Title: The Human Footprint in the Carbon Cycle of Temperate and Boreal Forests
Authors: MAGNANI FedericoMENCUCCINI MaurizioBORGHETTI MarcoBERBIGIER PaulBERNINGER FrankDELZON SylvainGRELLE AchimHARI PerttiJARVIS PaulKOLARI PasiKOWALSKY AndrewLANKREIJER HarryLAW BeverlyLINDROTH AndersLOUSTAU DenisMANCA GIOVANNIMONCRIEFF JohnRAYMENT MarkTEDESCHI VanessaVALENTINI RiccardoGRACE John
Citation: NATURE vol. 447 p. 848-850
Publisher: NATURE PUBLISHING GROUP
Publication Year: 2007
JRC Publication N°: JRC41944
ISSN: 0028-0836
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC41944
DOI: 10.1038/nature05847
Type: Articles in Journals
Abstract: Temperate and boreal forests in the Northern Hemisphere cover an area of about 23107 square kilometres and act as a substantial carbon sink (0.6¿0.7 petagrams of carbon per year)1. 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 stations2,3. The relevance of this measurement effort has also been questioned4, 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 activities5. 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 saturation6 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).
JRC Institute:Institute for Environment and Sustainability

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