GrenonBradleyJonesEtAl2005

Référence

Grenon, F., Bradley, R.L., Jones, M.D., Shipley, B. and Peat, H. (2005) Soil factors controlling mineral N uptake by Picea engelmannii seedlings: The importance of gross NH4+ production rates. New Phytologist, 165(3):791-799.

Résumé

? Hydroponic studies suggest that plant nitrogen (N) demand determines the rate of mineral N uptake; however, field observations show N limitation to be widespread. Field experiments are needed to understand soil factors controlling mineral N uptake. ? We planted Picea engelmannii seedlings that had initially been grown from sterilized seeds, on a recently clearcut site. We applied a hybrid isotope dilution/pulse labelling technique to compare the gross production rate, concomitantly to the plant uptake rate, of soil mineral N. We also measured mineral N concentrations, microbial N, and percent ectomycorrhizal root tips. ? Gross NH4+ production rate was the most important determinant of plant uptake rate. Exploratory path analysis suggested that plant uptake was also determined by microbial N, which was, in turn, determined by soil mineral N concentrations. Percent ectomycorrhizal root tips was negatively related to gross NO3- production rate and microbial N concentrations. ? We conclude that nutrient flux density is important in controlling plant uptake. Mycorrhizal colonization may alter N dynamics in the rhizosphere without affecting mineral N uptake by seedlings. © New Phytologist (2004).

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@ARTICLE { GrenonBradleyJonesEtAl2005,
    AUTHOR = { Grenon, F. and Bradley, R.L. and Jones, M.D. and Shipley, B. and Peat, H. },
    TITLE = { Soil factors controlling mineral N uptake by Picea engelmannii seedlings: The importance of gross NH4+ production rates },
    JOURNAL = { New Phytologist },
    YEAR = { 2005 },
    VOLUME = { 165 },
    PAGES = { 791-799 },
    NUMBER = { 3 },
    NOTE = { 0028646X (ISSN) Cited By (since 1996): 1 Export Date: 26 April 2007 Source: Scopus CODEN: NEPHA doi: 10.1111/j.1469-8137.2004.01289.x Language of Original Document: English Correspondence Address: Bradley, R.L.; De?partement de Biologie; Universite? de Sherbrooke Sherbrooke, Que. J1K 2R1, Canada; email: Robert.Bradley@Usherbrooke.ca Chemicals/CAS: nitrate, 14797-55-8; nitrogen, 7727-37-9; Ammonium Compounds; Minerals; Nitrates; Nitrogen, 7727-37-9 References: Bending, G.D., Litter decomposiiton, ectomycorrhizal roots and the 'Gadgil' effect (2003) New Phytologist, 158, pp. 228-229; Bradley, R.L., Fyles, J.W., Growth of paper birch (Betula papyrifera) seedlings increases soil available C and microbial acquisition of soil nutrients (1995) Soil Biology and Biochemistry, 27, pp. 1565-1571; Bradley, R.L., Fyles, J.W., Method to avoid isotope discrimination during the diffusion of NH 4+ from 15N-labelled soil extracts (1996) Soil Biology and Biochemistry, 28, pp. 695-697; Bradley, R.L., Titus, B.D., Fyles, J.W., Nitrogen acquisition and competitive ability of Kalmia angustifolia L., paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) 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    ABSTRACT = { ? Hydroponic studies suggest that plant nitrogen (N) demand determines the rate of mineral N uptake; however, field observations show N limitation to be widespread. Field experiments are needed to understand soil factors controlling mineral N uptake. ? We planted Picea engelmannii seedlings that had initially been grown from sterilized seeds, on a recently clearcut site. We applied a hybrid isotope dilution/pulse labelling technique to compare the gross production rate, concomitantly to the plant uptake rate, of soil mineral N. We also measured mineral N concentrations, microbial N, and percent ectomycorrhizal root tips. ? Gross NH4+ production rate was the most important determinant of plant uptake rate. Exploratory path analysis suggested that plant uptake was also determined by microbial N, which was, in turn, determined by soil mineral N concentrations. Percent ectomycorrhizal root tips was negatively related to gross NO3- production rate and microbial N concentrations. ? We conclude that nutrient flux density is important in controlling plant uptake. Mycorrhizal colonization may alter N dynamics in the rhizosphere without affecting mineral N uptake by seedlings. © New Phytologist (2004). },
    KEYWORDS = { Ectomycorrhizal density Exploratory path analysis Gross mineral N production rate Microbial N Mineral N uptake Picea engelmannii (engelmann spruce) ammonium ectomycorrhiza nitrogen nutrient uptake soil property Picea Picea engelmannii },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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