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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)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).

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References

  1. 1.

    et al. Forest carbon sinks in the Northern Hemisphere. Ecol. Appl. 12, 891–899 (2002)

  2. 2.

    et al. Respiration as the main determinant of carbon balance in European forests. Nature 404, 861–865 (2000)

  3. 3.

    et al. Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation. Agric. For. Meteorol. 113, 97–120 (2002)

  4. 4.

    Slow in, rapid out: carbon flux studies and Kyoto targets. Science 300, 1242–1243 (2003)

  5. 5.

    et al. Nitrogen cycles: past, present, and future. Biogeochemistry 70, 153–226 (2004)

  6. 6.

    et al. Nitrogen saturation in temperate forest ecosystems. Bioscience 48, 921–934 (1998)

  7. 7.

    & Carbon cycling and storage in world forests: biome patterns related to forest age. Glob. Change Biol. 10, 2052–2077 (2004)

  8. 8.

    et al. Modeling and measuring the effects of disturbance history and climate on carbon and water budgets in evergreen needleleaf forests. Agric. For. Meteorol. 113, 185–222 (2002)

  9. 9.

    , , , & Changes in carbon storage and fluxes in a chronosequence of ponderosa pine. Glob. Change Biol. 9, 510–524 (2003)

  10. 10.

    & The potential storage of carbon caused by eutrophication of the biosphere. Tellus B 37, 117–127 (1985)

  11. 11.

    , , & Spatial and temporal patterns in terrestrial carbon storage due to deposition of fossil fuel nitrogen. Ecol. Appl. 6, 806–814 (1996)

  12. 12.

    et al. Nitrogen deposition makes a minor contribution to carbon sequestration in temperate forests. Nature 398, 145–148 (1999)

  13. 13.

    , , & The impact of nitrogen deposition on carbon sequestration in European forests and forest soils. Glob. Change Biol. 12, 1151–1173 (2006)

  14. 14.

    , , & Nitrogen deposition onto the United States and Western Europe: synthesis of observations and models. Ecol. Appl. 15, 38–57 (2005)

  15. 15.

    Nitrogen-retention in forest soils. J. Environ. Qual. 21, 1–12 (1992)

  16. 16.

    & Nitrogen mineralization: Challenges of a changing paradigm. Ecology 85, 591–602 (2004)

  17. 17.

    , , , & Tree growth and soil acidification in response to 30 years of experimental nitrogen loading on boreal forest. Glob. Change Biol. 12, 489–499 (2006)

  18. 18.

    et al. Ecosystem response to 15 years of chronic nitrogen additions at the Harvard Forest LTER, Massachusetts, USA. For. Ecol. Manage. 196, 7–28 (2004)

  19. 19.

    & A generalized model of forest productivity using simplified concepts of radiation-use efficiency, carbon balance and partitioning. For. Ecol. Manage. 95, 209–228 (1997)

  20. 20.

    & ICBM: the introductory carbon balance model for exploration of soil carbon balances. Ecol. Appl. 7, 1226–1236 (1997)

  21. 21.

    , & Beyond annual budgets: carbon flux at different temporal scales in fire-prone Siberian Scots pine forests. Tellus B 54, 611–630 (2002)

  22. 22.

    , & Carbon storage along a stand development sequence in a New Zealand Nothofagus forest. For. Ecol. Manage. 177, 313–321 (2003)

  23. 23.

    , , & Large carbon uptake by an unmanaged 250-year-old deciduous forest in Central Germany. Agric. For. Meteorol. 118, 151–167 (2003)

  24. 24.

    Carbon Pools of European Beech Forests (Fagus sylvatica) Under Different Silvicultural Management. PhD thesis, Georg-August-Universität Göttingen. (2004)

  25. 25.

    , & Net primary production and net ecosystem production of a boreal black spruce wildfire chronosequence. Glob. Change Biol. 10, 473–487 (2004)

  26. 26.

    , , & Effect of stand age on whole ecosystem CO2 exchange in the Canadian boreal forest. J. Geophys. Res. 108 (D3). 8225 (2003)

  27. 27.

    , & Loss and recovery of ecosystem carbon pools following stand-replacing wildfire in Michigan jack pine forests. Can. J. For. Res. 34, 1908–1918 (2004)

  28. 28.

    , , & Effects of logging on carbon dynamics of a jack pine forest in Saskatchewan, Canada. Glob. Change Biol. 10, 1267–1284 (2004)

  29. 29.

    et al. Production, respiration, and overall carbon balance in an old-growth Pseudotsuga-Tsuga forest ecosystem. Ecosystems 7, 498–512 (2004)

  30. 30.

    , & Stand and soil changes along a mountain hemlock death and regrowth sequence. Ecology 69, 714–722 (1988)

  31. 31.

    et al. Estimates of the annual net carbon and water exchange of forests: the Euroflux methodology. Adv. Ecol. Res 30, 113–175 (2000)

  32. 32.

