Speciation and bioavailability of phosphorus in sediments (autumn) of Haizhou Bay
GAO Chun-mei1,2, ZHANG Zhong-fa1, ZHANG Shuo3,4,5
1. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China;
2. Marine Environment Monitoring and Evaluation Center, Shanghai Ocean University, Shanghai 201306, China;
3. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
4. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China;
5. National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China
A modified sequential extraction (SEDEX) method was used for the determination of phosphorus in surface and columnar sediments of Haizhou Bay in October, 2016. The distribution characteristics of various phosphorus forms were studied and their bioavailability speciation and bioavailability of phosphorus in autumn sediments of Haizhou Bay analyzed. The results showed that the total phosphorus varied from 0.340mg/g to 0.445mg/g and inorganic phosphorus varied from 0.271mg/g to 0.350mg/g in surface sediments; the total phosphorus in columnar sediments varied from 0.367mg/g to 0.614mg/g and inorganic phosphorus varied from 0.302mg/g to 0.443mg/g. Inorganic phosphorus was the predominant form of total phosphorus and detrital phosphorus was the main form of inorganic phosphorus in both types of sediments. The concentration of different forms of phosphorous followed the following order:total phosphorus (TP) > inorganic phosphorus (IP) > detrital phosphorus (DAP) > authigenic calcium bound phosphorus (ACa-P) > organic phosphorus (OP) > unstable phosphorus and Fe-bound phosphorus (Fe-P). Through the study of the phosphorus bioavailability, the bioavailable phosphorus (BAP) in surface sediments of this investigated area varied from 0.069mg/g to 0.143mg/g (19.44%~32.66%), with an average of 0.092mg/g (24.17%).The BAP in columnar sediments varied from 0.062mg/g to 0.217mg/g (16.11%~43.54%), and the average was 0.143mg/g, or 30.77% of the total phosphorous, which illustrated that the release risk of phosphorus was less. The correlation between phosphorus content and grain size in sediments showed that Fe-P, OP and ACa-P were positively correlated with fine clay, coarse clay and fine silt, but negatively correlated with coarse sand, fine sand and medium sand in the columnar sediments. DAP showed a significant positive correlation with coarse sand, fine sand and medium sand, and showed a significant negative correlation with fine clay, coarse clay and fine silt. The correlation between BAP and particle size was weak, as indicated by the different particle size composition and plane distribution.
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