Budgets of sediment nitrogen and carbon cycling in the shallow water of Knebel Vig, Denmark
Year: 1998
Type: article
Abstract: Sediment was sampled from a shallow coastal area (Knebel Vig.Denmark).The vertical distribution of pigments, Pb-210 and CS-137 indicated that organic matter was muted into the sediment.On an area basis, sediment acid hydrolyzable amino acids accounted for 24 '4, of the particulate organic carbon pool and 53":, of the part~culate organlc nitrogen pool.Similarly, porewater acid hydrolyzable amino acids were an important component of dissolved organic carbon and dissolved organic nitrogen (9 and 27';", respectively).It was inferred that ribonucleic acids potentially were an important component of dissolved organic nitrogen.The estimated efflux of dissolved organic nitrogen from the sediment was higher (3.9 mnlol N m-' d-l) than the estimated efflux of dissolved inorganic nitrogen ( < 2 mm01 N m-' d-l).The high efflux of dissolved organic nitrogen was explained by organic matter hydrolysis close to the sediment surface.The low rates of inorganic nitrogen efflux together wlth a high carbon oxidation rate suggested degradation of organic matter with a low average nitrogen content and possible bacterial nitrogen assimdation.This was further supported by mass balance calculations on nitrogen incorporation into microbial biomass.The calculated average C/N ratio in the organic matter degraded suggested that only part of the sediment acid hydrolyzable amino acids were available for bacterial degradat~on.The efficiency of bacterial carbon incorporation was 0.33 and within the range prev~ously encountered in sediments of Danish waters
Source: Aquatic Microbial Ecology
DOI: 10.3354/ame014069
Authors: BAa Lomstein Jen, AGU Jensen, JW Hansen, JB Andreasen, LS Hansen, J Berntsen, H Kunzendorf
Institution: Aarhus University
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2020041827