Carbon dioxide and methane emissions from Tanswei River in Northern Taiwan

Developmental Biology

Shang-Shyng Yang³  Liu Ching-Pao²  Cheng-Hsiung Chang²  Li-Yun Liu¹  I-Chu Chen² 

[1] Department of Food Science, Nutrition and Nutraceutical Biotechnology, Shih Chien University, Taipei 10464, Taiwan$$;Department of Food Science, China University of Science and Technology, Taipei 11581, Taiwan$$;Department of Food Science, China University of Science and Technology, Taipei 11581, Taiwan$$Department of Biochemical Science and Technology, National Taiwan University, Taipei 10617, Taiwan$$

关键词: Greenhouse gas emissions;    river;    emission rate;    water quality;    carbon flow;   

DOI  :  10.5094/APR.2015.007

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

To investigate the Green House Gas (GHG) emissions from rivers in Taiwan, environmental conditions, water qualities, and emissions of CO₂ and CH₄ were determined in the Tanswei River of Northern Taiwan, and the correlations between GHG emissions and water quality were also studied. Atmospheric CO₂ concentrations were 347.4-409.7, 342.8-417.3 and 348.5-417.0 ppm in the up–, mid– and down–stream areas, respectively; while atmospheric CH₄ concentrations were 1.59-1.98, 1.74-2.20 and 1.60-2.43 ppm, respectively. Using the headspace method with brown color bottle, CO₂ concentrations were 665–6 917, 1 485–9 369 and 1 443–9 637 ppm, respectively; while CH₄ concentrations fell into the range of 11.8-309.0, 66.0-6 288.2 and 24.1-4 627.5 ppm, respectively. Using the static–chamber method, CO₂ emission rates were -22.3-140.5, -31.7-194.7 and -27.5-226.6 mg m^-2 h^-1, respectively; and CH₄ emission rates were 0.02-5.52, 1.55-144.54 and 0.11-14.10 mg m^-2 h^-1, respectively. CO₂ and CH₄ emission rates had higher values in the mid– and down–stream areas than those in the up–stream area because of the input of industrial, livestock and domestic wastewaters in mid– and down–stream areas. CO₂ emission rates were negative might be because of the measurement times were at noon and some photosynthetic microbes and microalgae in the water were undergoing active photosynthesis. There is a good correlation between the results of headspace and static–chamber methods. CO₂ emissions had very significant positive correlations with Biochemical Oxygen Demand (BOD) and Suspended Organic Matter (SOM); and significant negative correlation with Dissolved Oxygen (DO). CH₄ emission had very significant positive correlations with BOD, SOM and ammonium nitrogen (NH₄-N); significant positive correlation with Suspended Inorganic Matter (SIM); very significant negative correlation with DO; and significant negative correlation with redox potential (Eh). DO, Eh, SOM, SIM and NH₄-N were the major factors that affected CO₂ and CH₄ emissions from water. In the assessment of carbon deposited amount from river to ocean, the annual carbon flows of Tanswei River were estimated with the annual flow amounts and COD, it were 8.9×10³, 1.8×10⁴, 3.9×10⁴, 2.7×10⁴ and 1.2×10⁴ tons in 2003, 2004, 2005, 2006 and 2007, respectively.

【 授权许可】

Unknown   

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