β-甘油磷酸钠的加入对土壤有机磷组分和速效磷含量的影响

Effect of Added β-Sodium Glycerophosphate on Fractions of Soil Organic Phosphorus and Content of Available Phosphorus

通过室内恒温培育试验,研究了加入外源活性有机磷β-甘油磷酸钠对土壤有机P组分和速效P含量的影响。结果表明,加入到不同类型土壤中的β-甘油磷酸钠,但不仅使土壤活性有机P含量提高,同时也能较迅速矿化为速效P和转化为中活性和中稳性有机P组分,而对稳定性有机P含量的影响较小。但其矿化和形态转化的速率不同,为潮土>黄棕壤>红壤。在黄棕壤中,风干培育条件下有利于外源活性有机P的矿化,淹水培育有利于外源活性有机P向中活性和中稳性有机P组分转化。在潮土和红壤中,风干培育更利于外源活性有机P向中活性和中稳性有机P组分转化。

Fluvo-aquic soil, yellow brown soil and red soil were selected to study the effect of added β-sodium glycerophosphate on the fractions of organic phosphorus and the content of available phosphorus by the incubation experiments. The results showed that with the increase of P concentration added to the soils, the contents of available phosphorus, labile organic phosphorus, moderately labile organic phosphorus and moderately resistant phosphorus of soils increased significantly under different incubation conditions, and there was no significant changes for the content of highly resistant organic phosphorus. In yellow brown soil, added β-sodium glycerophosphate could be transformed more easily from labile organic phosphorus into the fractions of moderately labile organic phosphorus and moderately resistant phosphorus in flooding incubation than in air-drying incubation. But in fluvo-aquic soil and red soil, the flooding incubation condition was in favor of fraction of moderately labile organic phosphorus and moderately resistant phosphorus transformed from added β-sodium glycerophosphate.