Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use
Abstract Background The repeated freeze-thaw events during cold season, freezing of soils in autumn and thawing in spring are typical for the tundra, boreal, and temperate soils. The thawing of soils during winter-summer transitions induces the release of decomposable organic carbon and acceleration...
Main Authors: | , , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
BioMed Central Ltd.
2007
|
Subjects: | |
Online Access: | http://www.cbmjournal.com/content/2/1/2 |
id |
ftbiomed:oai:biomedcentral.com:1750-0680-2-2 |
---|---|
record_format |
openpolar |
spelling |
ftbiomed:oai:biomedcentral.com:1750-0680-2-2 2023-05-15T18:40:45+02:00 Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use Kurganova, Irina Teepe, Robert Loftfield, Norman 2007-02-19 http://www.cbmjournal.com/content/2/1/2 en eng BioMed Central Ltd. http://www.cbmjournal.com/content/2/1/2 Copyright 2007 Kurganova et al; licensee BioMed Central Ltd. Research 2007 ftbiomed 2007-11-11T15:26:52Z Abstract Background The repeated freeze-thaw events during cold season, freezing of soils in autumn and thawing in spring are typical for the tundra, boreal, and temperate soils. The thawing of soils during winter-summer transitions induces the release of decomposable organic carbon and acceleration of soil respiration. The winter-spring fluxes of CO 2 from permanently and seasonally frozen soils are essential part of annual carbon budget varying from 5 to 50%. The mechanisms of the freeze-thaw activation are not absolutely clear and need clarifying. We investigated the effect of repeated freezing-thawing events on CO 2 emission from intact arable and forest soils (Luvisols, loamy silt; Central Germany) at different moisture (65% and 100% of WHC). Results Due to the measurement of the CO 2 flux in two hours intervals, the dynamics of CO 2 emission during freezing-thawing events was described in a detailed way. At +10°C (initial level) in soils investigated, carbon dioxide emission varied between 7.4 to 43.8 mg C m -2 h -1 depending on land use and moisture. CO 2 flux from the totally frozen soil never reached zero and amounted to 5 to 20% of the initial level, indicating that microbial community was still active at -5°C. Significant burst of CO 2 emission (1.2–1.7-fold increase depending on moisture and land use) was observed during thawing. There was close linear correlation between CO 2 emission and soil temperature (R 2 = 0.86–0.97, P < 0.001). Conclusion Our investigations showed that soil moisture and land use governed the initial rate of soil respiration, duration of freezing and thawing of soil, pattern of CO 2 dynamics and extra CO 2 fluxes. As a rule, the emissions of CO 2 induced by freezing-thawing were more significant in dry soils and during the first freezing-thawing cycle (FTC). The acceleration of CO 2 emission was caused by different processes: the liberation of nutrients upon the soil freezing, biological activity occurring in unfrozen water films, and respiration of cold-adapted microflora. Other/Unknown Material Tundra BioMed Central |
institution |
Open Polar |
collection |
BioMed Central |
op_collection_id |
ftbiomed |
language |
English |
description |
Abstract Background The repeated freeze-thaw events during cold season, freezing of soils in autumn and thawing in spring are typical for the tundra, boreal, and temperate soils. The thawing of soils during winter-summer transitions induces the release of decomposable organic carbon and acceleration of soil respiration. The winter-spring fluxes of CO 2 from permanently and seasonally frozen soils are essential part of annual carbon budget varying from 5 to 50%. The mechanisms of the freeze-thaw activation are not absolutely clear and need clarifying. We investigated the effect of repeated freezing-thawing events on CO 2 emission from intact arable and forest soils (Luvisols, loamy silt; Central Germany) at different moisture (65% and 100% of WHC). Results Due to the measurement of the CO 2 flux in two hours intervals, the dynamics of CO 2 emission during freezing-thawing events was described in a detailed way. At +10°C (initial level) in soils investigated, carbon dioxide emission varied between 7.4 to 43.8 mg C m -2 h -1 depending on land use and moisture. CO 2 flux from the totally frozen soil never reached zero and amounted to 5 to 20% of the initial level, indicating that microbial community was still active at -5°C. Significant burst of CO 2 emission (1.2–1.7-fold increase depending on moisture and land use) was observed during thawing. There was close linear correlation between CO 2 emission and soil temperature (R 2 = 0.86–0.97, P < 0.001). Conclusion Our investigations showed that soil moisture and land use governed the initial rate of soil respiration, duration of freezing and thawing of soil, pattern of CO 2 dynamics and extra CO 2 fluxes. As a rule, the emissions of CO 2 induced by freezing-thawing were more significant in dry soils and during the first freezing-thawing cycle (FTC). The acceleration of CO 2 emission was caused by different processes: the liberation of nutrients upon the soil freezing, biological activity occurring in unfrozen water films, and respiration of cold-adapted microflora. |
format |
Other/Unknown Material |
author |
Kurganova, Irina Teepe, Robert Loftfield, Norman |
spellingShingle |
Kurganova, Irina Teepe, Robert Loftfield, Norman Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
author_facet |
Kurganova, Irina Teepe, Robert Loftfield, Norman |
author_sort |
Kurganova, Irina |
title |
Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
title_short |
Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
title_full |
Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
title_fullStr |
Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
title_full_unstemmed |
Influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
title_sort |
influence of freeze-thaw events on carbon dioxide emission from soils at different moisture and land use |
publisher |
BioMed Central Ltd. |
publishDate |
2007 |
url |
http://www.cbmjournal.com/content/2/1/2 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
http://www.cbmjournal.com/content/2/1/2 |
op_rights |
Copyright 2007 Kurganova et al; licensee BioMed Central Ltd. |
_version_ |
1766230176859947008 |