Towards a classification of organic enrichment in marine sediments based on biogeochemical indicators

被引：213

作者：

Hargrave, B. T. ^{[1
]}

Holmer, M.

Newcombe, C. P.

机构：

[1] Fisheries & Oceans Canada, Bedford Inst Oceanog, Ecosyst Res Div, Dartmouth, NS B2Y 4A2, Canada

来源：

MARINE POLLUTION BULLETIN | 2008年 / 56卷 / 05期

关键词：

sulfate reduction; sulfides; toxicity; macrofauna; biodiversity;

D O I：

10.1016/j.marpolbul.2008.02.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A nomogram is developed to show that pH, redox potentials (Eh(NHE)) and measures of dissolved sulfides (H2S + HS- + S2-)(total free S2-) can be used to classify organic enrichment impacts in marine sediments. The biogeochemical cycle of sulfur in marine sediments is described to show that changes in macrobenthic infauna community structure associated with high levels of organic matter supply result from stress due to oxygen deficiency (hypoxia and anoxia) and toxic effects of S2-. The changes reflect enhancement of microbial sulfate reduction under conditions of high organic matter sedimentation and the progressive formation of hypoxic-anoxic conditions measured by decreased EhNHE and increased concentrations of S2-. The nomogram provides a basis for classification of the oxic status of marine sediments based on changes in inter-related biological and biogeochemical variables along an organic enrichment gradient. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：810 / 824

页数：15

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