坡耕地径流沉积物中磷素的富集特征及其生物有效性

通过模拟降雨试验和回归分析,研究了洋河流域坡耕地径流沉积物对磷素的富集特征及其生物有效性,结果表明:洋河流域坡耕地径流沉积物对磷有明显的富集作用,富集系数在1.33～1.43之间;沉积物中磷的形态以无机磷为主,平均占全磷的75.23%,对不同结合态的磷富集程度有明显差异;不同土壤条件下,径流沉积物中各结合态磷的生物有效性不同,Fe-P对沉积物中NaOH-P的贡献率最大.

Enrichment Characteristics and Bioavailability of Phosphorus in Runoff Sediment of Slope Farmland

The enrichment and bioavailability of phosphorus in runoff sediment was studied by a simulated rainfall experiment and regression analysis. The results showed that runoff sediment had an obvious enrichment effect on phosphorus and their ER was1.33-1.43.In runoff sediment, the inorganic phosphorus had priority to other forms of phosphorus and accounted for 75.23% TP, and at the same time runoff sediment had a different enrichment effects on different binded phosphorus. In runoff sediment, the bioavailability of different form phosphorus was different and Fe-P had the greatest contribution to the concentration of bioavailable phosphorus among different forms of phosphorus.