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Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams

Stream water dissolved oxygen was monitored in a 3.2km(2) moorland headwater catchment in the Scottish Highlands. The stream consists of three 1(st) order headwaters and a 2(nd) order main stem. The stream network is fringed by peat soils with no riparian trees, though dwarf shrubs provide shading i...

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Autores principales: Dick, Jonathan J., Soulsby, Chris, Birkel, Christian, Malcolm, Iain, Tetzlaff, Doerthe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4996464/
https://www.ncbi.nlm.nih.gov/pubmed/27556278
http://dx.doi.org/10.1371/journal.pone.0161363
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author Dick, Jonathan J.
Soulsby, Chris
Birkel, Christian
Malcolm, Iain
Tetzlaff, Doerthe
author_facet Dick, Jonathan J.
Soulsby, Chris
Birkel, Christian
Malcolm, Iain
Tetzlaff, Doerthe
author_sort Dick, Jonathan J.
collection PubMed
description Stream water dissolved oxygen was monitored in a 3.2km(2) moorland headwater catchment in the Scottish Highlands. The stream consists of three 1(st) order headwaters and a 2(nd) order main stem. The stream network is fringed by peat soils with no riparian trees, though dwarf shrubs provide shading in the lower catchment. Dissolved oxygen (DO) is regulated by the balance between atmospheric re-aeration and the metabolic processes of photosynthesis and respiration. DO was continuously measured for >1 year and the data used to calibrate a mass balance model, to estimate primary production, respiration and re-aeration for a 1(st) order site and in the 2(nd) order main stem. Results showed that the stream was always heterotrophic at both sites. Sites were most heterotrophic in the summer reflecting higher levels of stream metabolism. The 1(st) order stream appeared more heterotrophic which was consistent with the evident greater biomass of macrophytes in the 2(nd) order stream, with resulting higher primary productivity. Comparison between respiration, primary production, re-aeration and potential physical controls revealed only weak relationships. However, the most basic model parameters (e.g. the parameter linking light and photosynthesis) controlling ecosystem processes resulted in significant differences between the sites which seem related to the stream channel geometry.
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spelling pubmed-49964642016-09-12 Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams Dick, Jonathan J. Soulsby, Chris Birkel, Christian Malcolm, Iain Tetzlaff, Doerthe PLoS One Research Article Stream water dissolved oxygen was monitored in a 3.2km(2) moorland headwater catchment in the Scottish Highlands. The stream consists of three 1(st) order headwaters and a 2(nd) order main stem. The stream network is fringed by peat soils with no riparian trees, though dwarf shrubs provide shading in the lower catchment. Dissolved oxygen (DO) is regulated by the balance between atmospheric re-aeration and the metabolic processes of photosynthesis and respiration. DO was continuously measured for >1 year and the data used to calibrate a mass balance model, to estimate primary production, respiration and re-aeration for a 1(st) order site and in the 2(nd) order main stem. Results showed that the stream was always heterotrophic at both sites. Sites were most heterotrophic in the summer reflecting higher levels of stream metabolism. The 1(st) order stream appeared more heterotrophic which was consistent with the evident greater biomass of macrophytes in the 2(nd) order stream, with resulting higher primary productivity. Comparison between respiration, primary production, re-aeration and potential physical controls revealed only weak relationships. However, the most basic model parameters (e.g. the parameter linking light and photosynthesis) controlling ecosystem processes resulted in significant differences between the sites which seem related to the stream channel geometry. Public Library of Science 2016-08-24 /pmc/articles/PMC4996464/ /pubmed/27556278 http://dx.doi.org/10.1371/journal.pone.0161363 Text en © 2016 Dick et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Dick, Jonathan J.
Soulsby, Chris
Birkel, Christian
Malcolm, Iain
Tetzlaff, Doerthe
Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title_full Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title_fullStr Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title_full_unstemmed Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title_short Continuous Dissolved Oxygen Measurements and Modelling Metabolism in Peatland Streams
title_sort continuous dissolved oxygen measurements and modelling metabolism in peatland streams
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4996464/
https://www.ncbi.nlm.nih.gov/pubmed/27556278
http://dx.doi.org/10.1371/journal.pone.0161363
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