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- Title
Effects of electron acceptors on soluble reactive phosphorus in the overlying water during algal decomposition.
- Authors
Wang, Jinzhi; Jiang, Xia; Zheng, Binghui; Niu, Yuan; Wang, Kun; Wang, Wenwen; Kardol, Paul
- Abstract
Endogenous phosphorus (P) release from sediments is an important factor to cause eutrophication and, hence, algal bloom in lakes in China. Algal decomposition depletes dissolved oxygen (DO) and causes anaerobic conditions and therefore increases P release from sediments. As sediment P release is dependent on the iron (Fe) cycle, electron acceptors (e.g., NO, SO, and Mn) can be utilized to suppress the reduction of Fe under anaerobic conditions and, as such, have the potential to impair the release of sediment P. Here, we used a laboratory experiment to test the effects of FeCl, MnO, and KNO on soluble reactive phosphorus (SRP) concentration and related chemical variables in the overlying water column during algal decomposition at different algal densities. Results showed that algal decomposition significantly depleted DO and thereby increased sediment Fe-bound P release. Compared with the control, addition of FeCl significantly decreased water SRP concentration through inhibiting sediment P release. Compared with FeCl, addition of MnO has less potential to suppress sediment P release during algal decomposition. Algal decomposition has the potential for NO removal from aquatic ecosystem through denitrification and by that alleviates the suppressing role of NO on sediment P release. Our results indicated that FeCl and MnO could be efficient in reducing sediment P release during algal decomposition, with the strongest effect found for FeCl; large amounts of NO were removed from the aquatic ecosystem through denitrification during algal decomposition. Moreover, the amounts of NO removal increased with increasing algal density.
- Subjects
PHOSPHORUS &; the environment; EUTROPHICATION; ALGAL blooms; DISSOLVED oxygen in water; IRON &; the environment; ELECTROPHILES; NITROGEN oxides &; the environment
- Publication
Environmental Science & Pollution Research, 2015, Vol 22, Issue 24, p19507
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-015-5057-7