BradleyParsons2007

Référence

Bradley, R.L., Parsons, W.F.J. (2007) Net and gross mineral N production rates at three levels of forest canopy retention: Evidence that NH4+ and NO3- dynamics are uncoupled. Biology and Fertility of Soils, 43(5):599-602.

Résumé

Alternative silvicultural systems were introduced in Coastal Western Hemlock forests of British Columbia, Canada, to reduce disturbance incurred by conventional clear-cutting and to maintain the forest influence on soil nutrient cycling. As we hypothesized, in situ pools and net mineralization of NH 4+ were lower under no and low disturbance (old-growth forest and shelterwood) compared to clear-cuts (high disturbance); in situ pools and net production of NO3- were very low across all treatments. Gross transformation rates of NH4+ increased while those of NO3- decreased with increasing disturbance, suggesting that these processes were uncoupled. We conclude that shelterwood harvesting reduces the impact on forest floor NH4+ cycling compared to clear-cutting, and that neither low nor high disturbance intensity results in substantial NO3- accumulation, as what occasionally occurs in other ecosystems. We hypothesize that the uncoupling of NH4+ and NO3- dynamics may be due to the predominance of heterotrophic nitrification by lignin-degrading fungi that oxidize organic N rather than NH4+-N, and whose activities are suppressed at high NH4+ concentrations. © 2006 Springer-Verlag.

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@ARTICLE { BradleyParsons2007,
    AUTHOR = { Bradley, R.L. and Parsons, W.F.J. },
    TITLE = { Net and gross mineral N production rates at three levels of forest canopy retention: Evidence that NH4+ and NO3- dynamics are uncoupled },
    JOURNAL = { Biology and Fertility of Soils },
    YEAR = { 2007 },
    VOLUME = { 43 },
    PAGES = { 599-602 },
    NUMBER = { 5 },
    ABSTRACT = { Alternative silvicultural systems were introduced in Coastal Western Hemlock forests of British Columbia, Canada, to reduce disturbance incurred by conventional clear-cutting and to maintain the forest influence on soil nutrient cycling. As we hypothesized, in situ pools and net mineralization of NH 4+ were lower under no and low disturbance (old-growth forest and shelterwood) compared to clear-cuts (high disturbance); in situ pools and net production of NO3- were very low across all treatments. Gross transformation rates of NH4+ increased while those of NO3- decreased with increasing disturbance, suggesting that these processes were uncoupled. We conclude that shelterwood harvesting reduces the impact on forest floor NH4+ cycling compared to clear-cutting, and that neither low nor high disturbance intensity results in substantial NO3- accumulation, as what occasionally occurs in other ecosystems. We hypothesize that the uncoupling of NH4+ and NO3- dynamics may be due to the predominance of heterotrophic nitrification by lignin-degrading fungi that oxidize organic N rather than NH4+-N, and whose activities are suppressed at high NH4+ concentrations. © 2006 Springer-Verlag. },
    ADDRESS = { De?partement de Biologie, Universite? de Sherbrooke, Sherbrooke, Que. J1K2R1, Canada },
    COMMENT = { Export Date: 24 August 2007 Source: Scopus CODEN: BFSOE doi: 10.1007/s00374-006-0138-x Language of Original Document: English Correspondence Address: Bradley, R.L.; De?partement de Biologie; Universite? de Sherbrooke Sherbrooke, Que. J1K2R1, Canada; email: Robert.Bradley@USherbrooke.ca },
    ISSN = { 01782762 (ISSN) },
    KEYWORDS = { 15N pool dilution, Clear-cutting, Coastal Western Hemlock, Nitrogen mineralization, Shelterwood harvesting },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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