期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 192, 期 -, 页码 117-127出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.05.007
关键词
Oyster aquaculture; Sediment biogeochemistry; Nitrogen cycling; Nitrate reduction; Dissimilatory nitrate reduction to ammonium
资金
- Griffith University
- ARC Linkage grant [LP150100519]
- Australian Research Council [LP150100519] Funding Source: Australian Research Council
In this study we quantified nitrate (NO3-) reduction (denitrification, anammox and DNRA) and N2O production in sediments and epibiont communities associated with Sydney Rock Oyster (Saccostrea glomerata) farming. In sediments beneath an active suspended oyster farm, DNRA accounted for 98% of NO3- reduction with rates of up to 169 +/- 45 mu mol N m(-2) h(-1). Much of this DNRA was fuelled by NOS derived from nitrification. Reference sediments had significantly lower DNRA rates of 83.8 +/- 28.2 mu mol N m(-2) h(-1), however this constituted 96% of the sites total NO3- reduction. Fatty acid analysis showed that sediment organic matter was more labile in the oyster impacted sediments, facilitating subtle shifts in sediment oxygen demand which increased the Fe2+ availability with respect to the reference sediments. The difference in DNRA rate between the sites was attributed to autotrophic oxidation of soluble Fe2+ in sediments underlying the oyster cultures. DNRA was absent in the oyster shell epibiont communities and rates of anammox and denitrification were lower than in the sediments. Production of NH4+ from the oysters and their associated epibionts was larger than DNRA and reached a rate of 206.2 mu mol N m(-2) h(-1). Nitrous oxide production rates were generally low compared to other aquaculture systems and the net flux of N20 for the combined oyster cultivation system (i.e. sediments plus epibionts) was negative, i.e. there was N20 consumption in the sediments beneath the oysters. Overall, subtropical suspended oyster farming systems favour inorganic N retention over N loss. (C) 2017 Elsevier Ltd. All rights reserved.
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