FrechetteEnsmingerBergeronEtAl2011

Référence

Frechette, E., Ensminger, I., Bergeron, Y., Gessler, A., Berninger, F. (2011) Will changes in root-zone temperature in boreal spring affect recoveryof photosynthesis in Picea mariana and Populus tremuloides in a futureclimate? Tree Physiology, 31(11):1204-1216. (URL )

Résumé

Future climate will alter the soil cover of mosses and snow depthsin the boreal forests of eastern Canada. In field manipulation experiments,we assessed the effects of varying moss and snow depths on the physiologyof black spruce (Picea mariana (Mill.) B.S.P.) and trembling aspen(Populus tremuloides Michx.) in the boreal black spruce forest ofwestern Québec. For 1 year, naturally regenerated 10-year-old spruceand aspen were grown with one of the following treatments: additionalN fertilization, addition of sphagnum moss cover, removal of mosses,delayed soil thawing through snow and hay addition, or acceleratedsoil thawing through springtime snow removal. Treatments that involvedthe addition of insulating moss or snow in the spring caused lowersoil temperature, while removing moss and snow in the spring causedelevated soil temperature and thus had a warming effect. Soil warmingtreatments were associated with greater temperature variability.Additional soil cover, whether moss or snow, increased the rate ofphotosynthetic recovery in the spring. Moss and snow removal, onthe other hand, had the opposite effect and lowered photosyntheticactivity, especially in spruce. Maximal electron transport rate (ETRmax)was, for spruce, 39.5% lower after moss removal than with moss addition,and 16.3% lower with accelerated thawing than with delayed thawing.Impaired photosynthetic recovery in the absence of insulating mossor snow covers was associated with lower foliar N concentrations.Both species were affected in that way, but trembling aspen generallyreacted less strongly to all treatments. Our results indicate thata clear negative response of black spruce to changes in root-zonetemperature should be anticipated in a future climate. Reduced mosscover and snow depth could adversely affect the photosynthetic capacitiesof black spruce, while having only minor effects on trembling aspen.

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@ARTICLE { FrechetteEnsmingerBergeronEtAl2011,
    AUTHOR = { Frechette, E. and Ensminger, I. and Bergeron, Y. and Gessler, A.and Berninger, F. },
    TITLE = { Will changes in root-zone temperature in boreal spring affect recoveryof photosynthesis in Picea mariana and Populus tremuloides in a futureclimate? },
    JOURNAL = { Tree Physiology },
    YEAR = { 2011 },
    VOLUME = { 31 },
    PAGES = { 1204-1216 },
    NUMBER = { 11 },
    ABSTRACT = { Future climate will alter the soil cover of mosses and snow depthsin the boreal forests of eastern Canada. In field manipulation experiments,we assessed the effects of varying moss and snow depths on the physiologyof black spruce (Picea mariana (Mill.) B.S.P.) and trembling aspen(Populus tremuloides Michx.) in the boreal black spruce forest ofwestern Québec. For 1 year, naturally regenerated 10-year-old spruceand aspen were grown with one of the following treatments: additionalN fertilization, addition of sphagnum moss cover, removal of mosses,delayed soil thawing through snow and hay addition, or acceleratedsoil thawing through springtime snow removal. Treatments that involvedthe addition of insulating moss or snow in the spring caused lowersoil temperature, while removing moss and snow in the spring causedelevated soil temperature and thus had a warming effect. Soil warmingtreatments were associated with greater temperature variability.Additional soil cover, whether moss or snow, increased the rate ofphotosynthetic recovery in the spring. Moss and snow removal, onthe other hand, had the opposite effect and lowered photosyntheticactivity, especially in spruce. Maximal electron transport rate (ETRmax)was, for spruce, 39.5% lower after moss removal than with moss addition,and 16.3% lower with accelerated thawing than with delayed thawing.Impaired photosynthetic recovery in the absence of insulating mossor snow covers was associated with lower foliar N concentrations.Both species were affected in that way, but trembling aspen generallyreacted less strongly to all treatments. Our results indicate thata clear negative response of black spruce to changes in root-zonetemperature should be anticipated in a future climate. Reduced mosscover and snow depth could adversely affect the photosynthetic capacitiesof black spruce, while having only minor effects on trembling aspen. },
    DOI = { 10.1093/treephys/tpr102 },
    OWNER = { amriv2 },
    TIMESTAMP = { 2012.09.11 },
    URL = { http://treephys.oxfordjournals.org/content/31/11/1204.abstract },
}

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