DesRochersLandhausserLieffers2002

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DesRochers, A., Landhausser, S.M. and Lieffers, V.J. (2002) Coarse and fine root respiration in aspen (Populus tremuloides). Tree Physiology, 22(10):725-732.

Résumé

Coarse and fine root respiration rates of aspen (Populus tremuloides Michx.) were measured at 5, 15 and 25°C. Coarse roots ranged from 0.65 to 4.45 cm in diameter, whereas fine roots were less than 5 mm in diameter. To discriminate between maintenance and growth respiration, root respiration rates were measured during aboveground growing periods and dormant periods. An additional measurement of coarse root respiration was made during spring leaf flush, to evaluate the effect of mobilization of resources for leaf expansion on root respiration. Fine roots respired at much higher rates than coarse roots, with a mean rate at 15°C of 1290 ?mol CO2 m-3 s-1 during the growing period, and 660 ?mol CO2 m-3 s-1 during the dormant period. The temperature response of fine root respiration rate was nonlinear: mean Q10 was 3.90 for measurements made at 5-15°C and 2.19 for measurements made at 15-25°C. Coarse root respiration rates measured at 15°C in late fall (dormant season) were higher (370 ?mol CO2 m-3 s-1) than rates from roots collected at leaf flush and early summer (200 ?mol CO2 m-3 s-1). The higher respiration rates in late fall, which were accompanied by decreased total nonstructural carbohydrate (TNC) concentrations, suggest that respiration rates in late fall included growth expenditures, reflecting recent radial growth. Neither bud flush nor shoot growth of the trees caused an increase in coarse root respiration or a decrease in TNC concentrations, suggesting a limited role of coarse roots as reserve storage organs for spring shoot growth, and a lack of synchronization between above- and belowground growth. Pooling the data from the coarse and fine roots showed a positive correlation between nitrogen concentration and respiration rate.

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@ARTICLE { DesRochersLandhausserLieffers2002,
    AUTHOR = { DesRochers, A. and Landhausser, S.M. and Lieffers, V.J. },
    TITLE = { Coarse and fine root respiration in aspen (Populus tremuloides) },
    JOURNAL = { Tree Physiology },
    YEAR = { 2002 },
    VOLUME = { 22 },
    PAGES = { 725-732 },
    NUMBER = { 10 },
    NOTE = { 0829318X (ISSN) Cited By (since 1996): 12 Export Date: 27 April 2007 Source: Scopus CODEN: TRPHE Language of Original Document: English Correspondence Address: Desrochers, A.; Centre of Enhanced Forest Management; Department of Renewable Resources; University of Alberta Edmonton, Alta. T6G 2E3, Canada; email: desrocan@alpac.ca References: Amthor, J.S., The role of maintenance respiration in plant growth (1984) Plant Cell Environ., 7, pp. 561-569; Beckingham, J.D., Archibald, J.H., (1996) Field guide to ecosites of northern Alberta, , Special Report 5, Canadian Forest Service, Northwest Region, Northern Forestry Centre, Edmonton, AB, 515 p; Bowser, W.E., Kjearsgaard, A.A., Peters, T.W., Wells, R.E., (1962) Soil survey of Edmonton (83-H), , Alberta Soil Survey Report No. 21, Univ. Alberta (Bull. 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    ABSTRACT = { Coarse and fine root respiration rates of aspen (Populus tremuloides Michx.) were measured at 5, 15 and 25°C. Coarse roots ranged from 0.65 to 4.45 cm in diameter, whereas fine roots were less than 5 mm in diameter. To discriminate between maintenance and growth respiration, root respiration rates were measured during aboveground growing periods and dormant periods. An additional measurement of coarse root respiration was made during spring leaf flush, to evaluate the effect of mobilization of resources for leaf expansion on root respiration. Fine roots respired at much higher rates than coarse roots, with a mean rate at 15°C of 1290 ?mol CO2 m-3 s-1 during the growing period, and 660 ?mol CO2 m-3 s-1 during the dormant period. The temperature response of fine root respiration rate was nonlinear: mean Q10 was 3.90 for measurements made at 5-15°C and 2.19 for measurements made at 15-25°C. Coarse root respiration rates measured at 15°C in late fall (dormant season) were higher (370 ?mol CO2 m-3 s-1) than rates from roots collected at leaf flush and early summer (200 ?mol CO2 m-3 s-1). The higher respiration rates in late fall, which were accompanied by decreased total nonstructural carbohydrate (TNC) concentrations, suggest that respiration rates in late fall included growth expenditures, reflecting recent radial growth. Neither bud flush nor shoot growth of the trees caused an increase in coarse root respiration or a decrease in TNC concentrations, suggesting a limited role of coarse roots as reserve storage organs for spring shoot growth, and a lack of synchronization between above- and belowground growth. Pooling the data from the coarse and fine roots showed a positive correlation between nitrogen concentration and respiration rate. },
    KEYWORDS = { Carbon CO2 Maintenance respiration Nonstructural carbohydrates Q10 Temperature response belowground production respiration root system Populus tremuloides },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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