LandhausserDesRochersLieffers2001

Référence

Landhausser, S.M., DesRochers, A. and Lieffers, V.J. (2001) A comparison of growth and physiology in Picea glauca and Populus tremuloides at different soil temperatures. Canadian Journal of Forest Research, 31(11):1922-1929.

Résumé

Trembling aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) seedlings were grown at uniform air temperatures but different soil temperatures (5, 15, and 25°C), and gas-exchange and growth characteristics were examined during active growth and early dormancy. At 5°C, Populus tremuloides had no root growth and limited growth in leaf area and shoot mass compared with the large increases in leaf and shoot mass at 25°C. In contrast, Picea glauca had some root growth at 5°C and moderate growth of roots at 15 and 25°C; however, there were no differences in aboveground mass at the different soil temperatures. Net assimilation and stomatal conductance in Populus tremuloides were reduced with decreasing soil temperatures, while in Picea glauca soil temperatures did not affect these gas-exchange variables. In both species, root mass was higher in the dormant period than during the growing period, while root volume remained constant. Generally, the growth variables of Populus tremuloides were more suppressed by cold soils than in Picea glauca. Root total nonstructural carbohydrates (TNC) decreased between the active growth and dormancy period by nearly 50% in Populus tremuloides, while there was no change in TNC in Picea glauca. Results suggest a more conservative use of TNC reserves in Picea glauca combined with a tolerance to cold soil temperatures compared with Populus tremuloides.

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@ARTICLE { LandhausserDesRochersLieffers2001,
    AUTHOR = { Landhausser, S.M. and DesRochers, A. and Lieffers, V.J. },
    TITLE = { A comparison of growth and physiology in Picea glauca and Populus tremuloides at different soil temperatures },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 2001 },
    VOLUME = { 31 },
    PAGES = { 1922-1929 },
    NUMBER = { 11 },
    NOTE = { 00455067 (ISSN) Cited By (since 1996): 25 Export Date: 27 April 2007 Source: Scopus CODEN: CJFRA doi: 10.1139/cjfr-31-11-1922 Language of Original Document: English Correspondence Address: Landha?usser, S.M.; Centre of Enhanced Forest Management; Department of Renewable Resources; University of Alberta Edmonton, Alta. T6G 2E3, Canada; email: simon.landhausser@ualberta.ca References: Amacher, M.C., Johnson, A.D., Kutterer, D.E., Bartos, D.L., First-year postfire and postharvest soil temperatures in aspen and conifer stands (2001) USDA Forest Serv. Res. 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    ABSTRACT = { Trembling aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) seedlings were grown at uniform air temperatures but different soil temperatures (5, 15, and 25°C), and gas-exchange and growth characteristics were examined during active growth and early dormancy. At 5°C, Populus tremuloides had no root growth and limited growth in leaf area and shoot mass compared with the large increases in leaf and shoot mass at 25°C. In contrast, Picea glauca had some root growth at 5°C and moderate growth of roots at 15 and 25°C; however, there were no differences in aboveground mass at the different soil temperatures. Net assimilation and stomatal conductance in Populus tremuloides were reduced with decreasing soil temperatures, while in Picea glauca soil temperatures did not affect these gas-exchange variables. In both species, root mass was higher in the dormant period than during the growing period, while root volume remained constant. Generally, the growth variables of Populus tremuloides were more suppressed by cold soils than in Picea glauca. Root total nonstructural carbohydrates (TNC) decreased between the active growth and dormancy period by nearly 50% in Populus tremuloides, while there was no change in TNC in Picea glauca. Results suggest a more conservative use of TNC reserves in Picea glauca combined with a tolerance to cold soil temperatures compared with Populus tremuloides. },
    KEYWORDS = { Carbohydrates Cultivation Soils Thermal effects Dormant periods Forestry growth leaf area physiology root system soil temperature Picea glauca Populus tremuloides },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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