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| Titel |
Does Juncus effusus enhance methane emissions from grazed pastures on peat? |
| VerfasserIn |
A. Henneberg, L. Elsgaard, B. K. Sorrell, H. Brix, S. O. Petersen |
| 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. 19 ; Nr. 12, no. 19 (2015-10-07), S.5667-5676 |
| Datensatznummer |
250118113
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| Publikation (Nr.) |
 copernicus.org/bg-12-5667-2015.pdf |
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| Zusammenfassung |
| Methane (CH4) emissions from drained organic soils are generally low,
but internal gas transport in aerenchymatous plants may result in local
emission hotspots. In a paired-sample field study at three different sites
we measured fluxes of CH4 with static chambers from adjacent sampling
quadrats with and without Juncus effusus during four field campaigns. At all three sites,
CH4 was observed in the soil at all sampling depths (5 to 100 cm),
and in most cases both above and below the groundwater table. During spring,
local maxima suggested methanogenesis also took place above the water table at
all three sites. We found significant CH4 emissions at all three sites,
but emission controls were clearly different. Across the three sites,
average emission rates (±1 SE) for sampling quadrats with and without
J. effusus were 1.47 ± 0.28 and 1.37 ± 0.33 mg CH4 m−2 h−1, respectively, with no overall effect of J. effusus on
CH4 emissions. However, a significant effect of J. effusus was seen at one of
the three sites. At this site, local CH4 maxima were closer to the
soil surface than at the other sites, and the upper soil layers were dryer.
This could have affected both root CH4 accessibility and CH4 oxidation respectively, and together with limited gas diffusivity in the
soil column, cause elevated CH4 emissions from J. effusus. We conclude that
J. effusus has the potential to act as point sources of CH4
from drained peatlands, but more studies on the specific conditions under
which there is an effect, are needed before the results can be used in
modelling of CH4 emissions. |
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