A 30-year record of sedimentary phosphorus species in a coastal salt marsh southwest of Hangzhou Bay, China

In this study, two sediment cores (C1 and C2) were collected from the Andong salt marsh southwest of Hangzhou Bay and analysed to determine their different sedimentary phosphorus (P) forms. The changes in the sedimentary P forms over the past 30 years and the implication of these changes on environm...

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Bibliographic Details
Published in:Cogent environmental science 2019, Vol.5 (1), p.1636549
Main Authors: Cheng, Long-Xiu, Loh, Pei Sun, Lou, Zhang-Hua, Jin, Ai-Min, Chen, Xue-Gang, Chen, Chen-Tung Arthur, He, Shuangyan, Yang, Lin, Yuan, Hong-Wei
Format: Article
Language:English
Subjects:
Anoxic conditions
Aquaculture
Bioavailability
bioavailable P
Bridge construction
Cores
Drought
Environmental changes
Environmental risk
Hydroxides
Iron
Organic matter
Oxides
Phosphorus
phosphorus fractions
Reduction
Salt marsh
Salt marshes
sediment core
Sediments
Sodium hydroxide
Typhoons
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Summary:In this study, two sediment cores (C1 and C2) were collected from the Andong salt marsh southwest of Hangzhou Bay and analysed to determine their different sedimentary phosphorus (P) forms. The changes in the sedimentary P forms over the past 30 years and the implication of these changes on environmental risks were determined. The low mean total P (TP) contents along C1 (30.42 mg/kg) and C2 (68.60 mg/kg) indicate no P pollution in the Andong salt marsh. The sedimentary TP and all P forms decreased towards the present due to a reduction in particle size and an overall decrease in nutrient input. The sedimentary P contents were also affected by other factors, such as typhoons, bridge construction and aquaculture activities that facilitated erosion and increased P input, whereas drought caused a reduction in sedimentary P. Organic P (OP) represented more than half of the TP, and NaOH-P (P bound to Fe and Al oxides and hydroxides) represented more than half of the inorganic P (IP), indicating an overall high level of bioavailable P. Thus, the sediments in the Andong salt marsh could be releasing P during organic matter decomposition and under anoxic conditions.
ISSN:2331-1843
2331-1843
2765-8511
DOI:10.1080/23311843.2019.1636549