腐殖酸物质对磷在褐土中迁移的影响

采用室内土柱实验研究了腐殖酸和腐殖酸钠在与磷肥共施时对磷在褐土中迁移的影响。结果表明,与单施磷酸二氢钙相比,共施腐殖酸钠缩短了磷在土壤中的迁移距离,明显降低了施肥点附近微域中的水溶性磷和酸溶性磷含量,磷向土体中的迁移量也显著下降;相比之下,共施腐殖酸则明显增加了磷的迁移距离和迁移量,对肥际微域中不同形态磷的含量均有显著提高作用。因此,腐殖酸促进了磷在褐土中的迁移,适宜与磷肥配合施用,而腐殖酸钠不适合与磷肥共施。

Phosphorus movement in a cinnamon soil as affected by humic substances

The effect of humic substances on the movement of phosphorus(P)in a cinnamon were studied through an incubation experiment using soil column.The results showed that compared to monocalcium phosphate alone,the movement distances of added P were reduced by sodium humate,which also declined the P movement amount and the concentrations of water-extractable P and acid-extractable P in fertilizer microstates.Conversely,humic acid applied with monocalcium phosphate together increased the distance and amount of P movement as well as the concentrations of P in different forms.Therefore,humic acid could promote the movement and transformation of P in cinnamon soil and was recommended to be applied with P fertilizer together.However,sodium humate was not suitable for co-application with P fertilizer.