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对定位施肥的棕壤土壤无机磷形态分级的研究结果表明 :长期无磷素投入的N、CK区 ,Ca10 -P含量下降了约 2 5 % ,而O -P下降了 11.6 %～ 30 % ,施肥后 ,土壤中无机磷的增量主要是形成Fe -P和Al-P ,其次对有机肥中的磷是形成Ca8-P和Ca2 -P。连续 14年的高量有机肥和磷肥配施 ,使土壤各形态无机磷占全磷比例的先后顺序发生了很大的变化 ,其比例由大到小依次为 :Fe -P(2 2 .76 % )、O -P(14.6 % )、Al -P(12 .49% )、Ca10 -P(9.13 % )、Ca8-P(7.99% )、Ca2 -P(6 .5 8% ) ,而原始土壤中则是 :O -P(2 4.2 1% ) ,Ca10 -P、Fe-P(17.87% ,16 .6 8% ) ,Al-P、Ca8-P(1.71% ,1.5 7% ) ,Ca2 -P(0 .2 3 % )。
The result of inorganic phosphorus classification on brown soil with different fertilization positions showed that the contents of N, CK and Ca10-P decreased by about 25% and O-P decreased by 11.6% -30% After fertilization, the increment of inorganic phosphorus in the soil mainly formed Fe-P and Al-P, followed by the formation of Ca8-P and Ca2-P in the organic fertilizer. For 14 consecutive years, a large amount of organic phosphorus and phosphate fertilizer had been applied to greatly change the sequence of inorganic phosphorus in total phosphorus in soil. The order of decreasing ratio of inorganic phosphorus to total phosphorus in soil was Fe-P (2 2 .76 (14.6%), Al-P (12.49%), Ca10-P (9.13%), Ca8- P (7.99%) and Ca2-P In the soil, the contents of O-P (4.211%), Ca10-P, Fe-P (17.87%, 16.68%), Al-P, Ca8-P -P (0.23%).