Effect of external and internal loading on source-sink phosphorus dynamics of river sediment amended with iron-rich glauconite sand

Xia, Lei; Verbeeck, Mieke; Bergen, Benoit; Smolders, Erik

doi:10.1016/j.jenvman.2023.117396

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…Rivers, as the essential freshwater resources and habitats for aquatic life (He et al 2023, Miranda et al 2021, have become heavily polluted with P due to rapid urbanization and various human activities (Li et al 2021). P enters rivers primarily through external sources such as wastewater discharge, surface runoff, and internal loadings released from sediments (Smolders et al 2017, Xia et al 2023. Rapid urbanization is one of the key causes of in P accumulation in sediments (Saha et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Spatial dynamics of phosphorus in the natural-rural-suburban-urban river sediment continuum (Qinhuai River basin, China): Insights into concentration, fractionation, and environmental risk assessment of phosphorus

Cao,

Zhu,

Gao

et al. 2023

Preprint

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Rapid urbanisation, due to an imbalance in fitness with technological levels, has resulted in the accumulation of phosphorus (P) in river sediments, which is prone to environmental problems such as eutrophication of water bodies. However, little is known about phosphorus's geochemical composition and environmental risks in the natural-rural-suburban-urban river sediment continuum, which is an urgent need. This study investigated the concentration and fractionation of P using sequential P extraction and their influencing factors by introducing the PLS-SEM model (Partial Least Squares Structural Equation Model) along this continuum from the Qinhuai River. The results showed that the sedimentary TP concentrations and P fractions nearly increased dramatically with increasing the urbanization gradient. This spatial heterogenicity of P along a river was attributed mainly to land use patterns and sediment properties (nutrients ＞metals ＞ grain size). In addition, the highest values of TP, BAP (biologically active P) and PPI (P pollution index) were found in urban sediments among four regions, indicating a higher environmental risk of P release, which may increase the risk of eutrophication in overlying water bodies. Collectively, this work improves the understanding of the spatial dynamics of P in the natural-rural-urban river sediment continuum, highlights the need to control P pollution in urban sediments and provides a scientific basis for the future usage and disposal of P in sediments.

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