长期施肥对褐潮土磷素积累、形态转化及其有效性的影响

系统研究了14年定位试验不同施肥处理对褐潮土磷素积累、形态转化及其有效性的影响,结果表明:长期不施磷肥土壤的全磷、速效磷、无机磷总量以及各组分含量较长期休闲处理均明显降低;施用磷肥的处理则相应提高。施肥对Ca2 P含量的影响最大,减少幅度最高为94 7%,几乎耗竭;施磷增加幅度最高可达34倍。其次是Ca8 P和Al P。有机肥配施磷肥更有利于土壤中积累磷素的有效性转化,转变成的Ca2 P为34 5%,明显高于单施磷肥所形成的23 1%,转变成的Ca10 P和O P(闭蓄态P)仅为7%和1 6%,明显低于单施磷肥所形成的11 4%和2 6%。

Effect of long-term fertilization on accumulation, transformation and availability of phosphorus in Fluvo-aquic soil

Effect of long-term fertilization on accumulation, transformation and availabity of phosphorus in Fluvo-aquic soil was studied. Results showed that the contents of total phosphorus, available phosphorus, total inorganic phosphorus and various forms decreased obviously without P fertilizer; with P fertilizer the contents increased. The percentage change of Ca_2-P was the most significant, the next was Ca_8-P and Al-P. Combining NPK with organic manure could promote the availability transformation of phosphorus, Ca_2-P transformation was 34.5%, higher than 23.1% transformed with chemical P fertilizer only; Ca_(10)-P and O-P transformed were respectively 7% and 1.6%, lower obviously than 11.4% and 2.6% with chemical P fertilizer only.