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- Title
极小曲丝藻生长与光合活性对硅浓度的响应.
- Authors
熊珍珍; 毕永红
- Abstract
In order to explore the relationship between diatom proliferation and silicon concentration in the main channel of the Middle Route of the South-to-North Water Diversion Project, Achnanthidium minutissimum, a dominant species throughout the year, was selected as the object of this study. The effects of different initial silicon concentrations (0, 2, 4, 6 and 8 mg·L−1 ) on the growth and photosynthetic physiological characteristics of Achnanthidium minutissimum were investigated. The results showed that different silicon concentrations had a significant effect on the specific growth rate of Achnanthidium minutissimum (P<0.05). When the silicon concentration was 0 mg·L−1, the concentration of chlorophyll a and carotenoid, and the maximum photochemical efficiency of the photosynthetic system Ⅱ (Fv/Fm) were all significantly decreased compared to the groups which added silicon (P<0.05), and the chlorophyll fluorescence induction curve (OJIP) characteristics were not obvious, and no photosynthetic oxygen evolution could be detected. With the increase of silicon concentrations (2→8 mg·L−1 ), the cell density, the specific growth rate and the maximum standing biomass all increased significantly. In silicon concentration of 2 mg·L−1 group, the concentration of chlorophyll a and carotenoid per unit cell were significantly lower than the other three silicon concentration groups (P<0.05). There was no significant difference in the contents of chlorophyll a and carotenoid per unit cell, Fv/Fm or the photosynthetic oxygen evolution rate among silicon concentration groups of 4 mg·L−1, 6 mg·L−1 and 8 mg·L−1 . It was concluded that the silicon was the limiting factor for the rapid proliferation of diatom. The concentration of silicon in the middle channel of the South-to-North Water Diversion Project was relatively high (about 5 mg·L−1 ), meeting the needs of diatom proliferation, which was an important factor leading to the rapid proliferation and dominance of diatom.
- Subjects
PHOTOSYNTHETIC oxygen evolution; CHLOROPHYLL spectra; WATER diversion; UNIT cell; CHLOROPHYLL; DIATOMS; SILICON; OXYGEN
- Publication
Ecological Science, 2023, Vol 42, Issue 3, p30
- ISSN
1008-8873
- Publication type
Article
- DOI
10.14108/j.cnki.1008-8873.2023.03.004