Dissolved organic carbon dynamics in the peat-streamwater interface
A series of experiments were conducted to address the fate of dissolved organic carbon (DOC) in the peat - stream interface zone linking a minerotrophic poor fen and an ombrotrophic mire with surrounding stream water in the drainage area of Lake Ortrasket in northern Sweden. Transport and mineralisa...
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ftulundlup:oai:lup.lub.lu.se:4e8f8300-8157-4547-b32b-e67405e88515 2023-05-15T17:44:59+02:00 Dissolved organic carbon dynamics in the peat-streamwater interface Bengtsson, Göran Törneman, Niklas 2004 https://lup.lub.lu.se/record/135787 https://doi.org/10.1023/B:BIOG.0000049338.81809.7c eng eng Springer https://lup.lub.lu.se/record/135787 http://dx.doi.org/10.1023/B:BIOG.0000049338.81809.7c wos:000225323600005 scopus:9644255720 Biogeochemistry; 70(1), pp 93-116 (2004) ISSN: 1573-515X Ecology contributiontojournal/article info:eu-repo/semantics/article text 2004 ftulundlup https://doi.org/10.1023/B:BIOG.0000049338.81809.7c 2023-02-01T23:28:32Z A series of experiments were conducted to address the fate of dissolved organic carbon (DOC) in the peat - stream interface zone linking a minerotrophic poor fen and an ombrotrophic mire with surrounding stream water in the drainage area of Lake Ortrasket in northern Sweden. Transport and mineralisation of DOC were quantified in peat - stream interface cores in response to variations in pore water velocity, DOC concentration and the molecular size and source of DOC. Mineralisation and CH4 production were positively correlated with pore water velocity at rates between 0.08 and 0.20 cm h(-1) and negatively correlated at rates between 0.20 and 0.40 cm h(-1). The DOC concentration of the effluent from the peat cores was independent of the pore water velocity but proportional to the DOC concentration of the source water. Higher concentrations of DOC were exported from than imported to the peat cores, and the cores exported DOC molecules of smaller average molecular size than received. Carbon mineralisation in the peat, assessed in a static system, was independent of the concentration of DOC. DOC with a nominal cutoff at 100 Da was mineralised faster by streamwater bacteria than DOC dialysed with a cutoff at 3500 Da, and their mineralisation rate was positively correlated with the DOC concentration. Streamwater bacteria mineralised streamwater DOC at a lower rate than the peat - stream interface zone pore water DOC. The pattern of velocity dependence of mineralisation was the same for both sources of peat DOC but the mineralisation rates, average molecular size, and bioavailability of DOC were different, emphasising the importance of the compositional heterogeneity of the peat - stream interface zone for the DOC budget of streamwater. Article in Journal/Newspaper Northern Sweden Lund University Publications (LUP) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology |
spellingShingle |
Ecology Bengtsson, Göran Törneman, Niklas Dissolved organic carbon dynamics in the peat-streamwater interface |
topic_facet |
Ecology |
description |
A series of experiments were conducted to address the fate of dissolved organic carbon (DOC) in the peat - stream interface zone linking a minerotrophic poor fen and an ombrotrophic mire with surrounding stream water in the drainage area of Lake Ortrasket in northern Sweden. Transport and mineralisation of DOC were quantified in peat - stream interface cores in response to variations in pore water velocity, DOC concentration and the molecular size and source of DOC. Mineralisation and CH4 production were positively correlated with pore water velocity at rates between 0.08 and 0.20 cm h(-1) and negatively correlated at rates between 0.20 and 0.40 cm h(-1). The DOC concentration of the effluent from the peat cores was independent of the pore water velocity but proportional to the DOC concentration of the source water. Higher concentrations of DOC were exported from than imported to the peat cores, and the cores exported DOC molecules of smaller average molecular size than received. Carbon mineralisation in the peat, assessed in a static system, was independent of the concentration of DOC. DOC with a nominal cutoff at 100 Da was mineralised faster by streamwater bacteria than DOC dialysed with a cutoff at 3500 Da, and their mineralisation rate was positively correlated with the DOC concentration. Streamwater bacteria mineralised streamwater DOC at a lower rate than the peat - stream interface zone pore water DOC. The pattern of velocity dependence of mineralisation was the same for both sources of peat DOC but the mineralisation rates, average molecular size, and bioavailability of DOC were different, emphasising the importance of the compositional heterogeneity of the peat - stream interface zone for the DOC budget of streamwater. |
format |
Article in Journal/Newspaper |
author |
Bengtsson, Göran Törneman, Niklas |
author_facet |
Bengtsson, Göran Törneman, Niklas |
author_sort |
Bengtsson, Göran |
title |
Dissolved organic carbon dynamics in the peat-streamwater interface |
title_short |
Dissolved organic carbon dynamics in the peat-streamwater interface |
title_full |
Dissolved organic carbon dynamics in the peat-streamwater interface |
title_fullStr |
Dissolved organic carbon dynamics in the peat-streamwater interface |
title_full_unstemmed |
Dissolved organic carbon dynamics in the peat-streamwater interface |
title_sort |
dissolved organic carbon dynamics in the peat-streamwater interface |
publisher |
Springer |
publishDate |
2004 |
url |
https://lup.lub.lu.se/record/135787 https://doi.org/10.1023/B:BIOG.0000049338.81809.7c |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Biogeochemistry; 70(1), pp 93-116 (2004) ISSN: 1573-515X |
op_relation |
https://lup.lub.lu.se/record/135787 http://dx.doi.org/10.1023/B:BIOG.0000049338.81809.7c wos:000225323600005 scopus:9644255720 |
op_doi |
https://doi.org/10.1023/B:BIOG.0000049338.81809.7c |
_version_ |
1766147676823355392 |