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タイトル: | Seasonal and site-specific variability in terrigenous particulate organic carbon concentration in near-shore waters of Lake Biwa, Japan |
著者: | Sakai, Yoichiro Karube, Zin’ichi Takeyama, Tomohiro Kohzu, Ayato Yoshimizu, Chikage Nagata, Toshi Tayasu, Ichiro Okuda, Noboru |
著者名の別形: | 酒井, 陽一郎 |
キーワード: | Allochthonous input sotope mixing model Land use Path analysis Terrigenous POM |
発行日: | Apr-2013 |
出版者: | Springer Japan |
誌名: | Limnology |
巻: | 14 |
号: | 2 |
開始ページ: | 167 |
終了ページ: | 177 |
抄録: | Identifying sources of particulate organic matter (POM) is important for clarifying fundamental mechanisms by which lake food webs are sustained. We determined carbon and nitrogen stable isotope ratios of POM in near-shore waters of Lake Biwa, a large, meso-eutrophic lake in Japan, to estimate relative contributions of terrigenous particulate organic carbon (T-POC), plankton-derived POC (P-POC) and epilithon-derived POC (E-POC) to POC in near-shore waters. Samples were collected during different months (November, February, May and July) at 29 sites located near the mouth of tributary rivers with different discharge and catchment land use. The data revealed that POC mainly consisted of P-POC and T-POC, with relative contributions varying widely over season and among locations. E-POC generally contributed little to the near-shore POC. Path analyses revealed that the concentration of riverine POC whose isotopic signatures were similar to those of rice straws increased with a larger %paddy field area in the catchment of tributary rivers, which subsequently enhanced T-POC inputs to near-shore waters through riverine transportation. Furthermore, our results suggested that T-POC contribution was influenced, with a time lag, by wave-driven turbulence and shore topography, which appear to affect sedimentation and resuspension of T-POC. |
著作権等: | The final publication is available at link.springer.com This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/173518 |
DOI(出版社版): | 10.1007/s10201-012-0394-4 |
出現コレクション: | 学術雑誌掲載論文等 |
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