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利用盆栽试验研究了几种人工合成磷源在轻粘质潮土根际和本体土壤中的形态转化及配施不同形态氮肥对其形态转化的影响 ,结果表明 ,作物耗竭引起根际所有形态无机磷不同程度的下降。施入土壤的DCP(CaHPO4 ·2H2 O)、OCP(Ca8(PO4 ) 6 )、Al P(AlPO4 ·nH2 O)等大部分转化为其它形态无机磷 ,而Fe P(FePO4 ·nH2 O)和FA(Ca10 (PO4 ) 6 F2 )大部分以自身形态存在 ,尤其是FA很少向其它形态转化 ,根际条件促进了它们向其它无机磷形态的转化。Al P和FA等的形态转化明显受氮肥形态的影响 ,Al P配施NO- 3 N下 ,绝大部分转化为磷灰石 ,NH+4 N配施下促进了FA向其它形态的转化 ,在所有的磷源处理中 ,根际和本体磷酸铁都有显著地增加 ,NH+4 N和CO(NH2 ) 2 处理下存在磷酸铁的根际累积 ;其次是磷酸二钙和磷酸铝也有明显地增加 ,二者存在根际的亏缺。不同磷源的形态转化规律与其有效性大小相一致。
The pot experiment was conducted to study the morphological transformation of several synthetic phosphorus sources in the rhizosphere and bulk soil of lightly-viscous soil and the effects of different forms of nitrogen fertilizers on the morphological transformation. The results showed that all the inorganic forms of rhizosphere Phosphorus decreased to varying degrees. Most of the DCP (CaHPO4.2H2O), OCP (Ca8 (PO4) 6) and AlP (AlPO4 · nH2O) applied to the soil were converted to other forms of inorganic phosphorus while FeP (FePO4nH2O) and FA (Ca10 (PO4) 6 F2) mostly existed in their own form. In particular, FA was rarely converted to other forms, and rhizosphere conditions promoted their transformation to other forms of inorganic phosphorus. The morphological transformation of Al P and FA was obviously influenced by the form of N fertilizers. Most of Al P and NO 3 N were converted to apatite. The combination of NH 4 N and N promoted the transformation of FA to other forms, In all treatments of phosphorus source, the rhizosphere and bulk ferric phosphate all increased significantly, and the rhizosphere accumulation of ferric phosphate was observed under NH + 4 N and CO (NH 2) 2 treatment, followed by that of dicalcium phosphate and aluminum phosphate Increase, both the existence of rhizosphere deficit. The morphological transformation of different phosphorus sources is consistent with their validity.