Behavior of Stable Isotope Ratios of Attached Matter in a Drainage Canal

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
41-02-04.pdf554.76 KB

The behavior of stable isotope ratios of attached matter, which consisted of algae and detritus in a reconstructed drainage canal, was analyzed for one year. Stable carbon isotope ratios in most investigation stations increased during the summer. This was attributed to the growth and photosynthetic activity of attached algae. Only one investigation station showed stable carbon isotope ratios that did not peak in the summer. This station was located in an ecologically conserved section with abundant riparian woods remaining. There was no summer peak due to shading by woods that prevented algae from sufficient photosynthesis. We observed that gray water raised stable nitrogen isotope ratios in water and attached matter of the drainage canal. A topographical peak of nitric acid concentration lagged behind the stable nitrogen isotope ratio. Leaching of chemical fertilizers from paddy fields increased the nitric acid concentration, while decreasing the stable nitrogen isotope ratios at the same time.

作成者 MORI Atsushi


food web

paddy field

stable isotope ratio

公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 133
終了ページ 138
DOI 10.6090/jarq.41.133
権利 Japan International Research Center for Agricultural Sciences
言語 eng