Biogeochemical studies on the transport of organic matter along the Otsuchi River watershed,Japan |
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| Institution: | 1. Department of Oceanography, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;2. Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China;3. Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Nagoya, Aichi 464-8601, Japan;4. Unit for Social and Environmental Research, Chiang Mai University, Chiang Mai 50200, Thailand;1. Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, Qc, G1K 9A9, Canada;2. PREMIER TECH, 1 Avenue Premier Campus, Rivière-du-Loup, Qc, G5R 6C1, Canada;1. East Carolina University, Greenville, NC 27858, USA;2. UNC Coastal Studies Institute, Wanchese, NC 27981, USA;1. East Carolina University, Greenville, NC 27858, USA;2. UNC Coastal Studies Institute, Wanchese, NC 27981;1. Department of Chemical and Environmental Engineering, University of the Basque Country, Plaza Ingeniero Torres Quevedo 1, E-48013 Bilbao, Basque Country, Spain;2. Department of Conservation of Natural Resources, NEIKER-Tecnalia, Basque Institute of Agricultural Research and Development, Bizkaia Science and Technology Park, P 812, Berreaga 1, E-48160 Derio, Spain;3. AZTI, Marine Research Division, Herrera Kaia, Portualdea z/g, E-20110 Pasaia, Basque Country, Spain;4. IKERBASQUE, Basque Foundation for Science, Bilbao, Spain;1. Department of Environmental Engineering, College of Engineering, Yeungnam University, Republic of Korea;2. Environmental Research Department, Gyeongsangbuk-do Government Public Institute of Health & Environment, Republic of Korea;3. Hanil Engineering, Yecheon-gun, Gyeongsngbuk-do, Republic of Korea |
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| Abstract: | The distributions and stable isotope ratios of biogenic nitrogen and carbon were investigated in detail along a small watershed in order to establish a biogeochemical framework for assessing the fate of organic matter. Forest ecosystems supply soluble and particulate materials to river systems which are depleted in 15N and 13C. The number of suspended particles and the concentrations of δ15N and δ13C in the river sediments increased along the watershed, indicating a change from river to marine ecosystems. Dramatic variation of δ15N and δ13C were observed in the intertidal sediments, where the progress of denitrification, discharge of domestic sewage, and the accumulation and the decomposition of macroalgae and seagrasses took place.The contribution of land-derived organic matter to estuarine sediments has been estimated from δ13C and from δ15N data. The contribution the landderived organo-silty-clay mineral was 70–100% in the inner bay sediments and 34–42% at the open bay. Possible factors that influence the variation of stable isotope ratios along the watershed are discussed. The relationship between the sizes of particles and isotope ratios clearly demonstrated that organo-silty-clay minerals with diameter smaller than 64 μm were the major source of land-derived refractory organics. |
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