DelagrangeHucMessierEtAl2006

Référence

Delagrange, S., Huc, F., Messier, C., Dizengremel, P., Dreyer, E. (2006) In vivo and in situ rhizosphere respiration in Acer saccharum and Betula alleghaniensis seedlings grown in contrasting light regimes. Tree Physiology, 26(7):925-934. (Scopus )

Résumé

A perfusive method combined with an open-system carbon dioxide measurement system was used to assess rhizosphere respiration of Acer saccharum Marsh. (sugar maple) and Betula alleghaniensis Britton (yellow birch) seedlings grown in 8-1 pots filled with coarse sand. We compared in vivo and in situ rhizosphere respiration between species, among light regimes (40, 17 and 6% of full daylight) and at different times during the day. To compute specific rhizosphere respiration, temperature corrections were made with either species-specific coefficients (Q<sub>10</sub>) based on the observed change in respiration rate between 15 and 21°C or an arbitrarily assigned Q<sub>10</sub> of 2. Estimated, species-specific Q<sub>10</sub> values were 3.0 and 3.4 for A. saccharum and B. alleghaniensis, respectively, and did not vary with light regime. Using either method of temperature correction, specific rhizosphere respiration did not differ either between A. saccharum and B. alleghaniensis, or among light regimes except in A. saccharum at 6% of full daylight. At this irradiance, seedlings were smaller than in the other light treatments, with a larger fine root fraction of total root dry mass, resulting in higher respiration rates. Specific rhizosphere respiration was significantly higher during the afternoon than at other times of day when temperature-corrected on the basis of an arbitrary Q<sub>10</sub> of 2, suggesting the possibility of diurnal variation in a temperature-independent component of rhizosphere respiration. © 2006 Heron Publishing.

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@ARTICLE { DelagrangeHucMessierEtAl2006,
    AUTHOR = { Delagrange, S. and Huc, F. and Messier, C. and Dizengremel, P. and Dreyer, E. },
    TITLE = { In vivo and in situ rhizosphere respiration in Acer saccharum and Betula alleghaniensis seedlings grown in contrasting light regimes },
    JOURNAL = { Tree Physiology },
    YEAR = { 2006 },
    VOLUME = { 26 },
    PAGES = { 925-934 },
    NUMBER = { 7 },
    ABSTRACT = { A perfusive method combined with an open-system carbon dioxide measurement system was used to assess rhizosphere respiration of Acer saccharum Marsh. (sugar maple) and Betula alleghaniensis Britton (yellow birch) seedlings grown in 8-1 pots filled with coarse sand. We compared in vivo and in situ rhizosphere respiration between species, among light regimes (40, 17 and 6% of full daylight) and at different times during the day. To compute specific rhizosphere respiration, temperature corrections were made with either species-specific coefficients (Q<sub>10</sub>) based on the observed change in respiration rate between 15 and 21°C or an arbitrarily assigned Q<sub>10</sub> of 2. Estimated, species-specific Q<sub>10</sub> values were 3.0 and 3.4 for A. saccharum and B. alleghaniensis, respectively, and did not vary with light regime. Using either method of temperature correction, specific rhizosphere respiration did not differ either between A. saccharum and B. alleghaniensis, or among light regimes except in A. saccharum at 6% of full daylight. At this irradiance, seedlings were smaller than in the other light treatments, with a larger fine root fraction of total root dry mass, resulting in higher respiration rates. Specific rhizosphere respiration was significantly higher during the afternoon than at other times of day when temperature-corrected on the basis of an arbitrary Q<sub>10</sub> of 2, suggesting the possibility of diurnal variation in a temperature-independent component of rhizosphere respiration. © 2006 Heron Publishing. },
    COMMENT = { Export Date: 10 February 2010 Source: Scopus CODEN: TRPHE },
    ISSN = { 0829318X (ISSN) },
    KEYWORDS = { Circadian variations, Fine roots, Open gas chamber, Q<sub>10</sub>, Root, Sugar maple, Temperature, Yellow birch, carbon dioxide, comparative study, deciduous tree, diurnal variation, in situ measurement, irradiance, light availability, respiration, rhizosphere, seedling, temperature effect, Acer, article, birch, circadian rhythm, comparative study, growth, development and aging, light, metabolism, plant leaf, plant root, seedling, soil, temperature, Acer, Betula, Carbon Dioxide, Circadian Rhythm, Light, Plant Leaves, Plant Roots, Seedling, Soil, Temperature, Acer, Acer saccharum, Betula alleghaniensis },
    OWNER = { Luc },
    TIMESTAMP = { 2010.02.10 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-33746855587&partnerID=40&md5=39b0ed116990edf9dd060a6c154ea579 },
}

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