Sediment Biogeochemistry in an East African Mangrove Forest (Gazi Bay, Kenya)

The biogeochemistry of mangrove sediments was investigated in several mangrove forest communities in Gazi Bay, a coastal lagoon in Kenya, Africa. Carbon dioxide fluxes, sediment median grain sizes, sedimentary organic carbon, nitrogen and phosphorus contents and pore-water characteristics (ammonium,...

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Published in:Biogeochemistry 1996-09, Vol.34 (3), p.133-155
Main Authors: Middelburg, Jack J., Nieuwenhuize, Joop, Slim, Frederik J., Ohowa, Boaz
Format: Article
Language:English
Subjects:
Carbon
Carbon dioxide
Chlorides
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Mangrove forests
Marine
Marine ecosystems
Nitrogen
Phosphorus
Quaternary ammonium compounds
Sediments
Soil and rock geochemistry
Sulfates
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container_issue 3
container_start_page 133
container_title Biogeochemistry
container_volume 34
creator Middelburg, Jack J.
Nieuwenhuize, Joop
Slim, Frederik J.
Ohowa, Boaz
description The biogeochemistry of mangrove sediments was investigated in several mangrove forest communities in Gazi Bay, a coastal lagoon in Kenya, Africa. Carbon dioxide fluxes, sediment median grain sizes, sedimentary organic carbon, nitrogen and phosphorus contents and pore-water characteristics (ammonium, nitrate, sulfate and chloride) could be related to forest type. Mangrove sediments have pH values that range from 3.5 to 8.3 due to the limited buffer capacity of these sediments and intense acidifying processes such as aerobic degradation of organic matter, oxidation of reduced components, ammonium uptake by roots and root respiration. The mangrove sediments are nitrogen-rich compared to mangrove litter, as a result of microbial nitrogen retention, uptake and fixation, and import of nitrogen-rich material. It appears that mangrove sediments in Gazi Bay act as a nutrient and carbon sink rather than as a source for adjacent seagrass and reef ecosystems.
doi_str_mv 10.1007/BF00000899
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source JSTOR Archival Journals and Primary Sources Collection; Springer LINK Archives
subjects Carbon
Carbon dioxide
Chlorides
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Mangrove forests
Marine
Marine ecosystems
Nitrogen
Phosphorus
Quaternary ammonium compounds
Sediments
Soil and rock geochemistry
Sulfates
title Sediment Biogeochemistry in an East African Mangrove Forest (Gazi Bay, Kenya)
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