Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes
Abstract Through the microbial breakdown of organic matter and production of greenhouse gases (GHGs), small agricultural dams or ponds have recently been shown to make a relatively large contribution to freshwater ecosystem carbon cycling. However, current estimates of their total carbon dioxide‐equ...
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Online Access: | https://doi.org/10.1002/ecs2.2914 |
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doaj-d7bb9785e09940deac602919d0de96972020-11-25T02:54:57ZengWileyEcosphere2150-89252019-11-011011n/an/a10.1002/ecs2.2914Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processesQuinn R. Ollivier0Damien T. Maher1Chris Pitfield2Peter I. Macreadie3Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Geelong Victoria AustraliaSouthern Cross Geoscience Southern Cross University Lismore New South Wales 2480 AustraliaCorangamite Catchment Management Authority Colac Victoria 3250 AustraliaCentre for Integrative Ecology School of Life and Environmental Sciences Deakin University Geelong Victoria AustraliaAbstract Through the microbial breakdown of organic matter and production of greenhouse gases (GHGs), small agricultural dams or ponds have recently been shown to make a relatively large contribution to freshwater ecosystem carbon cycling. However, current estimates of their total carbon dioxide‐equivalent (CO2‐e) emissions lack inclusion of both seasonal and diel fluctuations. In addition, the atmospheric emissions of nitrous oxide from these often eutrophic systems have yet to be established. Here, we quantified the diffusive winter emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from 12 small agricultural dams within southeast Australia over a 24‐h period. The winter CO2‐e emissions of small agricultural water bodies were ~92% lower than previous summer estimates, at 1.02 g·m−2·d−1, while N2O contributed just 3.2% of this total. We also show that diel cycles do not significantly affect winter CO2, CH4, or N2O emission rates, and we discuss the likely carbon sources to these systems, through analyses of stable carbon isotopes (δ13C). The results from this study fill key gaps in our knowledge of agricultural dam GHG production and global atmospheric emissions, aiding their inclusion into future GHG budgets.https://doi.org/10.1002/ecs2.2914agriculturecarbon dioxidedamemissionsmethanenitrous oxide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Quinn R. Ollivier Damien T. Maher Chris Pitfield Peter I. Macreadie |
spellingShingle |
Quinn R. Ollivier Damien T. Maher Chris Pitfield Peter I. Macreadie Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes Ecosphere agriculture carbon dioxide dam emissions methane nitrous oxide |
author_facet |
Quinn R. Ollivier Damien T. Maher Chris Pitfield Peter I. Macreadie |
author_sort |
Quinn R. Ollivier |
title |
Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes |
title_short |
Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes |
title_full |
Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes |
title_fullStr |
Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes |
title_full_unstemmed |
Winter emissions of CO2, CH4, and N2O from temperate agricultural dams: fluxes, sources, and processes |
title_sort |
winter emissions of co2, ch4, and n2o from temperate agricultural dams: fluxes, sources, and processes |
publisher |
Wiley |
series |
Ecosphere |
issn |
2150-8925 |
publishDate |
2019-11-01 |
description |
Abstract Through the microbial breakdown of organic matter and production of greenhouse gases (GHGs), small agricultural dams or ponds have recently been shown to make a relatively large contribution to freshwater ecosystem carbon cycling. However, current estimates of their total carbon dioxide‐equivalent (CO2‐e) emissions lack inclusion of both seasonal and diel fluctuations. In addition, the atmospheric emissions of nitrous oxide from these often eutrophic systems have yet to be established. Here, we quantified the diffusive winter emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from 12 small agricultural dams within southeast Australia over a 24‐h period. The winter CO2‐e emissions of small agricultural water bodies were ~92% lower than previous summer estimates, at 1.02 g·m−2·d−1, while N2O contributed just 3.2% of this total. We also show that diel cycles do not significantly affect winter CO2, CH4, or N2O emission rates, and we discuss the likely carbon sources to these systems, through analyses of stable carbon isotopes (δ13C). The results from this study fill key gaps in our knowledge of agricultural dam GHG production and global atmospheric emissions, aiding their inclusion into future GHG budgets. |
topic |
agriculture carbon dioxide dam emissions methane nitrous oxide |
url |
https://doi.org/10.1002/ecs2.2914 |
work_keys_str_mv |
AT quinnrollivier winteremissionsofco2ch4andn2ofromtemperateagriculturaldamsfluxessourcesandprocesses AT damientmaher winteremissionsofco2ch4andn2ofromtemperateagriculturaldamsfluxessourcesandprocesses AT chrispitfield winteremissionsofco2ch4andn2ofromtemperateagriculturaldamsfluxessourcesandprocesses AT peterimacreadie winteremissionsofco2ch4andn2ofromtemperateagriculturaldamsfluxessourcesandprocesses |
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