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采用室内恒温培养试验法对施入不同量磷(P)肥的石灰性潮土的各种理化特性进行为期180d的模拟研究,结果表明,磷肥的加入使土壤pH值发生了显著的变化,由原来的8.76下降到最小值7.36。高施P量处理F1、F2、F3、F4和F5的Olsen-P浓度分别为2338.5、1576.7、713.6和316.9mgkg-1,0.01molL-1 KCl溶液提取P浓度分别为1226.3、1189.2、880.2和382.9mgkg-1。各处理Olsen-P和0.01molL-1KCl溶液提取P浓度在同一培养时间随施P量的增加而增大,而对同一施P量处理而言,随着培养时间的延长其值呈下降趋势,且随施P量增大下降幅度加大。培养土中有机磷含量随培养时间延长而增加。各处理的无机磷分级体系中,钙磷在无机磷中占绝对优势,Ca2-P、Ca8-P和Al-P含量随P肥加入量的增加而增大,Fe-P含量很小,O-P含量和Ca10-P含量变化不大,随着培养时间的延长,Ca2-P含量减少较多,而Ca8-P含量大量增加,且Ca8-P含量均大于Ca2-P含量。
The results of a 180-day simulation study on the physicochemical properties of calcareous alluvial soils with different amounts of phosphorus (P) fertilizers showed that the pH value of the soil changed significantly from The original 8.76 dropped to a minimum of 7.36. The concentrations of Olsen-P of F1, F2, F3, F4 and F5 were 2338.5, 1576.7, 713.6 and 316.9 mg kg-1, 0.01 mol L-1 KCl respectively. The P concentrations were 1226.3, 1189.2, 880.2 and 382.9 mgkg-1. The concentration of P extracted from the treated Olsen-P and 0.01 mol L-1 KCl solution increased with the increase of the application amount of P at the same culture time, while the value of P decreased with the increase of the incubation time, And with the amount of P increased decline decreased. The content of organic phosphorus in culture soil increased with the prolongation of culture time. In the inorganic phosphorus treatment system, the content of calcium and phosphorus was dominant in inorganic phosphorus. The content of Ca2-P, Ca8-P and Al-P increased with the increase of P fertilizer. The content of Fe- Content and Ca10-P content changed little, with the extension of culture time, Ca2-P content decreased more, while Ca8-P content increased a lot, and Ca8-P content were greater than Ca2-P content.