Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem
Carbon fluxes between natural ecosystems and the atmosphere have received increased attention in recent years due to the impact they have on climate. In order to investigate independently how soil moisture and temperature control carbon fluxes into and out of a dry subarctic dwarf shrub dominated he...
Published in: | Biogeochemistry |
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Online Access: | https://lup.lub.lu.se/record/254982 https://doi.org/10.1007/s10533-003-0855-2 |
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ftulundlup:oai:lup.lub.lu.se:581a24c0-9acf-4c4a-9825-2e26b109cc53 2023-05-15T15:13:23+02:00 Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem Illeris, L Christensen, Torben Mastepanov, Mikhail 2004 https://lup.lub.lu.se/record/254982 https://doi.org/10.1007/s10533-003-0855-2 eng eng Springer https://lup.lub.lu.se/record/254982 http://dx.doi.org/10.1007/s10533-003-0855-2 wos:000226519100002 scopus:84856505382 Biogeochemistry; 70(3), pp 315-330 (2004) ISSN: 1573-515X Physical Geography soil respiration soil moisture dry tundra Arctic carbon flux temperature sensitivity contributiontojournal/article info:eu-repo/semantics/article text 2004 ftulundlup https://doi.org/10.1007/s10533-003-0855-2 2023-02-01T23:32:39Z Carbon fluxes between natural ecosystems and the atmosphere have received increased attention in recent years due to the impact they have on climate. In order to investigate independently how soil moisture and temperature control carbon fluxes into and out of a dry subarctic dwarf shrub dominated heath, monoliths containing soil and plants were incubated at three different moisture levels and subjected to four different temperature levels between 7 and 20degreesC. Ecosystem CO2 exchange was monitored continuously day and night during the 16 to 18 days that each of three experiments lasted. Additionally, the carbon allocation pattern of the plants was investigated by labelling monoliths with (CO2)-C-14 followed by harvest of above and below ground plant parts. The results revealed that the three different soil moisture levels caused distinctly differing levels Of CO2 fluxes. Also, both carbon fixation calculated as gross ecosystem production (GEP) and carbon release measured as ecosystem respiration (ER) increased with increasing temperatures, with ER increasing faster than GER Hence, short term carbon loss from the ecosystem accelerated with raised temperatures. Temperature sensitivity of the ecosystem was dependent on the soil moisture level, shown by differing Q(10) values of both GEP and ER at different soil moisture levels. It is therefore highly important to take soil moisture levels into consideration when evaluating responses of ecosystem carbon balance to changes in temperature. The greatest C fixation took place via the two most dominant species of the ecosystem, Vaccinium uliginosum and Empetrum hermaphroditum, with the former being responsible for the different size of C fixation at the three moisture levels. Article in Journal/Newspaper Arctic Subarctic Tundra Lund University Publications (LUP) Arctic Biogeochemistry 70 3 315 330 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography soil respiration soil moisture dry tundra Arctic carbon flux temperature sensitivity |
spellingShingle |
Physical Geography soil respiration soil moisture dry tundra Arctic carbon flux temperature sensitivity Illeris, L Christensen, Torben Mastepanov, Mikhail Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
topic_facet |
Physical Geography soil respiration soil moisture dry tundra Arctic carbon flux temperature sensitivity |
description |
Carbon fluxes between natural ecosystems and the atmosphere have received increased attention in recent years due to the impact they have on climate. In order to investigate independently how soil moisture and temperature control carbon fluxes into and out of a dry subarctic dwarf shrub dominated heath, monoliths containing soil and plants were incubated at three different moisture levels and subjected to four different temperature levels between 7 and 20degreesC. Ecosystem CO2 exchange was monitored continuously day and night during the 16 to 18 days that each of three experiments lasted. Additionally, the carbon allocation pattern of the plants was investigated by labelling monoliths with (CO2)-C-14 followed by harvest of above and below ground plant parts. The results revealed that the three different soil moisture levels caused distinctly differing levels Of CO2 fluxes. Also, both carbon fixation calculated as gross ecosystem production (GEP) and carbon release measured as ecosystem respiration (ER) increased with increasing temperatures, with ER increasing faster than GER Hence, short term carbon loss from the ecosystem accelerated with raised temperatures. Temperature sensitivity of the ecosystem was dependent on the soil moisture level, shown by differing Q(10) values of both GEP and ER at different soil moisture levels. It is therefore highly important to take soil moisture levels into consideration when evaluating responses of ecosystem carbon balance to changes in temperature. The greatest C fixation took place via the two most dominant species of the ecosystem, Vaccinium uliginosum and Empetrum hermaphroditum, with the former being responsible for the different size of C fixation at the three moisture levels. |
format |
Article in Journal/Newspaper |
author |
Illeris, L Christensen, Torben Mastepanov, Mikhail |
author_facet |
Illeris, L Christensen, Torben Mastepanov, Mikhail |
author_sort |
Illeris, L |
title |
Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
title_short |
Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
title_full |
Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
title_fullStr |
Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
title_full_unstemmed |
Moisture effects on temperature sensitivity of CO2 exchange in a subarctic heath ecosystem |
title_sort |
moisture effects on temperature sensitivity of co2 exchange in a subarctic heath ecosystem |
publisher |
Springer |
publishDate |
2004 |
url |
https://lup.lub.lu.se/record/254982 https://doi.org/10.1007/s10533-003-0855-2 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic Tundra |
genre_facet |
Arctic Subarctic Tundra |
op_source |
Biogeochemistry; 70(3), pp 315-330 (2004) ISSN: 1573-515X |
op_relation |
https://lup.lub.lu.se/record/254982 http://dx.doi.org/10.1007/s10533-003-0855-2 wos:000226519100002 scopus:84856505382 |
op_doi |
https://doi.org/10.1007/s10533-003-0855-2 |
container_title |
Biogeochemistry |
container_volume |
70 |
container_issue |
3 |
container_start_page |
315 |
op_container_end_page |
330 |
_version_ |
1766343942312296448 |