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Global importance of methane emissions from drainage ditches and canals

Peacock, Michael and Audet, J. and Bastviken, D. and Futter, Martyn and Gauci, V. and Grinham, A. and Harrison, J. A. and Kent, M. S. and Kosten, S. and Lovelock, C. E. and Veraart, A. J. and Evans, Christopher (2021). Global importance of methane emissions from drainage ditches and canals. Environmental Research Letters. 16 , 044010
[Research article]

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Abstract

Globally, there are millions of kilometres of drainage ditches which have the potential to emit the powerful greenhouse gas methane (CH4), but these emissions are not reported in budgets of inland waters or drained lands. Here, we synthesise data to show that ditches spanning a global latitudinal gradient and across different land uses emit large quantities of CH4 to the atmosphere. Area-specific emissions are comparable to those from lakes, streams, reservoirs, and wetlands. While it is generally assumed that drainage negates terrestrial CH4 emissions, we find that CH4 emissions from ditches can, on average, offset ~10% of this reduction. Using global areas of drained land we show that ditches contribute 3.5 Tg CH4 yr−1 (0.6–10.5 Tg CH4 yr−1); equivalent to 0.2%–3% of global anthropogenic CH4 emissions. A positive relationship between CH4 emissions and temperature was found, and emissions were highest from eutrophic ditches. We advocate the inclusion of ditch emissions in national GHG inventories, as neglecting them can lead to incorrect conclusions concerning the impact of drainage-based land management on CH4 budgets.

Authors/Creators:Peacock, Michael and Audet, J. and Bastviken, D. and Futter, Martyn and Gauci, V. and Grinham, A. and Harrison, J. A. and Kent, M. S. and Kosten, S. and Lovelock, C. E. and Veraart, A. J. and Evans, Christopher
Title:Global importance of methane emissions from drainage ditches and canals
Series Name/Journal:Environmental Research Letters
Year of publishing :2021
Volume:16
Article number:044010
Number of Pages:11
ISSN:1748-9326
Language:English
Publication Type:Research 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 > Climate Research
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
URN:NBN:urn:nbn:se:slu:epsilon-p-111637
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111637
Additional ID:
Type of IDID
DOI10.1088/1748-9326/abeb36
ID Code:23368
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:29 Apr 2021 09:43
Metadata Last Modified:29 Apr 2021 09:51

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