Spatial and seasonal variations of sulphate, dissolved organic carbon, and nutrients in deep pore waters of intertidal flat sediments

被引：71

作者：

Beck, Melanie ^{[1
]}

Dellwig, Olaf ^{[1
]}

Liebezeit, Gerd ^{[2
]}

Schnetger, Bernhard ^{[1
]}

Brumsack, Hans-Juergen ^{[1
]}

机构：

[1] Carl VonOssietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, D-26111 Oldenburg, Germany

[2] ICBM Terramare, D-26382 Wilhelmshaven, Germany

来源：

ESTUARINE COASTAL AND SHELF SCIENCE | 2008年 / 79卷 / 02期

关键词：

intertidal flat; pore water; spatial and seasonal variation; advection; sulphate; DOC; nutrients;

D O I：

10.1016/j.ecss.2008.04.007

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

Spatial and seasonal variations of sulphate, dissolved organic carbon (DOC), nutrients and metabolic products were determined down to 5 m sediment depth in pore waters of intertidal flats located in NW Germany. The impact of sediment permeability, pore water flow, and organic matter supply on deep pore water biogeochemistry was evaluated. Low sediment permeability leads to an enrichment of remineralisation products in pore waters of clay-rich sediments. in permeable sandy sediments pore water biogeochemistry differs depending on whether tidal flat margins or central parts of the tidal flat are studied. Pore water flow in tidal flat margins increases organic matter input. Substrate availability and enhanced temperatures in summer stimulate sulphate reducers down to 3.5 m sediment depth. Sulphate, DOC, and nutrient concentrations exhibit seasonal variations in deep permeable sediments of the tidal flat margin. In contrast, seasonal variations are small in deep pore waters of central parts of the sand flat. This study shows for the first time that seasonal variations in pore water chemistry are not limited to surface sediments, but may be observed down to some metres depth in permeable tidal flat margin sediments. In such systems more organic matter seems to be remineralised than deduced from surface sediment studies. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：307 / 316

页数：10

共 41 条

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