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Long-term comparison of dissolved nitrogen species in tropical estuarine and coastal water systems

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Title: Long-term comparison of dissolved nitrogen species in tropical estuarine and coastal water systems
Authors: Lim, Joon Hai Browse this author
Wong, Yi You Browse this author
Lee, Choon Weng Browse this author
Bong, Chui Wei Browse this author
Kudo, Isao Browse this author →KAKEN DB
Keywords: Long-term
Dissolved nitrogen
Total suspended solids
Nutrient loading
Tropical waters
Issue Date: 30-Jun-2019
Publisher: Elsevier
Journal Title: Estuarine coastal and shelf science
Volume: 222
Start Page: 103
End Page: 111
Publisher DOI: 10.1016/j.ecss.2019.04.008
Abstract: Long-term observation of aquatic habitat is invaluable as it reveals trends that are not evident from shorter-term measurements. In this study, we assessed measurements of dissolved nitrogen species over a 12-year period (2004-2015) at Port Klang estuary and Port Dickson coastal water. Total suspended solids (TSS) was also measured, and increased at 6-9 mg L-1 yr(-1). In contrast, total dissolved nitrogen (TDN) did not increase but was higher at Port Klang (8-320 mu M) relative to Port Dickson (2-30 mu M). Chl a concentration was also higher at Port Klang (5.18 +/- 7.79 mu g L-1) than at Port Dickson (2.27 +/- 1.39 mu g L-1). Among the dissolved nitrogen species, we found that ammonium (NH4) was predominant at Port Klang where dissolved inorganic nitrogen (DIN) contributed 71 +/- 3% of TDN. At Port Dickson, dissolved organic nitrogen (DON) predominated, contributing 92 +/- 7% of TDN. When we calculated the nitrogen loading at Port Klang, dissolved nitrogen load increased over time (1.13 +/- 0.29 kg d(-1) for TDN, 1.11 +/- 0.29 kg d(-1) for DIN, and 0.15 +/- 0.06 kg d(-1) for DON). We showed that the nitrogen loading increase at Port Klang was not due to climatic forcing but was most probably due to urbanization occurring upstream that inevitably increased river discharge rates (4.04 +/- 0.12 m(3) s(-1) yr(-1)).
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 勲

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