Abstract
Phosphorus (P) in wetlands is mainly bound to sediment in various species, which is essential to predict water column P levels. The purpose of this work is to understand the influences of sediment properties and vegetation types on P speciation. Sediments under four vegetation types in the tidal flat and offshore sandbar in Hangzhou Bay of China were collected seasonally. The rank order of P species in sediment based on concentration was exchangeable P (Exch-P) < iron/aluminum-bound P (Fe/Al-P) < organic P (Org-P) < calcium-bound P (Ca-P). Sediment total phosphorus (TP) and Fe/Al-P concentrations were lower in offshore sandbar than those of tidal flat, reflecting effects of anthropogenic contamination in the latter. Sediment particle size distribution strongly affected P speciation, as indicated by a significant correlation between them. Total phosphorus and Org-P concentrations in vegetated sediments were higher than those of bare mudflat. Additionally, there was a significant negative correlation between Ca-P and Org-P, and Fe/Al-P, indicating the presence of vegetation which may result in P speciation by converting Ca-P to soluble and active P and higher Org-P. Overall, sediment particle size distribution is the most fundamental physical property that affects P speciation, and vegetation types are important factors that influence Org-P concentration.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (31000296, 41271314) and the National Major Science and Technology Programs for Water Pollution Control and Treatment (2012ZX07506-006). We wish to thank Xiaohong Zhu and Xiajuan Xu for their skilful assistance in fieldwork.
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Shao, X., Liang, X., Wu, M. et al. Influences of sediment properties and macrophytes on phosphorous speciation in the intertidal marsh. Environ Sci Pollut Res 21, 10432–10441 (2014). https://doi.org/10.1007/s11356-014-2957-x
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DOI: https://doi.org/10.1007/s11356-014-2957-x