Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Whole‐lake mineralization of allochthonous and autochthonous organic carbon in a large humic lake (örträsket, N. Sweden)

Whole‐lake mineralization of allochthonous and autochthonous organic carbon in a large humic lake... Organic carbon mineralization was studied in a large humic lake (Lake Ortrasket) in northern Sweden during a well‐defined summer stratification period following high water flow during snowmelt. Several independent methods including plankton counts, measurements of bacterioplankton and phytoplankton production, stable isotope monitoring, sediment trapping, and mass balance calculations were used. Total organic carbon mineralization showed a summer mean of 0.3 g C m−2 d−1 and was partitioned about equally between water and sediment. In the water column, organic matter was mineralized by bacteria (60%) and protozoan and metazoan zooplankton (30%), as well as by photooxidation (10%). Most of the mineralized organic carbon was of allochthonous origin. Primary production in the lake contributed at most 5% of the total organic carbon input and about 20% of the total organic carbon mineralization. Total carbon mineralization in the epilimnion and metalimnion agreed well with an estimate of CO2 evasion from the stratified lake, while CO2 accumulation in the hypolimnion matched the O2 consumption and resulted in a very negative dδ13C of DIC before autumn overturn (−23‰). Isotopic compositions of DIC and POC confirmed the dominant influence of terrestrial organic input on the cycling of both organic and inorganic carbon in the lake. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Limnology and Oceanography Wiley

Whole‐lake mineralization of allochthonous and autochthonous organic carbon in a large humic lake (örträsket, N. Sweden)

Download PDF
10 pages

Loading next page...
 
/lp/wiley/whole-lake-mineralization-of-allochthonous-and-autochthonous-organic-ggsOvzVt0u

References (31)

Publisher
Wiley
Copyright
© 2014, by the Association for the Sciences of Limnology and Oceanography
ISSN
0024-3590
eISSN
1939-5590
DOI
10.4319/lo.2001.46.7.1691
Publisher site
See Article on Publisher Site

Abstract

Organic carbon mineralization was studied in a large humic lake (Lake Ortrasket) in northern Sweden during a well‐defined summer stratification period following high water flow during snowmelt. Several independent methods including plankton counts, measurements of bacterioplankton and phytoplankton production, stable isotope monitoring, sediment trapping, and mass balance calculations were used. Total organic carbon mineralization showed a summer mean of 0.3 g C m−2 d−1 and was partitioned about equally between water and sediment. In the water column, organic matter was mineralized by bacteria (60%) and protozoan and metazoan zooplankton (30%), as well as by photooxidation (10%). Most of the mineralized organic carbon was of allochthonous origin. Primary production in the lake contributed at most 5% of the total organic carbon input and about 20% of the total organic carbon mineralization. Total carbon mineralization in the epilimnion and metalimnion agreed well with an estimate of CO2 evasion from the stratified lake, while CO2 accumulation in the hypolimnion matched the O2 consumption and resulted in a very negative dδ13C of DIC before autumn overturn (−23‰). Isotopic compositions of DIC and POC confirmed the dominant influence of terrestrial organic input on the cycling of both organic and inorganic carbon in the lake.

Journal

Limnology and Oceanography – Wiley

Published: Nov 1, 2001

There are no references for this article.