    , & Net primary production of forests: a constant fraction of gross primary production? Tree Physiol. 18, 129–134 (1998)

  33. 33.

    , & Assessing forest productivity in Australia and New Zealand using a physiologically-based model driven with averaged monthly weather data and satellite-derived estimates of canopy photosynthetic capacity. For. Ecol. Manage. 104, 113–127 (1998)

  34. 34.

    , & Predicted change in soil carbon following afforestation or reforestation, and analysis of controlling factors by linking a C accounting model (CAMFor) to models of forest growth (3PG), litter decomposition (GENDEC) and soil C turnover (RothC). For. Ecol. Manage. 177, 485–501 (2003)

  35. 35.

    , , & Measurements of gross and net ecosystem productivity and water vapour exchange of a Pinus ponderosa ecosystem, and an evaluation of two generalized models. Glob. Change Biol. 6, 155–168 (2000)

  36. 36.

    , & Performance of the forest productivity model 3-PG applied to a wide range of forest types. For. Ecol. Manage. 172, 199–214 (2003)

  37. 37.

    & The ICBM family of analytically solved models of soil carbon, nitrogen and microbial biomass dynamics. Descriptions and applications examples. Ecol. Model. 136, 191–207 (2001)

  38. 38.

    et al. in The Use of Remote Sensing in the Modeling of Forest Productivity (eds Gholz, H. L., Nakane, K. & Shimoda, H.) 273–298 (Kluwer Academic, Dordrecht, 1996)

  39. 39.

    in Biomass Production by Fast-Growing Trees (eds Pereira, J. S. & Landsberg, J. J.) 57–72 (Kluwer Academic, Dordrecht, 1989)

  40. 40.

    , & Multi-objective global optimization for hydrologic models. J. Hydrol. 204, 83–97 (1998)

  41. 41.

    Global Maps of Atmospheric Nitrogen Deposition, 1860, 1993, and 2050. Data set. 〈〉. (Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, 2006)

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Acknowledgements

This work was supported by the European Commission (General Directorate XII, CARBO-AGE project in the CARBOEUROPE cluster) and further supported by several national programmes. F.M. was also supported by the MIUR CarboItaly Project and by Società Produttori Sementi (Fondazione Cassa di Risparmio in Bologna) through the ‘Selvicoltura’ project.

Author information

Author notes

    • Giovanni Manca

    Present address: Institute for Environment and Sustainability—Climate Change Unit, Joint Research Center, European Commission, I-21020 Ispra, Italy.

Affiliations

  1. Department of Fruit Tree and Woody Plant Science, University of Bologna, Bologna I-40127, Italy

    • Federico Magnani
  2. School of GeoSciences, University of Edinburgh, Edinburgh EH93JU, UK

    • Maurizio Mencuccini
    • , Paul G. Jarvis
    • , John B. Moncrieff
    • , Mark Rayment
    •  & John Grace
  3. Department of Crop Systems, Forestry and Environmental Sciences, University of Basilicata, Potenza I-85100, Italy

    • Marco Borghetti
    •  & Vanessa Tedeschi
  4. INRA, UR1263 EPHYSE, Villenave d'Ornon F-33883, France

    • Paul Berbigier
    • , Sylvain Delzon
    • , Andrew S. Kowalski
    •  & Denis Loustau
  5. Departement des Sciences Biologiques, University of Québec à Montréal, Montréal, Quebec, H3C 3P8, Canada

    • Frank Berninger
  6. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden

    • Achim Grelle
  7. Department of Forest Ecology, University of Helsinki, FIN-00014 Helsinki, Finland

    • Pertti Hari
    •  & Pasi Kolari
  8. Department of Physical Geography and Ecosystems Analysis, Lund University, S-223 62 Lund, Sweden

    • Harry Lankreijer
    •  & Anders Lindroth
  9. College of Forestry, Oregon State University, Corvallis, OR 97331, USA

    • Beverly E. Law
  10. Department of Forest Resources and Environment, University of Tuscia, Viterbo I-01100 Italy

    • Giovanni Manca
    •  & Riccardo Valentini

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Competing interests

Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Corresponding author

Correspondence to Federico Magnani.

Supplementary information

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  1. 1.

    Supplementary Information 1

    This file contains Supplementary Figures S1-S8 with Legends and Supplementary Figure S1. The Supplementary Figures show N deposition maps; comparison of results based on to model-based interpolation with raw means and maxima; effects of N deposition when considering individual stands; effects of N deposition covariance with temperature, precipitation and site latitude. The Supplementary Table S1 shows detail of data source and integration procedures used in the computation of average C fluxes in forest chronosequences.

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https://doi.org/10.1038/nature05847

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