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Xiao K, Wu J, Li H, et al. Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange. Sci Total Environ. 2018;635:586-597doi: 10.1016/j.scitotenv.2018.04.143.
Xiao, K., Wu, J., Li, H., Hong, Y., Wilson, A. M., Jiao, J. J., & Shananan, M. (2018). Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange. The Science of the total environment, 635586-597. https://doi.org/10.1016/j.scitotenv.2018.04.143
Xiao, Kai, et al. "Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange." The Science of the total environment vol. 635 (2018): 586-597. doi: https://doi.org/10.1016/j.scitotenv.2018.04.143
Xiao K, Wu J, Li H, Hong Y, Wilson AM, Jiao JJ, Shananan M. Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange. Sci Total Environ. 2018 Sep 01;635:586-597. doi: 10.1016/j.scitotenv.2018.04.143. Epub 2018 Apr 24. PMID: 29679831.
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Sci Total Environ. 2018 Sep 01;635:586-597. doi: 10.1016/j.scitotenv.2018.04.143. Epub 2018 Apr 24.

Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange.

The Science of the total environment

Kai Xiao, Jiapeng Wu, Hailong Li, Yiguo Hong, Alicia M Wilson, Jiu Jimmy Jiao, Meghan Shananan

Affiliations

  1. State Key Laboratory of Biogeology and Environmental Geology, School of Water Resources and Environmental Science, China University of Geosciences, Beijing 100083, China.
  2. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
  3. The Key Laboratory of Soil and Groundwater Pollution Control of Shenzhen City, School of Environmental Science and Engineering, South University of Science & Technology of China, Shenzhen 518055, China. Electronic address: [email protected].
  4. School of Environmental Science and Engineering, University of Guangzhou, Guangzhou 510006, China. Electronic address: [email protected].
  5. School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC 29208, United States.
  6. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China.

PMID: 29679831 DOI: 10.1016/j.scitotenv.2018.04.143

Abstract

Coastal mangrove swamps play an important role in nutrient cycling at the land-ocean boundary. However, little is known about the role of periodic seawater-groundwater exchange in the nitrogen cycling processes. Seawater-groundwater exchange rates and inorganic nitrogen concentrations were investigated along a shore-perpendicular intertidal transect in Daya Bay, China. The intertidal transect comprises three hydrologic subzones (tidal creek, mangrove and bare mudflat zones), each with different physicochemical characteristics. Salinity and hydraulic head measurements taken along the transect were used to estimate the exchange rates between seawater and groundwater over a spring-neap tidal cycle. Results showed that the maximum seawater-groundwater exchange occurred within the tidal creek zone, which facilitated high-oxygen seawater infiltration and subsequent nitrification. In contrast, the lowest exchange rate found in the mangrove zone caused over-loading of organic matter and longer groundwater residence times. This created an anoxic environment conducive to nitrogen loss through the anammox and denitrification processes. Potential oxidation rates of ammonia and nitrite were measured by the rapid and high-throughput method and rates of denitrification and anammox were measured by the modified membrane inlet mass spectrometry (MIMS) with isotope pairing, respectively. In the whole transect, denitrification accounted for 90% of the total nitrogen loss, and anammox accounted for the remaining 10%. The average nitrogen removal rate was about 2.07g per day per cubic meter of mangrove sediments.

Copyright © 2018 Elsevier B.V. All rights reserved.

Keywords: Coastal wetlands; Daya Bay; Hydrodynamic circulation; Microbial activity; Nitrogen cycle

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