Phosphorus release from cyanobacterial blooms during their decline period in eutrophic Dianchi Lake, China

Environmental Science and Pollution Research International
Shenghua ZhangYin Lu

Abstract

The phosphorus (P) release from bloom-cyanobacterium during its decline period is one of the most important parts involved in lake P-biogeochemical cycle, which is an important nutrient self-regulating process to sustain eutrophic status in lakes. An in situ experiment was set up to study the phosphorus release mechanisms of cyanobacterial blooms in Dianchi Lake during its decline period. In the enclosure, the cyanobacteria were dying out gradually and this process further affected the water quality parameters and lead to P release from bloom-cyanobacteria. The pH and electric conductivity (EC) increased substantially, while the redox potential (ORP) decreased during the whole experimental period. Among all the released P forms, the orthophosphate (ortho-P) was the main released P form and accounted for 96.7 and 67.8% of the total phosphorus (TP) increment in the water and the TP reduction in algae respectively. According to the TP in sediment and lost P of overlying water column, it could be concluded that the ortho-P released from algae was absorbed by sediment as well. The release of TP, organic P (OP), and ortho-P from bloom-cyanobacteria all followed the first-order kinetics, and the release rate of ortho-P was much higher...Continue Reading

References

Dec 17, 2002·The Journal of General and Applied Microbiology·Shigeto OtsukaMakoto M. Watanabe
Mar 11, 2005·Environmental Science & Technology·Joakim AhlgrenEmil Rydin
Nov 18, 2005·Ecotoxicology and Environmental Safety·Yongmei LiuYongding Liu
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Apr 14, 2016·Environmental Science and Pollution Research International·Zhihao WuLixin Jiao
May 9, 2016·Environmental Science and Pollution Research International·Junzhuo LiuYonghong Wu

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