磷肥施用对蔬菜地土壤磷素淋失潜力的影响

通过室外土柱模拟淋洗试验研究表明,随着施磷量的增加,蔬菜地土壤全磷、无机磷含量提高,磷肥施用不仅造成表层土壤磷素含量积累,还会造成底层土壤磷素积累。与单施无机磷肥相比较,有机无机磷肥配施不仅显著提高表层土壤有机磷含量,而且增加底层土壤中有机磷的含量,促进磷的向下迁移。随着施磷量的增加,各土层土壤Olsen-P、CaCl2-P含量均逐渐增大,说明施用磷肥增加了土壤中磷素淋失的潜力。与单施无机磷肥相比较,有机无机磷肥配施造成底层土壤中Olsen-P、CaCl2-P含量的增加,提高了土壤中磷素淋失的潜力。

Effects of Phosphate Fertilizers Application on Potential Leach Ability of Phosphorus

The content of total P and inorganic P increased with the increase of phosphate fertilizer applied.Compared with inorganic phosphate fertilizer,combined application of inorganic and organic increased the content of organic phosphorus at the surface and the bottom of the soil column,thus causing phosphorus leaching.With the increasing application phosphate fertilizer,the content of Olsen-P and CaCl2-P in every layers of soil increased.Compared with inorganic phosphate fertilizer,combined application of inorganic and organic increased Olsen-P and CaCl2-P content in the bottom of soil,showing phosphate fertilizer enhanced the potential leach ability of phosphorus.