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This paper focuses on the common dominant green alga in reservoirs algal blooms, Chlorella vulgaris, as the research subject. Using a homemade CO2 concentration stabilizing device, we simulated three CO2 concentration conditions: 400 μmol/mol (current status), 800μmol/mol (predicted for 2100), and 2000μmol/mol (extreme). A 35-day indoor experiment was conducted in a constant temperature light incubator to systematically investigate the dynamic responses of algal growth, photosynthetic activity, and carbon fixation capacity to elevated CO2 concentrations. The results indicated that: In the short-term cultivation (within 24d), high CO2 concentrations (800 and 2000μmol/mol) significantly stimulated algal density growth, reaching up to 972.8×106cells/L. However, in the long-term cultivation (35d), high CO2 concentrations inhibited the proliferation of Chlorella vulgaris and shortened its lifespan. The photosynthetic activity parameters (Fv/Fm, rETR) were not sensitive to changes in CO2 concentration. However, elevated atmospheric CO2 levels inhibited the growth of Chlorella vulgaris, indirectly leading to a reduction in its photosynthetic efficiency. During the proliferation phase (within 24d), the overall carbon fixation of the algal population increased with rising CO2 concentrations, reaching up to 35.919mg C under extreme conditions. However, the carbon fixation efficiency per cell decreased. In the long term (35d) under high CO2 concentrations, the carbon fixation turned negative, transforming the algal population from a "carbon sink" to a "carbon source," thereby exacerbating CO2 release. The study revealed the dual-phase effects of elevated CO2 concentrations on green algae, with short-term promotion of proliferation and long-term inhibition of growth.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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