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The concentration thresholds establishment of nitrogen and phosphorus considering the effects of extracellular substrate-to-biomass ratio on cyanobacterial growth kinetics
- Jiang, Mengqi, Zhou, Yanping, Cao, Xin, Ji, Xiyan, Zhang, Weizhen, Huang, Wei, Zhang, Jibiao, Zheng, Zheng
- The Science of the total environment 2019 v.662 pp. 307-312
- Cyanobacteria, biomass, chlorophyll, environmental fate, eutrophication, freshwater ecosystems, freshwater lakes, growth models, nitrogen, nutrients, phosphorus, sustainable development
- Harmful cyanobacterial blooms have caused serious threat to the sustainable development of freshwater ecosystems due to eutrophication, but there is no consensus on nutrients threshold for controlling cyanobacterial bloom. A Monod-based ratio-dependent model was originally developed to investigate the effects of the extracellular substrate-to-biomass (Chlorophyll a) ratio (Sex/X) on the growth kinetics of Cyanobacteria and to determine the concentration thresholds of nitrogen (N) and phosphorus (P) in the form of Sex/X. The results indicated that biomass growth was completely suppressed at Sex/X ≤ 0.21 μg μg−1 for P and Sex/X ≤ 2.82 μg μg−1 for N, which are far lower than the values of most of the eutrophic freshwater lakes. This indicates that in addition to curbing N and P nutrients of eutrophic water, to conduct some biologically mediated changes and to find a suitable environmental fate or a suitable position for excessive N and P nutrients is also of great significance in controlling HABs.