Winter respiratory activity in aspen woodland forest floor litter and soils
Identifieur interne : 004C99 ( Main/Exploration ); précédent : 004C98; suivant : 004D00Winter respiratory activity in aspen woodland forest floor litter and soils
Auteurs : D. S. Coxson [Canada] ; D. Parkinson [Canada]Source :
- Soil Biology and Biochemistry [ 0038-0717 ] ; 1987.
Abstract
Winter respiratory activity of aspen woodland litter layers and of the underlying Ah horizon from a southwestern Alberta site was examined, both under field conditions and over a matrix of defined lab conditions ranging from −6 to +18°C and from 0 to 300% water content by weight. Under freeze-thaw field conditions pronounced diurnal fluctuations in rates of CO2 evolution were apparent, from 100 to over 300mg CO2 m−2 h−1, whereas under snowpack, with isothermal conditions, rates remained near 150 mg CO2 m−2 h−1 At optimal moisture content (near 270%) rates of CO2 evolution ranged from 5 to 500 mg CO2 g−1 h−1, respectively, at temperatures from −6 to + 18°C, with marked respiratory declines evident at lower litter moisture contents. Predicted cumulative soil CO2 release during the winter period was estimated at 407–457 g CO2 m−2, depending upon whether the effects of post-thaw respiratory bursts were included, with over 75% of this activity occurring between 0 and −5°C. Thus, although over 60 freeze-thaw cycles were observed at the litter surface during the December to March period, most of the microbial activity occurred either at depths below the thaw line or during periods when the entire soil profile was frozen but protected from extreme low temperatures by surface snow cover. The magnitude of winter respiratory CO2 evolution, predicted from the modeling of lab respiratory rates on measured litter microclimate, was equivalent to nearly 60% of annual biomass input, a value that was in close agreement with mass loss data from earlier litterbag studies at the aspen site.
Url:
DOI: 10.1016/0038-0717(87)90125-8
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000376
- to stream Istex, to step Curation: 000376
- to stream Istex, to step Checkpoint: 002319
- to stream Main, to step Merge: 005698
- to stream Main, to step Curation: 004C99
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Winter respiratory activity in aspen woodland forest floor litter and soils</title><author><name sortKey="Coxson, D S" sort="Coxson, D S" uniqKey="Coxson D" first="D. S." last="Coxson">D. S. Coxson</name></author><author><name sortKey="Parkinson, D" sort="Parkinson, D" uniqKey="Parkinson D" first="D." last="Parkinson">D. Parkinson</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:7AF8A90BBB701B1B7E2FBB837AF9E03BCAC088BF</idno><date when="1987" year="1987">1987</date><idno type="doi">10.1016/0038-0717(87)90125-8</idno><idno type="url">https://api-v5.istex.fr/document/7AF8A90BBB701B1B7E2FBB837AF9E03BCAC088BF/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000376</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000376</idno><idno type="wicri:Area/Istex/Curation">000376</idno><idno type="wicri:Area/Istex/Checkpoint">002319</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">002319</idno><idno type="wicri:doubleKey">0038-0717:1987:Coxson D:winter:respiratory:activity</idno><idno type="wicri:Area/Main/Merge">005698</idno><idno type="wicri:Area/Main/Curation">004C99</idno><idno type="wicri:Area/Main/Exploration">004C99</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Winter respiratory activity in aspen woodland forest floor litter and soils</title><author><name sortKey="Coxson, D S" sort="Coxson, D S" uniqKey="Coxson D" first="D. S." last="Coxson">D. S. Coxson</name><affiliation wicri:level="4"><country>Canada</country><wicri:regionArea>Kananaskis Centre for Environmental Research, The University of Calgary, Calgary, Alberta</wicri:regionArea><orgName type="university">Université de Calgary</orgName><placeName><settlement type="city">Calgary</settlement><region type="state">Alberta</region></placeName></affiliation></author><author><name sortKey="Parkinson, D" sort="Parkinson, D" uniqKey="Parkinson D" first="D." last="Parkinson">D. Parkinson</name><affiliation wicri:level="4"><country>Canada</country><wicri:regionArea>Kananaskis Centre for Environmental Research, The University of Calgary, Calgary, Alberta</wicri:regionArea><orgName type="university">Université de Calgary</orgName><placeName><settlement type="city">Calgary</settlement><region type="state">Alberta</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Soil Biology and Biochemistry</title><title level="j" type="abbrev">SBB</title><idno type="ISSN">0038-0717</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1987">1987</date><biblScope unit="volume">19</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="49">49</biblScope><biblScope unit="page" to="59">59</biblScope></imprint><idno type="ISSN">0038-0717</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0038-0717</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Winter respiratory activity of aspen woodland litter layers and of the underlying Ah horizon from a southwestern Alberta site was examined, both under field conditions and over a matrix of defined lab conditions ranging from −6 to +18°C and from 0 to 300% water content by weight. Under freeze-thaw field conditions pronounced diurnal fluctuations in rates of CO2 evolution were apparent, from 100 to over 300mg CO2 m−2 h−1, whereas under snowpack, with isothermal conditions, rates remained near 150 mg CO2 m−2 h−1 At optimal moisture content (near 270%) rates of CO2 evolution ranged from 5 to 500 mg CO2 g−1 h−1, respectively, at temperatures from −6 to + 18°C, with marked respiratory declines evident at lower litter moisture contents. Predicted cumulative soil CO2 release during the winter period was estimated at 407–457 g CO2 m−2, depending upon whether the effects of post-thaw respiratory bursts were included, with over 75% of this activity occurring between 0 and −5°C. Thus, although over 60 freeze-thaw cycles were observed at the litter surface during the December to March period, most of the microbial activity occurred either at depths below the thaw line or during periods when the entire soil profile was frozen but protected from extreme low temperatures by surface snow cover. The magnitude of winter respiratory CO2 evolution, predicted from the modeling of lab respiratory rates on measured litter microclimate, was equivalent to nearly 60% of annual biomass input, a value that was in close agreement with mass loss data from earlier litterbag studies at the aspen site.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Alberta</li></region><settlement><li>Calgary</li></settlement><orgName><li>Université de Calgary</li></orgName></list><tree><country name="Canada"><region name="Alberta"><name sortKey="Coxson, D S" sort="Coxson, D S" uniqKey="Coxson D" first="D. S." last="Coxson">D. S. Coxson</name></region><name sortKey="Parkinson, D" sort="Parkinson, D" uniqKey="Parkinson D" first="D." last="Parkinson">D. Parkinson</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 004C99 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 004C99 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:7AF8A90BBB701B1B7E2FBB837AF9E03BCAC088BF
|texte= Winter respiratory activity in aspen woodland forest floor litter and soils
}}
| This area was generated with Dilib version V0.6.29. |  |