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| Titel |
Heterotrophic and autotrophic soil respiration in an alpine grassland |
| VerfasserIn |
Chiara Ferré, Francesco Vaninetti, Roberto Comolli |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053194
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| Zusammenfassung |
| While soil respiration has been well characterized for a wide range of forest ecosystems,
comparatively little is known for grasslands.
Related to this, our study was aimed at monitoring of soil CO2 efflux and at its
partitioning into heterotrophic and autotrophic contributions, applying the indirect linear
regression method, in a sinkhole (about 1.5 ha) of Italian southern Alps (Valchiavenna –
Lombardy) used as cattle pasture, at about 1900 m a.s.l.
The measurements of soil CO2 rates were carried out on 8 dates during the growing
season (June-September 2010), between 11 a.m. and 2 p.m., using a portable infrared gas
analyzer (PP-system) equipped with a dynamic chamber; 33 monitoring points were selected,
distributed to cover the main soil (Cambisols, Leptosols, Podzols, Phaeozems) and
vegetation types (Nardetum, Seslerio-Semperviretum, earth hummocks, tall herbs),
as well as the different aspects. Aboveground vegetation was removed before the
beginning of the measurements. Together with soil respiration, soil temperature and soil
water content at a depth of 5 and 0-6 cm respectively, were measured. Only at the
end of the experiment, samples were collected from the upper 10 cm of the soil to
determine root density (2 mm diameter class) and soil organic carbon
content.
Results showed that the mean soil respiration was 4.5±2.1 μmol CO2 m-2s-1, ranging
from 1.5 (September) and 7.4 (July) μmol CO2 m-2s-1.
For all the sampling dates the total soil respiration resulted significantly correlated (p
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