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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41026

Title: Typhoon effects on DOC dynamics in a phosphate-limited reservoir
Authors: Fuh-Kwo Shiah
Yu-Fen Tseng
Ting-Chang Hsu
Yi-Lung Chen
Shuh-Ji Kao
Jiunn-Tzong Wu
Ji-Chen Lu
Chao-Chen Lai
Hsiang-Yi Kuo
Chih-Hsien Lin
Yoshimasa Yamamoto
Tian Xiao
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Microbial loop
Heterotrophic bacteria
Date: 2010-07
Issue Date: 2017-02-08T02:29:36Z
Publisher: Aquatic Microbial Ecology
Abstract: Abstract: To explore typhoon effects on dissolved organic carbon (DOC) dynamics, field investigations (tributary and dam site) and laboratory experiments (bioassay and DOC consumption) were conducted in a subtropical reservoir. A tributary survey indicated that after typhoon disruption, upstream areas were the sources of phosphate (P) but not DOC for the dam site located downstream. Bioassay experiments verified P-limitation on bacteria and phytoplankton during summer stratification, and bacteria showed a faster response than algae to added P. Experiments indicated that DOC consumption was determined by the availability of P. The 4 yr typhoon period (June–September) data of the dam site denoted that DOC concentration (27 to 270 μM C) and its rate of change (–13 to 24 μM C d–1) varied more dramatically in the weak (2006 and 2007) than in the strong (2004 and 2005) typhoon years. The negative correlation of DOC with the ratio of bacterial production (BP) to primary production (PP) in the euphotic zone (0 to 10 m) signified the interactive effects of auto- and heterotrophic processes on DOC variation. In the aphotic zone, the variation of DOC could be ascribed to the change of BP, which showed a positive correlation with P concentrations. This study documents that DOC concentration in the studied system varied at multiple time scales. Such variation can be explained by the decoupling between BP and PP, which is believed to be a function of the limiting nutrient’s availability. More importantly, this study suggests that the P supply introduced by strong typhoons might have substantiated a tighter coupling between BP and PP, so that the amplitude of DOC oscillation during the summer period was effectively reduced.
Relation: 60(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41026
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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