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| Titel |
Derivation of greenhouse gas emission factors for peatlands managed for extraction in the Republic of Ireland and the United Kingdom |
| VerfasserIn |
D. Wilson, S. D. Dixon, R. R. E. Artz, T. E. L. Smith, C. D. Evans, H. J. F. Owen, E. Archer, F. Renou-Wilson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 18 ; Nr. 12, no. 18 (2015-09-16), S.5291-5308 |
| Datensatznummer |
250118090
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| Publikation (Nr.) |
 copernicus.org/bg-12-5291-2015.pdf |
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| Zusammenfassung |
| Drained peatlands are significant hotspots of carbon dioxide (CO2)
emissions and may also be more vulnerable to fire with its associated gaseous emissions. Under the United Nations Framework
Convention on Climate Change (UNFCCC) and the Kyoto Protocol, greenhouse gas
(GHG) emissions from peatlands managed for extraction are reported on an
annual basis. However, the Tier 1 (default) emission factors (EFs) provided
in the IPCC 2013 Wetlands Supplement for this land use category may not be
representative in all cases and countries are encouraged to move to
higher-tier reporting levels with reduced uncertainty levels based on
country- or regional-specific data. In this study, we quantified (1)
CO2-C emissions from nine peat extraction sites in the Republic of
Ireland and the United Kingdom, which were initially disaggregated by land
use type (industrial versus domestic peat extraction), and (2) a range of
GHGs that are released to the atmosphere with the burning of peat.
Drainage-related methane (CH4) and nitrous oxide (N2O) emissions as
well as CO2-C emissions associated with the off-site decomposition of
horticultural peat were not included here. Our results show that net
CO2-C emissions were strongly controlled by soil temperature at the
industrial sites (bare peat) and by soil temperature and leaf area index at
the vegetated domestic sites. Our derived EFs of 1.70 (±0.47) and 1.64
(±0.44) t CO2-C ha−1 yr−1 for the industrial and
domestic sites respectively are considerably lower than the Tier 1 EF
(2.8 ± 1.7 t CO2-C ha−1 yr−1) provided in the
Wetlands Supplement. We propose that the difference between our derived
values and the Wetlands Supplement value is due to differences in peat
quality and, consequently, decomposition rates. Emissions from burning of the
peat (g kg−1 dry fuel burned) were estimated to be approximately 1346
CO2, 8.35 methane (CH4), 218 carbon monoxide (CO), 1.53 ethane
(C2H6), 1.74 ethylene (C2H4), 0.60 methanol (CH3OH),
2.21 hydrogen cyanide (HCN) and 0.73 ammonia (NH3), and this emphasises
the importance of understanding the full suite of trace gas emissions from
biomass burning. Our results highlight the importance of generating reliable
Tier 2 values for different regions and land use categories. Furthermore,
given that the IPCC Tier 1 EF was only based on 20 sites (all from Canada and
Fennoscandia), we suggest that data from another 9 sites significantly expand
the global data set, as well as adding a new region. |
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