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In order to explore the spatial distribution of organic phosphorus in the sediments of the rivers entering Lake Hongze and the effects of exogenous inputs on its fraction transformation, we used the Ivanoff method to study the fraction characteristics of or⁃ ganic phosphorus in these sediments. The long⁃term effects of exogenous substances on the fraction changes of organic phosphorus in sediments were also investigated by adding organic matter and iron ions in the laboratory. The results showed that the contents of or⁃ ganic phosphorus in the sediments of the rivers entering Lake Hongze ranged from 34.8 mg / kg to 398.6 mg / kg, accounting for 7.7% to 36.9% of the total phosphorus, and which showed non⁃active organic phosphorus (NOP) > middle⁃active organic phos⁃ phorus (MLOP)> active organic phosphorus (LOP). The average proportion of LOP in the sediments of Suihe River was 19.4% , which was higher than that of other rivers. The average proportion of NOP in Chengzi River was 56.41% , which indicated that the spatial distribution of organic phosphorus was uneven. Overall, the contents of total nitrogen, total phosphorus and organic phos⁃ phorus in sediments of Anhe and Suihe rivers were significantly higher than those of Chengzi and Huaihe rivers, indicating that the former two rivers had a higher pollution level. Redundancy analysis showed that the fractions of organic phosphorus in river sedi⁃ ments were affected by their physicochemical properties, indicating the different influencing factors for different pollution levels of sediment. The addition of exogenous substances can mineralize organic phosphorus in sediments and promote their transformation

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Distribution characteristics of organic phosphorus in the sediments of rivers entering the Lake Hongze and the effects of exogenous substances on their fraction transformation