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Phosphorus chemical speciation and seasonal variations in surface sediments of the Maowei Sea, northern Beibu Gulf
- Yang, Bin, Zhou, Jia-Bin, Lu, Dong-Liang, Dan, Solomon Felix, Zhang, Dong, Lan, Wen-Lu, Kang, Zhen-Jun, Ning, Zhi-Ming, Cui, Dong-Yang
- Marine pollution bulletin 2019 v.141 pp. 61-69
- aquaculture, chemical speciation, inorganic phosphorus, organic matter, particle size, seasonal variation, sediments, summer, water pollution, winter
- This study presents the distribution, seasonal variations and factors influencing phosphorus (P) forms in surface sediments from the Maowei Sea. P forms were measured using the sequential extraction (SEDEX) procedures. Inorganic P (IP) was the predominant chemical form of total P (TP). Fe-bound P (FeP) was the main IP form. Sediment particle sizes, organic matter distribution, terrestrial input and aquaculture activity were responsible for the seasonal variations of different forms of P in sediment. In summer, the average proportions of P fractions in TP followed the order of organic P (OP) > Fe-P > authigenic P (CaP) > detrital P (De-P) > exchangeable P (Ex-P); in winter, the corresponding order was OP > Fe-P > De-P > Ca-P > Ex-P. The potential bio-available P accounted for 71.1 ± 4.9% and 70.6 ± 6.3% of TP in summer and winter, respectively. Sedimentary organic matter mainly came from land-based sources in winter.