期刊
WATER RESEARCH
卷 125, 期 -, 页码 449-457出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.09.008
关键词
Cyanobacteria blooms; Decomposition; Greenhouse gas; Climate warming; Vicious loop
资金
- National Natural Science Foundation of China [41573061]
- Research Projects of Water Environment Comprehensive Management in Taihu Lake of Jiangsu Province [TH2014402]
- Academic Innovation Program of Jiangsu province for College Graduate Students [KYLX16 1295]
Climate warming and eutrophication are regarded as two important contributors to the occurrence of cyanobacteria blooms in aquatic ecosystems. However, the feedback of cyanobacteria blooms to climate warming and eutrophication is not fully clear. In this study, a microcosm system was established to simulate the decomposition processes of cyanobacteria blooms. It was observed that a large amount of nitrogen and phosphorus was released into the overlying water, and the concentrations of nitrogen and phosphorus were increased with the amount of added cyanobacteria bloom biomass addition. Subsequently, these released nutrients became available for primary production and intensified the eutrophic state of freshwater lakes. During the decomposition of cyanobacteria blooms, the microenvironment acquired low DO, low pH, and reductive conditions. Together with abundant organic matter in the water column and sediment, a large amount of CH4 and CO2 produced through organic matter mineralization, in which CH4 was the dominant fraction, occupied 50%-92% in mass of emitted carbon. Furthermore, a certain amount of N2O, probably underestimated, was produced with a strong greenhouse effect, even though its magnitude was small. These observations clarify that the feedbacks among cyanobacteria blooms formation and climate warming as well as the eutrophication of freshwater lakes are not unidirectional, but bidirectional. Given that climate warming enhanced the occurrence of cyanobacteria blooms, it was proposed that there are two vicious loops between cyanobacteria blooms, lake eutrophication and climate warming, which should be considered in the future management of aquatic ecosystems. (C) 2017 Elsevier Ltd. All rights reserved.
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