Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5757268 | Marine Pollution Bulletin | 2017 | 10 Pages |
Abstract
In the present study, we investigated the influence of phenanthrene (PHE), a three-ring polycyclic aromatic hydrocarbon (PAH) compound, on nitrate (NO3â) reduction processes in mangrove sediments using microcosms. After 10 days, nitrate/nitrite reductase activity and abundance of narG and nirS significantly decreased in the bulk sediment at both 10/50 mg PHE kgâ 1 contamination groups. In the rhizosphere, abundance of narG, nirS and nirK markedly declined at PHE treated sediments, while the drop in reductase activity at 10 mg kgâ 1 PHE treatment was insignificant. After 50 days, apart from 10 mg Phe kgâ 1 treated bulk sediment, abundance of denitrifiers and reductase activity in all PHE spiked sediment samples significantly dropped. Therefore, the influence of PAHs on NO3â reduction capability in mangrove sediments is dependent on spiked concentration, temporal scale of exposure and interaction with roots. Generally, PAHs play an inhibitor role, slowing NO3â turnover rates, which warrant attention from coastal managers.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Oceanography
Authors
Shan Jiang, Yan Su, Haoliang Lu, Hui Jia, Jingchun Liu, Chongling Yan,