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Water 2017, 9(7), 545; https://doi.org/10.3390/w9070545

Long Term Trends and Dynamics of Dissolved Organic Carbon (DOC) in a Subtropical Reservoir Basin

1
Center for Sustainable Technology and Environment (CSTEN), Universiti Tenaga Nasional (UNITEN), 43000 Kajang, Selangor, Malaysia
2
Research Center for Environmental Changes, Academia Sinica, Taipei 115, Taiwan
3
Horn Point Laboratory, University of Maryland Center for Environmental Science, 2020 Horns Point Road, Cambridge, MD 21613, USA
4
Institute of Marine Environment and Ecology, National Taiwan Ocean University, Keelung 202, Taiwan
*
Author to whom correspondence should be addressed.
Received: 24 April 2017 / Revised: 30 June 2017 / Accepted: 11 July 2017 / Published: 20 July 2017
(This article belongs to the Special Issue Water Quality Monitoring and Modeling in Lakes)
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Abstract

This study evaluates the long term trends and seasonal patterns of dissolved organic carbon (DOC) concentration in the Fei-Tsui Reservoir basin in Northern Taiwan during the period of 2000 to 2015. The non-parametric seasonal Mann-Kendall test was conducted to identify the trends of DOC and its potential drivers (e.g., temperature, runoff, atmospheric acid deposition and stream water chemistry). The monthly tributaries and water surface DOC concentrations in Fei-Tsui Reservoir had showed strong temporal and seasonal variability. The sulfate (SO4) concentration had exhibited statistically significant decreasing trend over a period of 16 years. The decreasing trends of anions (SO4 and NO3) and base cations (Ca and Mg) as well as increasing trends of pH and acidification index (ACI) in Fei-Tsui Reservoir and streams indicated recovery from acidification. However, there was no significant annual trend in DOC concentration of Fei-Tsui Reservoir and streams. Significant positive correlation was obtained between DOC and trophic state index of Fei-Tsui Reservoir. The results suggested that DOC concentration at the water surface of Fei-Tsui Reservoir was mainly driven by the re-oligotrophication and temperature effects rather than a decrease in atmospheric sulfur deposition. Stream DOC concentration was largely determined by the temporal variability in temperature and rainfall. We concluded that climatic and hydrological factors are the dominant drivers for stream DOC dynamics in the study. View Full-Text
Keywords: atmospheric deposition; dissolved organic carbon; stream; subtropical reservoir; long term trends atmospheric deposition; dissolved organic carbon; stream; subtropical reservoir; long term trends
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Chow, M.F.; Lai, C.-C.; Kuo, H.-Y.; Lin, C.-H.; Chen, T.-Y.; Shiah, F.-K. Long Term Trends and Dynamics of Dissolved Organic Carbon (DOC) in a Subtropical Reservoir Basin. Water 2017, 9, 545.

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