LaganiereAngersPareEtAl2011
Référence
Laganiere, J., Angers, V.-A., Pare, D., Bergeron, Y., Chen, H.Y.H. (2011) Black spruce soils accumulate more uncomplexed organic matter thanaspen soils. Soil Science Society of America Journal, 75(3):1125-1132. (Scopus 
)
Résumé
Improving knowledge on the dynamics and maintenance of the borealsoil's C pool is of particular importance in response to climatechange concerns. We hypothesized that different forest types (blackspruce, trembling aspen, and mixedwood) found on a similar site typedifferentially aff ect soil organic carbon (SOC) distribution amongphysical fractions. The surface mineral soil (0-15 cm) of 24 plotsdiff ering in forest composition was sampled in forested Hapludalfsof the Abitibi-James Bay region, Canada. The soil was first separatedinto three water-stable aggregate size fractions (>1000, 1000-250,and <250 µm) by wet sieving, followed by a density flotation(NaI: 1.7 g cm-3) and a dispersion (with glass beads) to isolatethe free light fraction (LF), the intraaggregate particulate organicmatter (iPOM) and the silt plus clay fraction (S&C). Accordingto mixed linear models, whole SOC contents (in Mg C ha-1) decreasedin the following order: black spruce (46.3) > mixedwood (41.9)> trembling aspen (34.7). While similar amounts of SOC (~30Mg C ha-1) were found in the S&C, more SOC was found in the lessprotected fractions (i.e., uncomplexed organic matter, UOM: LF andiPOM) under black spruce than under trembling aspen, the mixedwoodbeing intermediate. Th is higher accumulation of UOM under blackspruce suggests a slower C turnover that is probably induced by thelow-quality C inputs and environmental constraints to decompositionfound in these forests. These diff erences in the amounts of SOCstored within soil physical fractions might have strong repercussionson the SOC budget of the boreal forest of eastern Canada under climatechange. © Soil Science Society of America.
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@ARTICLE { LaganiereAngersPareEtAl2011,
AUTHOR = { Laganiere, J. and Angers, V.-A. and Pare, D. and Bergeron, Y. andChen, H.Y.H. },
TITLE = { Black spruce soils accumulate more uncomplexed organic matter thanaspen soils },
JOURNAL = { Soil Science Society of America Journal },
YEAR = { 2011 },
VOLUME = { 75 },
PAGES = { 1125-1132 },
NUMBER = { 3 },
ABSTRACT = { Improving knowledge on the dynamics and maintenance of the borealsoil's C pool is of particular importance in response to climatechange concerns. We hypothesized that different forest types (blackspruce, trembling aspen, and mixedwood) found on a similar site typedifferentially aff ect soil organic carbon (SOC) distribution amongphysical fractions. The surface mineral soil (0-15 cm) of 24 plotsdiff ering in forest composition was sampled in forested Hapludalfsof the Abitibi-James Bay region, Canada. The soil was first separatedinto three water-stable aggregate size fractions (>1000, 1000-250,and <250 µm) by wet sieving, followed by a density flotation(NaI: 1.7 g cm-3) and a dispersion (with glass beads) to isolatethe free light fraction (LF), the intraaggregate particulate organicmatter (iPOM) and the silt plus clay fraction (S&C). Accordingto mixed linear models, whole SOC contents (in Mg C ha-1) decreasedin the following order: black spruce (46.3) > mixedwood (41.9)> trembling aspen (34.7). While similar amounts of SOC (~30Mg C ha-1) were found in the S&C, more SOC was found in the lessprotected fractions (i.e., uncomplexed organic matter, UOM: LF andiPOM) under black spruce than under trembling aspen, the mixedwoodbeing intermediate. Th is higher accumulation of UOM under blackspruce suggests a slower C turnover that is probably induced by thelow-quality C inputs and environmental constraints to decompositionfound in these forests. These diff erences in the amounts of SOCstored within soil physical fractions might have strong repercussionson the SOC budget of the boreal forest of eastern Canada under climatechange. © Soil Science Society of America. },
COMMENT = { Export Date: 9 January 2012Source: ScopusCODEN: SSSJDdoi: 10.2136/sssaj2010.0275 },
ISSN = { 03615995 (ISSN) },
OWNER = { Luc },
TIMESTAMP = { 2012.01.09 },
URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-83055178408&partnerID=40&md5=5e839c4b5dd4348d2dfdaa89ab060846 },
}
