dc.contributor |
Landbúnaðarháskóli Íslands |
dc.contributor |
Agricultural University of Iceland |
dc.contributor.author |
Maljanen, Marja |
dc.contributor.author |
Bhattarai, Hem Raj |
dc.contributor.author |
Biasi, Christina |
dc.contributor.author |
Sigurdsson, Bjarni D. |
dc.date.accessioned |
2019-01-18T11:42:39Z |
dc.date.available |
2019-01-18T11:42:39Z |
dc.date.issued |
2018 |
dc.identifier.citation |
Maljanen, M., Bhattarai, H.M., Biasi, C. & Sigurdsson, B.D.2018. The effect of geothermal soil warming on the production of carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), nitric oxide (NO) and nitrous acid (HONO) from forest soil in southern Iceland. Icelandic Agricultural Sciences 31( 11-22) |
dc.identifier.issn |
2298-786X |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/989 |
dc.description.abstract |
Geothermal areas can be local sources of greenhouse gases, both directly from the geothermal system or because of soil warming effects on biological sources. In this study we repeated field measurements methane (CH4) and nitrous oxide (N2O) fluxes along the soil temperature (Ts) gradient in a Sitka spruce (Picea sitchensis) stand at the ForHot study site in southern Iceland, where geothermal soil warming had started eight years earlier. We complemented these results with in situ measurements of carbon dioxide (CO2) and topsoil sampled in the same plots to study the production rates of those gases at 20 °C in the laboratory, as well as nitric oxide (NO) and nitrous acid (HONO). We showed that the eight year long exposure to elevated Ts had changed the topsoil, including its microbial properties and the production potentials of these gases. However, the production rates of CO2, CH4 and N2O measured in laboratory conditions did not clearly follow the in situ fluxes. We discuss both adaptation of microbes and origin of greenhouse gases (depth patterns and microbial vs. geothermal sources) as possible reasons for these discrepancies. |
dc.description.abstract |
Jarðhitasvæði geta verið uppsprettur ýmissa gróðurhúsalofttegunda, annað hvort beint upp úr jarðhitakerfinu eða vegna áhrifa aukins jarðvegshita á ýmsa lífræna ferla. Í þessari rannsókn endurtókum við mælingar á flæði metans (CH4) og hláturgass (N2O) með auknum jarðvegshita (Ts) í foldu í sitkagreniskógi (Picea sitchensis) á ForHot rannsóknasvæðinu á Suðurlandi, þar sem jarðhitasvæði hafði færst undir átta árum áður. Við bættum einnig við mælingum á losun koldíoxíðs (CO2) í foldu og bárum - niðurstöðurnar saman við losun þessara sömu gastegunda og nituroxíðs (NO) og nitraðrar sýru (HONO) úr jarðvegskjörnum úr sömu reitum sem mældir voru við 20 °C á rannsóknastofu. Niðurstöðurnar sýndu að átta ára jarðvegshlýnun hafði bæði breytt efnasamsetningu og örveruflóru reitanna og þar með getu til að framleiða áðurnefndar lofttegundir. Hinsvegar breyttist framleiðslugeta CO2, CH4 og N2O við 20 °C ekki reglulega með auknum Ts í foldu. Við ræðum bæði aðlögun örvera að auknum hita og hvernig uppruni gróðurhúsalofttegunda (úr mismunandi dýpi í jarðvegi og hvort hann er líffræðilegur eða jarðfræðilegur) getur mögulega útskýrt þær niðurstöður sem við fengum. |
dc.description.sponsorship |
The project was funded by the Academy of Finland (no. 297735 and no. 132045). This work also contributes to the ForHot-Forest (Project No.163272-051 of the Icelandic Research Council), as well as to the Nordic CAR-ES project and the ClimMani COST Action (ES1308) and the International Program CryoCARB and COUP. The Kuopio Naturalists’ Society is thanked for a travel grant. Jaana Rissanen is thanked for assisting in the laboratory at the University of Eastern Finland. We also want to acknowledge
the staff at the Reykir campus of the Agricultural University of Iceland for great logistic support. |
dc.format.extent |
11-22 |
dc.language.iso |
en |
dc.publisher |
Agricultural University of Iceland |
dc.relation.ispartofseries |
Icelandic Agricultural Sciences;2018(31) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Soil warming |
dc.subject |
Volcanic soil |
dc.subject |
Greenhouse gasses |
dc.subject |
Sitkagreni |
dc.subject |
Gróðurhúsalofttegundir |
dc.subject |
Jarðvegsrannsóknir |
dc.subject |
Jarðhiti |
dc.title |
The effect of geothermal soil warming on the production of carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), nitric oxide (NO) and nitrous acid (HONO) from forest soil in southern Iceland |
dc.title.alternative |
Áhrif hækkaðs jarðvegshita á myndun koldíoxíðs (CO2 ), metans (CH4 ), hláturgass (N2 O), nituroxíðs (NO) og nitraðrar sýru (HONO) í skógarjarðvegi á Suðurlandi. |
dc.type |
info:eu-repo/semantics/article |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
Icelandic Agricultural Sciences |
dc.identifier.doi |
10.16886/IAS.2018.02 |
dc.relation.url |
http://ias.is/wp-content/uploads/2018/09/The-effect-of-geothermal-soil-warming-on-the-production-of-carbon.pdf |
dc.contributor.department |
Auðlinda- og umhverfisdeild (LBHÍ) |
dc.contributor.department |
Faculty of Natural Resources and Environmental Sciences (AUI) |