期刊
MARINE POLLUTION BULLETIN
卷 103, 期 1-2, 页码 63-71出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.12.046
关键词
Coastal waters; Fertilizers; Macroalgae; Sewage; Stable isotopes; Water quality
资金
- National Science Foundation (NSF) [0833211]
Nitrogen (N) enrichment often results in coastal eutrophication, even in remote areas like Hawai'i. Therefore, determining N sources to coastal waters is important for their management This study identified N sources to tide pools in Kapoho, Hawai'i, and determined their relative importance using three stable isotopes (delta N-15,delta O-18, delta B-11). Surface waters and macroalgal tissues were collected along 100-m onshore-offshore transects in areas of high groundwater input for three months at low tide. Water samples from possible N sources were also collected. Mixing model output, along with macroalgal delta N-15 values, indicated that agriculture soil (34%) was the largest anthropogenic N source followed by sewage (27%). These findings suggest that more effective fertilizer application techniques and upgrading sewage treatment systems can minimize N leaching into groundwater. Overall, our multi-stable isotope approach for identifying N sources was successful and may be useful in other coastal waters. (C) 2015 Elsevier Ltd. All rights reserved.
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