Diet variation of dissolved organic carbon during large flow events in a lowland river

被引：5

作者：

Westhorpe, Douglas P. ^{[1
,2
]}

Mitrovic, Simon M. ^{[1
,2
]}

Woodward, K. Benjamin ^{[3
]}

机构：

[1] New S Wales Off Water, Une Armidale, NSW 2351, Australia

[2] Univ Technol Sydney, Dept Environm Sci, Ctr Environm Sustainabil, Sydney, NSW 2007, Australia

[3] Griffith Univ, Griffith Sch Environm, Australian Rivers Inst, Nathan, Qld 4111, Australia

来源：

LIMNOLOGICA | 2012年 / 42卷 / 03期

关键词：

Dissolved organic carbon; DOC; Diet Variability; Flows; Lowland rivers; INORGANIC NUTRIENTS; BACTERIAL-GROWTH; MATTER; WATER; SUNLIGHT; EXPORT; TRANSFORMATIONS; CHEMISTRY; NITROGEN; PEATLAND;

D O I：

10.1016/j.limno.2011.12.003

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Diel variation in dissolved organic carbon (DOC) within lotic systems has been reported on numerous occasions. However, to our knowledge there has been no published work on diel DOC variation within lowland rivers during high flow events. We sampled DOC at 4 h intervals from two sites across two distinct flow regimes in the regulated lower Namoi River, Australia. This included a large flood (mean flow 224 m(3) s(-1) and a peak flow of 376 m(3) s(-1)) sampled every 4 h for 10 consecutive days. DOC concentrations were significantly greater at night than during the day (P < 0.05) and the mean DOC concentration was 23.4 mg L-1 at night compared to 18.9 mg L-1 during daylight hours. The magnitude and duration of flow within this lowland river system and the mobilisation of large quantities of allochthonous carbon appeared to play a role in increasing DOC concentration and the diel difference. Crown Copyright (C) 2012 Published by Elsevier GmbH. All rights reserved.

引用

页码：220 / 226

页数：7

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