Variability in removal of dissolved organic carbon in hyporheic sediments

被引：67

作者：

Findlay, S

Sobczak, WV

机构：

[1] Institute of Ecosystem Studies, Millbrook, NY 12545, PO Box AB

来源：

JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY | 1996年 / 15卷 / 01期

关键词：

dissolved organic carbon; hyporheic; sediment; microbes;

D O I：

10.2307/1467431

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Dissolved organic carbon (DOC) is consumed by microbial metabolism as streamwater perfuses through a lateral gravel bar of the East Branch of the Wappinger Creek. The rate of DOC removal was estimated from the decline in DOC and travel time through the bar. Variability in DOC removal together with potential regulatory factors was determined for 14 dates spanning more than a 2-y period. DOC removal was not correlated with temperature, availability of oxygen, or residence time within hyporheic sediments. Hyporheic DOC could be predicted (r(2) = 0.68) from streamwater DOC concentrations, with a surprisingly constant 57% (+/-9% [1 SD]) removal of DOC. This pattern suggests an initial concentration-dependent adsorption of DOC onto surfaces. This mechanism allows for efficient retention of DOC within hyporheic sediments even under conditions (low temperature, high interstitial velocity) that might be expected to minimize biotic consumption of DOC.

引用

页码：35 / 41

页数：7

共 21 条

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