磷在潮土肥际微域中的迁移和转化

采用室内土柱实验研究了磷在潮土肥际微域中的迁移和形态转化。结果表明,磷在潮土中的移动距离很短,经过7 d和28 d的迁移,磷的迁移距离仅为8～14 mm。施入的磷主要固定在紧靠施肥点2 mm土体范围内,随距施肥点距离的增加,土壤水溶性磷、酸溶性磷和有效磷的含量呈指数曲线迅速降低。磷在施肥后7 d内的迁移量较大,迁移进入土壤的磷绝大部分被吸附固定。施肥量对不同形态磷在肥际微域中的迁移量产生显著影响;但培养时间只明显影响了水溶性磷的迁移量。

Movement and transformation of phosphorus in fertilizer microsites in a fluvo-aquic soil

The movement and transformation of phosphorus (P) in fertilizer microsites in a fluvo-aquic soil were studied by an incubation experiment using soil column. The results showed that the movement distances of added P were very short, only 8 mm-14 mm, after 7 d and 28 d. The most of applied P was moved into soil within 7d, which mainly fixed in the soil of 0-2mm close to fertilizer placement. The concentrations of water-extractable P, acid-extractable P and available P have significant reverse exponential relationships with distance from fertilizer placement in the region of P movement. The amount of P application has significant effects on the movement amounts of different P forms in fertilizer microsites. However, incubation time has significant effect on the movement amount of only water-extractable P.