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中文摘要：
对江苏常熟生态站长期施肥条件下的水稻土进行了磷素转化的研究．结果表明，不同施肥处理的土壤全磷（T-P）含量为926～934mgkg^-1，只有对照（CK）比本底值下降0．49％，其它施肥处理的T-P含量都比本底值增加14．24％～28．0％，增幅最大的是半数秸秆＋磷肥（1／2OM＋NPK）处理（28．0％），增幅最小的是NPK（氮磷钾）处理（14．24％）．增幅最大的1／2OM＋NPK处理的T-P含量比CK增加28．0％，年平均增加2．9％；增幅最小的NPK处理的T-P含量比CK增加14．8％，年平均增加1．5％．有机磷（Po）占全磷（T-P）的比值小于无机磷（Pi）占全磷的比值，即：Po／T-P（15％～23％）〈Pi／T-P（85％～77％），与CK相比，Po／T-P值除了NPK处理上升0．47％，其它处理下降了0．82％～6．86％．所有施肥处理的各级无机磷含量（w/mg kg^-1）的大小顺序为：Ca10-P（425～360）〉O-P（143～101）〉Fe-P（103～54）〉A1-P（65～29）〉Ca8-P（45～18）〉Ca2-P（22～3）；1／20M＋NPK处理能增加水稻田土壤中的Al-P和Fe-P含量，而施用NPK肥有利于水稻对Al-P和Fe-P的吸收，因为NPK处理的土壤中Al-P和Fe-P含量只比CK大而比其它处理低；施磷肥会增加水稻土中O-P的含量．
英文摘要：
The effect of long-term fertilization on phosphorus transformation in paddy soil was studied in the Changshu Ecological Station in the Taihu Lake region, Jiangsu. The results showed that the total P （T-P） was 926 -934 mg kg^-1. Only the T-P a- mount of CK was decreased by 0.49% compared to the background value, and the amounts of the others were increased by 14.24% - 28.0%. The largest increment was 28.0% obtained from 1/2OM（ Organic fertilizer） ＋ NPK treatment, which was increased by 2.9% more than that of CK, and the smallest one was 14.8% from NPK treatment, increased by 1.5% compared to CK. The specific value of Po（organic-P）/T-P was smaller than that of Pi（Inorganic-P）/T-P. Po/T-P treatments were decreased by 0.82% -6.86% compared to CK, except that the NPK treatment was increased by 0.47%. The content （w/mg kg^-1） of each fractionations of inorganic phosphorus was in the same order of all fertilization treatments： Ca10-P （425 -360） 〉 O-P （ 143- 101 ） 〉 Fe-P （ 103 - 54） 〉 Al-P （65 - 29） 〉 Cas-P （45 - 18 ） 〉 Ca2-P （22 - 3 ） ; the contents of A1-P and Fe-P were increased when 1/2OM ＋ NPK was applied to paddy field. It was beneficial for rice absorption of Al-P and Fe-P when the NPK was applied to paddy field. The content of O-P was increased when phosphorus fertilizer was applied to paddy field.
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