HouleMartyDuchesne2015

Référence

Houle, D., Marty, C. and Duchesne, L. (2015) Response of canopy nitrogen uptake to a rapid decrease in bulk nitrate deposition in two eastern Canadian boreal forests. Oecologia, 177(1):29-37. (Scopus )

Résumé

A few studies have reported a recent and rapid decline in NO3 − deposition in eastern North America. Whether this trend can be observed at remote boreal sites with low rates of N deposition and how it could impact canopy uptake (CU) of N remain unknown. Here we report trends between 1997/1999 and 2012 for precipitation, throughfall N deposition as well as inorganic N CU for two boreal forest sites of Quebec, Canada, with contrasted N deposition rates and tree species composition. NO3 − bulk deposition declined by approximately 50 % at both sites over the studied period while no change was observed for NH4 +. As a result, the contribution of NH4 + to inorganic N deposition changed from ~33 % to more than 50 % during the study period. On average, 52–59 % of N deposition was intercepted by the canopy, the retention being higher for NH4 + (60–67 %) than for NO3 – (45–54 %). The decrease in NO3 – bulk deposition and the increase in the NH4 +:NO3 − ratio had important impacts on N–canopy interactions. The contribution of NH4 + CU to that of total inorganic N CU increased at both sites but the trend was significant only at Tirasse (lowest N deposition). At this site, absolute NO3 − CU significantly decreased (as did total N CU) during the study period, a consequence of the strong relationship (r2 = 0.88) between NO3 − bulk deposition and NO3 − CU. Our data suggest that N interactions with forest canopies may change rapidly with changes in N deposition as well as with tree species composition. © 2014, Springer-Verlag Berlin Heidelberg.

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@ARTICLE { HouleMartyDuchesne2015,
    AUTHOR = { Houle, D. and Marty, C. and Duchesne, L. },
    TITLE = { Response of canopy nitrogen uptake to a rapid decrease in bulk nitrate deposition in two eastern Canadian boreal forests },
    JOURNAL = { Oecologia },
    YEAR = { 2015 },
    VOLUME = { 177 },
    PAGES = { 29-37 },
    NUMBER = { 1 },
    NOTE = { cited By 3 },
    ABSTRACT = { A few studies have reported a recent and rapid decline in NO3 − deposition in eastern North America. Whether this trend can be observed at remote boreal sites with low rates of N deposition and how it could impact canopy uptake (CU) of N remain unknown. Here we report trends between 1997/1999 and 2012 for precipitation, throughfall N deposition as well as inorganic N CU for two boreal forest sites of Quebec, Canada, with contrasted N deposition rates and tree species composition. NO3 − bulk deposition declined by approximately 50 % at both sites over the studied period while no change was observed for NH4 +. As a result, the contribution of NH4 + to inorganic N deposition changed from ~33 % to more than 50 % during the study period. On average, 52–59 % of N deposition was intercepted by the canopy, the retention being higher for NH4 + (60–67 %) than for NO3 – (45–54 %). The decrease in NO3 – bulk deposition and the increase in the NH4 +:NO3 − ratio had important impacts on N–canopy interactions. The contribution of NH4 + CU to that of total inorganic N CU increased at both sites but the trend was significant only at Tirasse (lowest N deposition). At this site, absolute NO3 − CU significantly decreased (as did total N CU) during the study period, a consequence of the strong relationship (r2 = 0.88) between NO3 − bulk deposition and NO3 − CU. Our data suggest that N interactions with forest canopies may change rapidly with changes in N deposition as well as with tree species composition. © 2014, Springer-Verlag Berlin Heidelberg. },
    AUTHOR_KEYWORDS = { Boreal forest; Canopy uptake; Nitrogen deposition; Stream water; Throughfall },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1007/s00442-014-3118-0 },
    KEYWORDS = { air pollutant; ammonium derivative; nitrogen; nitrogen oxide, air pollutant; air pollution; analysis; Canada; climate; environmental monitoring; metabolism; plant leaf; taiga; tree, Air Pollutants; Air Pollution; Ammonium Compounds; Canada; Climate; Environmental Monitoring; Nitrogen; Nitrogen Oxides; Plant Leaves; Quebec; Taiga; Trees },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931284000&partnerID=40&md5=8e8326cbf3eef3086d3223f3f647727b },
}

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