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| Titel |
Impact of earthworm Lumbricus terrestris living sites on the greenhouse gas balance of no-till arable soil |
| VerfasserIn |
M. Nieminen, T. Hurme, J. Mikola, K. Regina, V. Nuutinen |
| 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 (2015-09-23), S.5481-5493 |
| Datensatznummer |
250118100
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| Publikation (Nr.) |
 copernicus.org/bg-12-5481-2015.pdf |
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| Zusammenfassung |
| We studied the effect of the deep-burrowing earthworm Lumbricus
terrestris on the greenhouse gas (GHG) fluxes and global warming potential
(GWP) of arable no-till soil using both field measurements and a controlled
15-week laboratory experiment. In the field, the emissions of nitrous oxide
(N2O) and carbon dioxide (CO2) were on average 43 and 32 %
higher in areas occupied by L. terrestris (the presence judged by
the surface midden) than in adjacent, unoccupied areas (with no midden). The
fluxes of methane (CH4) were variable and had no consistent difference
between the midden and non-midden areas. Removing the midden did not affect
soil N2O and CO2 emissions. The laboratory results were consistent
with the field observations in that the emissions of N2O and CO2
were on average 27 and 13 % higher in mesocosms with than without
L. terrestris. Higher emissions of N2O were most likely due to
the higher content of mineral nitrogen and soil moisture under the middens,
whereas L. terrestris respiration fully explained the observed
increase in CO2 emissions in the laboratory. In the field, the
significantly elevated macrofaunal densities in the vicinity of middens
likely contributed to the higher emissions from areas occupied by L.
terrestris. The activity of L. terrestris increased the GWP of
field and laboratory soil by 50 and 18 %, but only 6 and 2 % of this
increase was due to the enhanced N2O emission. Our results suggest that
high N2O emissions commonly observed in no-till soils can partly be
explained by the abundance of L. terrestris under no-till management
and that L. terrestris can markedly regulate the climatic effects of
different cultivation practises. |
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