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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.
Through simulated rainfall test and regression analysis, the characteristics of phosphorus enrichment and its bioavailability of runoff sediment from slope farmland in Yanghe River Basin were studied. The results showed that sediment of runoff from slope farmland in Yanghe River Basin had significant enrichment effect on phosphorus , And the enrichment coefficient ranged from 1.33 to 1.43. The forms of phosphorus in sediments were mainly inorganic phosphorus, accounting for 75.23% of the total phosphorus, with significant differences in phosphorus enrichment for different bound species. Under different soil conditions, the runoff The bioavailability of each bound phosphorus in the sediments is different, and the contribution of Fe-P to NaOH-P in the sediments is the largest.