PaquinMargolisDoucetEtAl2000

Reference

Paquin, R., Margolis, H.A., Doucet, R., Coyea, M.R. (2000) Physiological responses of black spruce layers and planted seedlings to nutrient addition. Tree Physiology, 20(4):229-237.

Abstract

We investigated effects of nutrient addition on several physiological characteristics of 60-cm-tall black spruce (Picea mariana Mill. B.S.P.) layers (i.e., rooted branches of overstory trees) and 20-cm-tall planted seedlings on a clear-cut, N-limited boreal site. After two growing seasons, current-year and one-year-old needles of fertilized trees (layers and seedlings combined) had higher net photosynthetic rates (A(n)) and maximum capacity of Rubisco for CO2 fixation (V-max) than unfertilized trees. One-year-old needles of fertilized trees had higher stomatal conductance (g(s)), higher water-use efficiency, and lower intercellular to ambient CO2 ratio than unfertilized trees. Additionally, fertilized trees had higher predawn and midday shoot water potentials than unfertilized trees. Stomatal conductance of 1-year-old needles was 23% higher in seedlings than in layers, but there were no significant differences in g(s) of current-year needles between the regeneration types. For both needle age-classes, A(n) and V-max of layers were 25 and 40% higher, respectively, than the corresponding values for seedlings. The higher values of A(n), V-max and foliar N concentration of layers compared with seedlings after two growing seasons may be associated with the larger root systems of the layers compared with the transplanted seedlings.

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@ARTICLE { PaquinMargolisDoucetEtAl2000,
    AUTHOR = { Paquin, R. and Margolis, H.A. and Doucet, R. and Coyea, M.R. },
    TITLE = { Physiological responses of black spruce layers and planted seedlings to nutrient addition },
    JOURNAL = { Tree Physiology },
    YEAR = { 2000 },
    VOLUME = { 20 },
    PAGES = { 229-237 },
    NUMBER = { 4 },
    NOTE = { Times Cited: 3 },
    ABSTRACT = { We investigated effects of nutrient addition on several physiological characteristics of 60-cm-tall black spruce (Picea mariana Mill. B.S.P.) layers (i.e., rooted branches of overstory trees) and 20-cm-tall planted seedlings on a clear-cut, N-limited boreal site. After two growing seasons, current-year and one-year-old needles of fertilized trees (layers and seedlings combined) had higher net photosynthetic rates (A(n)) and maximum capacity of Rubisco for CO2 fixation (V-max) than unfertilized trees. One-year-old needles of fertilized trees had higher stomatal conductance (g(s)), higher water-use efficiency, and lower intercellular to ambient CO2 ratio than unfertilized trees. Additionally, fertilized trees had higher predawn and midday shoot water potentials than unfertilized trees. Stomatal conductance of 1-year-old needles was 23% higher in seedlings than in layers, but there were no significant differences in g(s) of current-year needles between the regeneration types. For both needle age-classes, A(n) and V-max of layers were 25 and 40% higher, respectively, than the corresponding values for seedlings. The higher values of A(n), V-max and foliar N concentration of layers compared with seedlings after two growing seasons may be associated with the larger root systems of the layers compared with the transplanted seedlings. },
    KEYWORDS = { fertilization; photosynthesis; Picea mariana; Rubisco capacity; stomatal conductance; water stress; water-use efficiency PICEA-MARIANA; ENVIRONMENTAL-FACTORS; STOMATAL CONDUCTANCE; WATER RELATIONS; BOREAL FOREST; PHOTOSYNTHESIS; GROWTH; PINE; TEMPERATURE; QUEBEC },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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