Seasonal variation characteristics and release potential of phosphorus in sediments: a case study of the Qiuxi River, a typical diffuse source pollution river in southwestern China
| Autor: | Wen Zhang, Yin Yuepeng, Chen Xuemei, Li Guoxin, Tang Jinyong, Yunan Yan |
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| Rok vydání: | 2020 |
| Předmět: |
Pollution
Stratigraphy media_common.quotation_subject Sewage Organic phosphorus chemistry.chemical_element 010501 environmental sciences 01 natural sciences medicine Total phosphorus 0105 earth and related environmental sciences Earth-Surface Processes media_common business.industry Phosphorus Sediment 04 agricultural and veterinary sciences Seasonality medicine.disease chemistry Aquatic environment Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science business |
| Zdroj: | Journal of Soils and Sediments. 21:575-591 |
| ISSN: | 1614-7480 1439-0108 |
| Popis: | To better control and manage phosphorus (P) in the aquatic environment of the Qiuxi River, a typical river severely influenced by anthropogenic activities in southwest China, the morphological characteristics and the release potential of P in sediments during different water seasons were determined. The overlying water and sediment samples were collected from the Qiuxi River in the normal-water season (NWS), low-water season (LWS), and high-water season (HWS), and physicochemical properties were quantified. Total phosphorus (TP) in sediment and the inorganic phosphorus (Pi) fraction were analyzed using the standard measures technology (SMT) procedure, and organic phosphorus (Po) was further determined to be labile Po (LOP), moderately labile Po (MLOP), or non-labile Po (NLOP). The release potential of P from the sediments was studied by experiments under simulated conditions. The results showed that P pollution in the Qiuxi River was the most serious during the LWS, with mean TP concentrations in the sediment of 854.6 mg kg−1, and the release risk of the sediment P was also highest during this water season. The variation in P concentration was significantly influenced by the discharge of domestic sewage, agricultural diffusion, flow rate, and OM. The concentrations of P fractions varied with water season, but Pi was constantly higher than Po. HCl-extractable Pi (HCl-Pi) accounted for most of the P in the sediments, which was related to its characteristics and the geographical location of the Qiuxi River. The maximum P release (Rmax) was 25.9 mg kg−1 in the LWS and 15.3 mg kg−1 in the HWS, which were positively correlated with the TP (r2 = 0.848, p |
| Databáze: | OpenAIRE |
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