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Interdependence between phosphorus forms in sediments and iron in interstitial waters in the Gulf of Gdańsk

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Matuszewska K. , Białkowska I. , Bolałek J.

Oceanological and Hydrobiological Studies

2003

tom Vol. 32, No. 1

5-14

The content of various phosphorus forms in sediments and the content of iron in interstitial waters were measured in sediment samples collected in the Gulf of Gdańsk in March 2001. The studies showed that the greatest amounts of the total phosphorus and total dissolved iron were present in the uppermost sediment layer, and their respective concentrations ranged from 203.99 žmol g-1 d.w. to 1894.02 μmol g-1 d.w., and from 0.02 μmol dm-3 to 4.68 μmol dm-3. The contents of these parameters were directly connected with the type of sediment – the greatest concentrations were measured in fine sediments. The analysis of multiple correlation coefficients demonstrated that in over 90% of cases the concentration of phosphorus bound with iron depended on: the sediment type and its humidity, the content of organic matter, and the concentration of the total iron dissolved in the interstitial waters.

Phosphorus forms in the sediment of seagrass meadows affected mainly by fungi rather than bacteria : a preliminary study based on 31P-NMR and high-throughput sequencing

88%

Zhao M. , Wang H. , Wang S. , Han Q. , Shi Y.

Oceanological and Hydrobiological Studies

2020

tom Vol. 49, No. 4

408--420

Microorganisms play an important role in the circulation of phosphorus (P) in the sediment of coastal wetland ecosystems. In this study, solution 31P nuclear magnetic resonance (NMR) was used to determine different forms of P in the sediments of four different seagrass meadows and a bare tidal flat, while high-throughput 16S and ITS rRNA gene sequencing was used to determine the microbial community composition. The solution 31P-NMR spectra revealed six forms of the P compounds detected by the NaOH-EDTA extraction of sediments, where Ortho-P was the most dominant P compound, followed by Mono-P. The Po compounds were more varied in the seagrass meadow sediments and more abundant compared to the bare tidal flat. Bacterial communities in the sediments collected from E. acoroides and fungal communities in the bare tidal flat were relatively different from those at the other sites. The relative abundance of P-cycling-related fungi belonging to the phylum Ascomycota was 26.20% and was much higher than that of bacteria (only 0.29%) belonging to the class Bacilli. Mono-P was the major factor determining the distribution of P-cycling-related fungi and negatively correlated with the relative abundance of Aspergillus and Trichoderma. We believe that fungi can affect P forms in the sediment of seagrass meadows more than bacteria.