fe.
有效铁在红土母质中分布规律与全铁相反，在草甸黑土中表现出明显的淀积特征，其余各土类中有效铁含量分布与全铁一致。
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