BradleyTitusFyles1997

Référence

Bradley, R.L., Titus, B.D., Fyles, J.W. (1997) Nitrogen acquisition and competitive ability of Kalmia angustifolia L., paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.) seedlings grown on different humus forms. Plant and Soil, 195(2):209-220.

Résumé

Two species of boreal tree seedlings, paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.), and the ericaceous shrub Kalmia angustifolia L. were grown in posts with humus from a birch-dominated site and two spruce-Kalmia sites. Root systems interacted with humus form in controlling soil-N cycling as well as energy and nutritional deficiencies of soil microorganisms. In general, Kalmia seedlings affected microbial dynamics and N cycling differently than birch and spruce seedlings did. Birch and spruce seedlings reduced gross N mineralization and immobilization rates, soil mineral-N pools and the amounts of NH4/+-N accreted on buried cation exchange resins in all three soils. Compared to birch and spruce seedlings, the growth of Kalmia resulted in significantly higher gross N mineralization rates, soil mineral-N pools and resin-NH4/+-N accretion in soil from the fertile birch site. Gross N immobilization rates in soils were generally higher with Kalmia than with spruce or birch seedlings. All three species of seedling acquired N from the birch site soil, whereas only Kalmia seedlings acquired N from the two spruce-Kalmia site soils. Relative to control treatments, the amount of N mineralized anaerobically increased in the birch-site soil and decreased in the poor spruce-Kalmia site soil with all three species of seedlings. All seedlings increased the microbial biomass in the birch-site soil. Kalmia humus and Kalmia root systems increased microbial energy-deficiency and decreased microbial nutritional deficiency compared to the other humus and seedlings used. Results are discussed in terms of each species' nutrient acquisition mechanism and its competitive ability during secondary succession.

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@ARTICLE { BradleyTitusFyles1997,
    AUTHOR = { Bradley, R.L. and Titus, B.D. and Fyles, J.W. },
    TITLE = { Nitrogen acquisition and competitive ability of Kalmia angustifolia L., paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.) seedlings grown on different humus forms },
    JOURNAL = { Plant and Soil },
    YEAR = { 1997 },
    VOLUME = { 195 },
    PAGES = { 209-220 },
    NUMBER = { 2 },
    NOTE = { 0032079X (ISSN) Cited By (since 1996): 19 Export Date: 26 April 2007 Source: Scopus CODEN: PLSOA doi: 10.1023/A:1004263716346 Language of Original Document: English Correspondence Address: Bradley, R.L.; Department of Forest Sciences; 270 - 2357 Main Mall; University of British Columbia Vancouver, BC V6T 1Z4, Canada; email: rbradley@unixg.ubc.ca References: Adams, M.A., Polglase, P.J., Attiwill, P.M., Weston, C.J., In situ studies of nitrogen mineralization and uptake in forest soils; some comments on methodology (1989) Soil Biol. Biochem., 21, pp. 423-429; Aerts, R., Berendse, F., Klerk, N.M., Bakker, C., Competition in heathland along an experimental gradient on nutrient availability (1990) Oikos, 57, pp. 310-318; (1987) The Canadian System of Soil Classification. 2nd Ed., 164p. , Agric. Can. Publ. 1646, Ottawa; Anderson, T.H., Domsch, K.H., A physiological method for the quantitative measurement of microbial biomass in soil (1978) Soil Biol. 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    ABSTRACT = { Two species of boreal tree seedlings, paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.), and the ericaceous shrub Kalmia angustifolia L. were grown in posts with humus from a birch-dominated site and two spruce-Kalmia sites. Root systems interacted with humus form in controlling soil-N cycling as well as energy and nutritional deficiencies of soil microorganisms. In general, Kalmia seedlings affected microbial dynamics and N cycling differently than birch and spruce seedlings did. Birch and spruce seedlings reduced gross N mineralization and immobilization rates, soil mineral-N pools and the amounts of NH4/+-N accreted on buried cation exchange resins in all three soils. Compared to birch and spruce seedlings, the growth of Kalmia resulted in significantly higher gross N mineralization rates, soil mineral-N pools and resin-NH4/+-N accretion in soil from the fertile birch site. Gross N immobilization rates in soils were generally higher with Kalmia than with spruce or birch seedlings. All three species of seedling acquired N from the birch site soil, whereas only Kalmia seedlings acquired N from the two spruce-Kalmia site soils. Relative to control treatments, the amount of N mineralized anaerobically increased in the birch-site soil and decreased in the poor spruce-Kalmia site soil with all three species of seedlings. All seedlings increased the microbial biomass in the birch-site soil. Kalmia humus and Kalmia root systems increased microbial energy-deficiency and decreased microbial nutritional deficiency compared to the other humus and seedlings used. Results are discussed in terms of each species' nutrient acquisition mechanism and its competitive ability during secondary succession. },
    KEYWORDS = { 15N isotope dilution Coreal forest Gross immobilization-mineralization rates Nutrient acquisition Soil-N cycling black spruce competitive ability humus nitrogen acquisition paper birch Betula papyrifera Kalmia angustifolia Picea mariana },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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