期刊
CHEMOSPHERE
卷 307, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.135777
关键词
Cyanobacteria; Sediment; Phosphorus release; Bacterial community
资金
- National Natural Science Founda-tion
- Shanghai Sailing Program
- Major Science and Technology Program for Water Pollution Control and Treatment
- Fundamental Research Funds for the Central Universities
- [52000024]
- [20YF1400300]
- [2017ZX07206]
This study investigated the release of phosphorus from sediments during cyanobacteria growth and found a correlation between microbial community structure and phosphorus release.
The release of endogenous phosphorus from lacustrine sediment is a key element of freshwater eutrophication. The microbes in sediments may affect phosphorus migration and transformation during the growth of cyano-bacteria, which may lead to the release of phosphorus from sediments and contribute to water eutrophication. To study phosphorus sorption and the microbial community structure in the overlying water and the vertical depth of sediments, samples in Meiliang Bay were collected during the dormancy and resuscitation phases of cyano-bacteria. The results showed that there were high total phosphorus (TP) concentrations in the overlying water and sediment, with maximum values reached 0.24 mg L-1 and 1059 mg kg-1, respectively. Fitting by modified Langmuir model indicated that the partitioning coefficients (KP) was, from greatest to least: bottom sediment (maximum of 0.923 L g-1) > middle sediment (0.571 L g-1) > surface sediment (0.262 L g-1). During the cyanobacteria resuscitation stage, the relative abundance of Proteobacteria (18.37%-33.56%), Chloroflexi (9.57%-17.76%), Cyanobacteria (0.38%-2.62%), and the Nitrospirota phylum Thermodesulfovibrionia (4.61%- 10.14%) were higher than the dormant period of cyanobacteria, and bacteria with phosphorus-solubilizing (27.27%-52.01%) accounted for the majority. The redundancy analysis (RDA) found that the structure of the microbial communities in sediments was significant correlation with organic phosphorus (OP) (P = 0.002) during recruitment period of cyanobacteria, which would accelerate the conversion of OP into soluble inorganic phosphorus and then gets released from sediment to water. The most predominant phylum among phosphorus-solubilizing bacteria (PSB) is Proteobacteria, followed by Actinobacteriota, which were positively correlated with equilibrium phosphorus concentration (EPC0) (P < 0.05) during the cyanobacterial resuscitation phase. The sediments from the cyanobacteria resuscitation phase had phosphorus release risk and highlighted the significant role of the bacterial community.
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