Ste-MarieHoule2006

Référence

Ste-Marie, C., Houle, D. (2006) Forest floor gross and net nitrogen mineralization in three forest types in Quebec, Canada. Soil Biology and Biochemistry, 38(8):2135-2143. (Scopus )

Résumé

The effect of high nitrogen (N) depositions on forest ecosystems is an important concern in North America and may lead to N saturation of forest ecosystems and contribute to soils and surface water acidification. In this study, nitrogen dynamics in the FH layers of a sugar maple (SM), a balsam fir (BF) and a black spruce (BS) forest was characterized using a short term 15N isotopic pool dilutions approach and mid-term FH material incubation both in situ and in the laboratory. The short term dilutions approach indicated that the mean residence times of NH4 + and NO3 - in the FH material of the three sites were low (<1 d). The amount of inorganic nitrogen (NH4 + + NO3 -) recycled annually within the exchangeable forest floor reservoir was between one and two orders of magnitude larger than the annual atmospheric N deposition found at each of the sites. The BS site was clearly distinct than the two other forest types in that net N mineralization was negligible, even in absence of root uptake, suggesting that soil microorganisms were severely N limited. While net nitrification was not observed within the FH material of the BF site, NO3 - did accumulate in the FH of the SM despite a low pH of 3.72 presumably because of heterotrophic nitrification or as a result of acid-tolerant autotrophic nitrification. The difference in N dynamics between the sites were most probably caused by dominant tree species. Transformation rates of inorganic N were higher in SM, followed by BF and BS stands. Given that the potential to mineralize inorganic N matches with a superimposed N atmospheric deposition gradient in Québec, the sugar maple forest is more likely to be affected by N saturation than coniferous forests. © 2006 Elsevier Ltd. All rights reserved.

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@ARTICLE { Ste-MarieHoule2006,
    AUTHOR = { Ste-Marie, C. and Houle, D. },
    TITLE = { Forest floor gross and net nitrogen mineralization in three forest types in Quebec, Canada },
    JOURNAL = { Soil Biology and Biochemistry },
    YEAR = { 2006 },
    VOLUME = { 38 },
    PAGES = { 2135-2143 },
    NUMBER = { 8 },
    NOTE = { cited By 30 },
    ABSTRACT = { The effect of high nitrogen (N) depositions on forest ecosystems is an important concern in North America and may lead to N saturation of forest ecosystems and contribute to soils and surface water acidification. In this study, nitrogen dynamics in the FH layers of a sugar maple (SM), a balsam fir (BF) and a black spruce (BS) forest was characterized using a short term 15N isotopic pool dilutions approach and mid-term FH material incubation both in situ and in the laboratory. The short term dilutions approach indicated that the mean residence times of NH4 + and NO3 - in the FH material of the three sites were low (<1 d). The amount of inorganic nitrogen (NH4 + + NO3 -) recycled annually within the exchangeable forest floor reservoir was between one and two orders of magnitude larger than the annual atmospheric N deposition found at each of the sites. The BS site was clearly distinct than the two other forest types in that net N mineralization was negligible, even in absence of root uptake, suggesting that soil microorganisms were severely N limited. While net nitrification was not observed within the FH material of the BF site, NO3 - did accumulate in the FH of the SM despite a low pH of 3.72 presumably because of heterotrophic nitrification or as a result of acid-tolerant autotrophic nitrification. The difference in N dynamics between the sites were most probably caused by dominant tree species. Transformation rates of inorganic N were higher in SM, followed by BF and BS stands. Given that the potential to mineralize inorganic N matches with a superimposed N atmospheric deposition gradient in Québec, the sugar maple forest is more likely to be affected by N saturation than coniferous forests. © 2006 Elsevier Ltd. All rights reserved. },
    AUTHOR_KEYWORDS = { 15N pool dilution; N deposition; N dynamics; N immobilization; N mineralization; N saturation; Nitrification; Northern forests; Tree species },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.soilbio.2006.01.017 },
    KEYWORDS = { Ammonia; Biodiversity; Deposition; Ecosystems; Nitrification; Nutrition; pH effects; Plants (botany); Saturation (materials composition), N deposition; N dynamics; N immobilization; N mineralization; N saturation; Northern forests; Tree species, Nitrogen, acidification; forest floor; inorganic nitrogen; mineralization; nitrification; surface water, Canada; North America, Abies balsamea; Acer saccharum; Picea mariana },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-33746725352&partnerID=40&md5=6dc4292bb6baef279822c073636e10ce },
}

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