MagnaniMencucciniBorghettiEtAl2007

Référence

Magnani, F., Mencuccini, M., Borghetti, M., Berbigier, P., Berninger, F., Delzon, S., Grelle, A., Hari, P., Jarvis, P.G., Kolari, P., Kowalski, A.S., Lankreijer, H., Law, B.E., Lindroth, A., Loustau, D., Manca, G., Moncrieff, J.B., Rayment, M., Tedeschi, V., Valentini, R. and Grace, J. (2007) The human footprint in the carbon cycle of temperate and boreal forests. Nature, 447(7146):848-850. (Scopus )

Résumé

Temperate and boreal forests in the Northern Hemisphere cover an area of about 2 × 107 square kilometres and act as a substantial carbon sink (0.6-0.7 petagrams of carbon per year). Although forest expansion following agricultural abandonment is certainly responsible for an important fraction of this carbon sink activity, the additional effects on the carbon balance of established forests of increased atmospheric carbon dioxide, increasing temperatures, changes in management practices and nitrogen deposition are difficult to disentangle, despite an extensive network of measurement stations. The relevance of this measurement effort has also been questioned, because spot measurements fail to take into account the role of disturbances, either natural (fire, pests, windstorms) or anthropogenic (forest harvesting). Here we show that the temporal dynamics following stand-replacing disturbances do indeed account for a very large fraction of the overall variability in forest carbon sequestration. After the confounding effects of disturbance have been factored out, however, forest net carbon sequestration is found to be overwhelmingly driven by nitrogen deposition, largely the result of anthropogenic activities. The effect is always positive over the range of nitrogen deposition covered by currently available data sets, casting doubts on the risk of widespread ecosystem nitrogen saturation under natural conditions. The results demonstrate that mankind is ultimately controlling the carbon balance of temperate and boreal forests, either directly (through forest management) or indirectly (through nitrogen deposition). ©2007 Nature Publishing Group.

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@ARTICLE { MagnaniMencucciniBorghettiEtAl2007,
    AUTHOR = { Magnani, F. and Mencuccini, M. and Borghetti, M. and Berbigier, P. and Berninger, F. and Delzon, S. and Grelle, A. and Hari, P. and Jarvis, P.G. and Kolari, P. and Kowalski, A.S. and Lankreijer, H. and Law, B.E. and Lindroth, A. and Loustau, D. and Manca, G. and Moncrieff, J.B. and Rayment, M. and Tedeschi, V. and Valentini, R. and Grace, J. },
    TITLE = { The human footprint in the carbon cycle of temperate and boreal forests },
    JOURNAL = { Nature },
    YEAR = { 2007 },
    VOLUME = { 447 },
    PAGES = { 848--850 },
    NUMBER = { 7146 },
    ABSTRACT = { Temperate and boreal forests in the Northern Hemisphere cover an area of about 2 × 107 square kilometres and act as a substantial carbon sink (0.6-0.7 petagrams of carbon per year). Although forest expansion following agricultural abandonment is certainly responsible for an important fraction of this carbon sink activity, the additional effects on the carbon balance of established forests of increased atmospheric carbon dioxide, increasing temperatures, changes in management practices and nitrogen deposition are difficult to disentangle, despite an extensive network of measurement stations. The relevance of this measurement effort has also been questioned, because spot measurements fail to take into account the role of disturbances, either natural (fire, pests, windstorms) or anthropogenic (forest harvesting). Here we show that the temporal dynamics following stand-replacing disturbances do indeed account for a very large fraction of the overall variability in forest carbon sequestration. After the confounding effects of disturbance have been factored out, however, forest net carbon sequestration is found to be overwhelmingly driven by nitrogen deposition, largely the result of anthropogenic activities. The effect is always positive over the range of nitrogen deposition covered by currently available data sets, casting doubts on the risk of widespread ecosystem nitrogen saturation under natural conditions. The results demonstrate that mankind is ultimately controlling the carbon balance of temperate and boreal forests, either directly (through forest management) or indirectly (through nitrogen deposition). ©2007 Nature Publishing Group. },
    ADDRESS = { Institute for Environment and Sustainability - Climate Change Unit, Joint Research Center, European Commission, I-21020 Ispra, Italy },
    COMMENT = { Cited By (since 1996): 1 Export Date: 23 August 2007 Source: Scopus CODEN: NATUA doi: 10.1038/nature05847 Language of Original Document: English Correspondence Address: Magnani, F.; Department of Fruit Tree and Woody Plant Science; University of Bologna Bologna I-40127, Italy; email: federico.magnani@unibo.it },
    ISSN = { 00280836 (ISSN) },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
    URL = { http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-34250334315&partnerID=40&rel=R6.5.0 },
}

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