期刊
MARINE POLLUTION BULLETIN
卷 110, 期 1, 页码 93-98出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.06.077
关键词
Microcystis aeruginosa; Nitrogen utilization; Nitrate reductase; Nitrite reductase; Glutamine synthetase
资金
- Major Science and Technology Program for Water Pollution Control and Treatment [2012ZX07102-004]
- National Natural Science Foundation of China [41101080]
Phosphorus is generally considered as the prime limiting nutrient responsible for cyanobacterial blooms. However, recent research is drawing attention to the importance of bioavailable nitrogen (N) in freshwater eutrophication. This study investigated the bioavailability of NO3--N, NO2--N, NH4+-N and Urea-N under different concentrations of 1.2, 3.6 and 6.0 mg L-1 to Microcystis aeruginosa. Overall, Urea-N ranked the first in promoting M. aeruginosa growth, followed by NO3--N and NO2--N. However, the algal growth cultured in NH4+-N was depressed under test N levels. The bioavailability of N to M. aeruginosa was seriously influenced by both N forms and N concentrations (p < 0.01). Total N concentrations in Urea-N treatment decreased the fastest, which were corresponding with the mu values of M. aeruginosa. The high enzymic activities of nitrate reductase, nitrite reductase and glutamine synthetase indicated that the decomposition process for urea is effective, which contributed in N assimilation and utilization in M. aeruginosa cells. (C) 2016 Elsevier Ltd. All rights reserved.
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