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| Phosphorus fractions and migration in the sediments of a subsided water area in Panyi coal mine of Huainan |
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Abstract Phosphorus content and fractions in the sediments of one water area from subsided land were analyzed using the modified Pesnner’s extraction method. The migration processes of phosphorus from the submerged agricultural soils were further pursued through the relationship between phosphorus and organic matters (OM), total nitrogen (TN), and Fe oxides of free and amorphous forms. There was an obvious surface layer of lake sediments phase, which covered on the surface of submerged soils. Contents of various phosphorus species were decreasing with the deeper layers of the sediments. TP had an average content of 204.9mg/kg in the bottom layer, which increased to 343.7mg/kg in the surface layers. Inorganic phosphorus (IP) was the main forms of TP, varied at a range of 163.9~257.2mg/kg with a proportion of 73.3%~81.5% to TP. The phosphorus combined with hydrous oxides (NaOH-P) and calcium compounds (HCl-P) ranges were 85.0~100.1mg/kg and 63.6~95.9mg/kg, taking the 28.6%~41.3% and 27.4%~30.9% of TP, respectively. Parts of HCl-P or organic phosphorus (OP) was probably transformed to NaOH-P.
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Received: 10 January 2012
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