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Influence of Irrigated Paddy Fields on the Fluorescence Properties of Fluvial Dissolved Organic Matter

2011; Wiley; Volume: 40; Issue: 4 Linguagem: Inglês

10.2134/jeq2010.0374

1537-2537

Yoichiro Abe, Nagamitsu Maie, Eikichi Shima,

Microbial Community Ecology and Physiology

Journal of Environmental QualityVolume 40, Issue 4 p. 1266-1272 Surface Water Quality Influence of Irrigated Paddy Fields on the Fluorescence Properties of Fluvial Dissolved Organic Matter Youichiro Abe, Youichiro Abe Graduate School of Veterinary Medicine & Animal Sciences, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanSearch for more papers by this authorNagamitsu Maie, Corresponding Author Nagamitsu Maie [email protected] School of Veterinary Medicine, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanAssigned to Associate Editor Robert CookCorresponding author ([email protected]).Search for more papers by this authorEikichi Shima, Eikichi Shima School of Veterinary Medicine, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanAssigned to Associate Editor Robert CookSearch for more papers by this author Youichiro Abe, Youichiro Abe Graduate School of Veterinary Medicine & Animal Sciences, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanSearch for more papers by this authorNagamitsu Maie, Corresponding Author Nagamitsu Maie [email protected] School of Veterinary Medicine, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanAssigned to Associate Editor Robert CookCorresponding author ([email protected]).Search for more papers by this authorEikichi Shima, Eikichi Shima School of Veterinary Medicine, Kitasato Univ., Towada, Aomori Prefecture, 034-8628 JapanAssigned to Associate Editor Robert CookSearch for more papers by this author First published: 01 July 2011 https://doi.org/10.2134/jeq2010.0374Citations: 7 All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract This study investigated seasonal and geographical variation in the fluorescence properties of dissolved organic matter (DOM) in a river system that includes rice paddy fields in its watershed. The river system covers a northern area of the main island of Japan, and between 6 and 45% the watershed area of the tributaries is paddy fields. Water samples were collected monthly from eight tributaries for 1 yr, and the fluorescence properties of DOM were monitored by combined excitation-emission matrix (EEM) and parallel factor analysis. The EEM was statistically decomposed into six fluorescence components with different environmental dynamics. The relative proportion of these components varied with season and geographic location, the former having a greater effect than the latter. Seasonal variation is largely attributed to changes in the source of DOM associated with irrigated rice cultivation practice. The fluorescence component composition showed a stronger autochthonous signature, which varied over a wider range during off-cropping period (October–April) than cropping period (May–September). During the cropping period, a large amount of allochthonous DOM with relatively similar quality was transported into river water from flooded paddy fields and masked the variability in the quality of DOM among tributaries. Therefore, irrigated rice cropping practices are considered to be one of major factors that influence seasonal and geographical variation of fluvial DOM composition. Citing Literature Volume40, Issue4July 2011Pages 1266-1272 RelatedInformation