长期施肥条件下栗褐土磷素积累特征

Phosphorus accumulation characteristics in cinnamon soil under long-term fertilization

2010—2012年研究了长期施肥条件下(1988—2012年)栗褐土速效磷、水溶性磷和生物有效磷积累量及三者之间的相关关系,并讨论了水溶性磷与土壤磷饱和度的相关关系。结果表明:长期施用磷肥和有机肥可显著增加栗褐土速效磷、水溶性磷和生物有效磷的含量且以高量有机肥配施化肥处理增加最为显著;P2O5用量为75kg·hm-2、有机肥用量为45000kg·hm-2的处理在2012年时,土壤磷饱和度大于25%,这显著增加了栗褐土磷素流失风险;速效磷、水溶性磷和生物有效磷的之间的相关性均达到极显著水平,其中速效磷与水溶性磷之间呈指数关系;磷饱和度与水溶性磷呈极显著指数关系。

In 2010-2012, this paper studied the accumulated amounts of available phosphorus （P） , water-soluble P, and bioavailable P in a cinnamon soil under long-term （1988-2012） fer- tilization, and analyzed the correlation between the soil water-soluble P and P saturation degree. Long-term application of P fertilizer and organic fertilizer increased the contents of the soil availa- ble P, water-soluble P, and bioavailable P significantly, which was most significant in the treat- ment of applying high amount organic fertilizer combined with chemical P fertilizer. In treatment 45000 kg · hm-2 of organic fertilizer plus 75 kg · hm-2 of P2 05, the soil P saturation degree in 2012 was 〉25% , which enhanced the P loss risk of cinnamon soil remarkably. There existed ex- tremely significant correlations between the soil available P, water-soluble P, and bioavailable P, of which, the first two were of exponential relationship. In addition, there was an extremely sig- nificant exponential relationship between the soil P saturation degree and water-soluble P.