| 47787 |
Creator |
9afccdbe975e25965953e777bb4d6a5f |
| 47787 |
Creator |
77f2660608975f4afe2bd2c94b5a0083 |
| 47787 |
Creator |
ext-7d249947a37af2c5e6fed04238bce908 |
| 47787 |
Creator |
ext-e44b9fae2c8f3fb5b4fa65c1da1983ea |
| 47787 |
Date |
2017-02 |
| 47787 |
Is Part Of |
repository |
| 47787 |
Is Part Of |
p18791026 |
| 47787 |
abstract |
Globally, large areas of peatland have been drained through the digging of ditches,
generally to increase agricultural production. By lowering the water table it is
often assumed that drainage reduces landscape-scale emissions of methane (CH<sub>4</sub>)
into the atmosphere to negligible levels. However, drainage ditches themselves are
known to be sources of CH<sub>4</sub> and other greenhouse gases (GHGs), but emissions
data are scarce, particularly for carbon dioxide (CO<sub>2</sub>) and nitrous oxide
(N<sub>2</sub>O), and show high spatial and temporal variability. Here, we report
dissolved GHGs and diffusive fluxes of CH<sub>4</sub> and CO<sub>2</sub> from ditches
at three UK lowland fens under different management; semi-natural fen, cropland, and
cropland restored to low-intensity grassland. Ditches at all three fens emitted GHGs
to the atmosphere, but both fluxes and dissolved GHGs showed extensive variation both
seasonally and within-site. CH<sub>4</sub> fluxes were particularly large, with medians
peaking at all three sites in August at 120-230 mg m<sup>-2</sup> d<sup>-1</sup>.
Significant between site differences were detected between the cropland and the other
two sites for CO<sub>2</sub> flux and all three dissolved GHGs, suggested that intensive
agriculture has major effects on ditch biogeochemistry. Multiple regression models
using environmental and water chemistry data were able to explain 29-59% of observed
variation in dissolved GHGs. Annual CH<sub>4</sub> fluxes from the ditches were 37.8,
18.3 and 27.2 g CH<sub>4</sub> m<sup>-2</sup> yr<sup>-1</sup> for the semi-natural,
grassland and cropland, and annual CO<sub>2</sub> fluxes were similar (1100 to 1440
g CO<sub>2</sub> m<sup>-2</sup> yr<sup>-1</sup>) among sites. We suggest that fen
ditches are important contributors to landscape-scale GHG emissions, particularly
for CH<sub>4</sub>. Ditch emissions should be included in GHG budgets of human modified
fens, particularly where drainage has removed the original terrestrial CH<sub>4</sub>
source, e.g. agricultural peatlands. |
| 47787 |
authorList |
authors |
| 47787 |
status |
peerReviewed |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529172 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529182 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529183 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529184 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529185 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529186 |
| 47787 |
uri |
http://data.open.ac.uk/oro/document/529786 |
| 47787 |
volume |
578 |
| 47787 |
type |
AcademicArticle |
| 47787 |
type |
Article |
| 47787 |
label |
Peacock, Mike ; Ridley, Luke; Evans, Chris D. and Gauci, Vincent (2017). Management
Effects on Greenhouse Gas Dynamics in Fen Ditches. Science of the Total Environment,
578 pp. 601–612. |
| 47787 |
label |
Peacock, Mike ; Ridley, Luke; Evans, Chris D. and Gauci, Vincent (2017). Management
Effects on Greenhouse Gas Dynamics in Fen Ditches. Science of the Total Environment,
578 pp. 601–612. |
| 47787 |
Title |
Management Effects on Greenhouse Gas Dynamics in Fen Ditches |
| 47787 |
in dataset |
oro |