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Carbon dioxide dynamics in an agricultural headwater stream driven by hydrology and primary production

Wallin, Marcus and Audet, Joachim and Peacock, Michael and Sahlee, Erik and Winterdahl, Mattias (2020). Carbon dioxide dynamics in an agricultural headwater stream driven by hydrology and primary production. Biogeosciences. 17 , 2487-2498
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Abstract

Headwater streams are known to be hotspots for carbon dioxide (CO2) emissions to the atmosphere and are hence important components in landscape carbon balances. However, surprisingly little is known about stream CO2 dynamics and emissions in agricultural settings, a land use type that globally covers ca. 40% of the continental area. Here we present hourly measured in situ stream CO2 concentration data from a 11.3 km(2) temperate agricultural headwater catchment covering more than 1 year (in total 339 d excluding periods of ice and snow cover). The stream CO2 concentrations during the entire study period were generally high (median 3.44 mg C L-1, corresponding to partial pressures (pCO(2)) of 4778 mu atm) but were also highly variable (IQR = 3.26 mgC L-1). The CO2 concentration dynamics covered a variety of different timescales from seasonal to hourly, with an interplay of hydrological and biological controls. The hydrological control was strong (although with both positive and negative influences dependent on season), and CO2 concentrations changed rapidly in response to rainfall and snowmelt events. However, during growing-season base flow and receding flow conditions, aquatic primary production seemed to control the stream CO2 dynamics, resulting in elevated diel patterns. During the dry summer period, rapid rewetting following precipitation events generated high CO2 pulses exceeding the overall median level of stream CO2 (up to 3 times higher) observed during the whole study period. This finding highlights the importance of stream intermittency and its effect on stream CO2 dynamics. Given the observed high levels of CO2 and its temporally variable nature, agricultural streams clearly need more attention in order to understand and incorporate these considerable dynamics in large-scale extrapolations.

Authors/Creators:Wallin, Marcus and Audet, Joachim and Peacock, Michael and Sahlee, Erik and Winterdahl, Mattias
Title:Carbon dioxide dynamics in an agricultural headwater stream driven by hydrology and primary production
Year of publishing :2020
Volume:17
Page range:2487-2498
Number of Pages:12
Publisher:European Geosciences Union
ISSN:1726-4170
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:agriculture, headwater stream, carbon dioxide, hydrology
URN:NBN:urn:nbn:se:slu:epsilon-p-105655
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105655
Additional ID:
Type of IDID
DOI10.5194/bg-17-2487-2020
Web of Science (WoS)000531868800001
ID Code:17095
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:18 Jun 2020 11:48
Metadata Last Modified:09 Aug 2020 17:31

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