Seasonal variation characteristics and release potential of phosphorus in sediments: a case study of the Qiuxi River, a
- PDF / 1,019,006 Bytes
- 17 Pages / 595.276 x 790.866 pts Page_size
- 49 Downloads / 226 Views
SEDIMENTS, SEC 2 • PHYSICAL AND BIOGEOCHEMICAL PROCESSES • RESEARCH ARTICLE
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 Xuemei Chen 1,2 & Wen Zhang 1,2
&
Yuepeng Yin 1,2 & Jinyong Tang 1,2 & Guoxin Li 1,2 & Yunan Yan 1,2
Received: 3 June 2020 / Accepted: 11 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose 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. Materials and methods 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. Results and discussion 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. HClextractable 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 < 0.01) and OM (r2 = 0.847, p < 0.01) concentrations in the sediments and explained why the release risk of the sediment P in the LWS was higher than that in the HWS. Conclusions Phosphorus pollution and the P release potential in the sediments of the Qiuxi River were most severe in the LWS, so more effective measures to restrain the release of P should be taken during the LWS. Moreover, OM in sediments should be given more attention owing to its significantly positive correlation with the risk of P release. Keywords Qiuxi River . Southwestern China . Water season . Inorganic phosphorus fractions . Organic phosphorus fractions . Phosphorus release Responsible editor: Patrick Laceby Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11368-020-02805-x) contains supplementary material, which is available to
Data Loading...
