The human footprint in the carbon cycle of temperate and boreal forests

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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Figure 1: Age-related dynamics of C balance components in forest ecosystems following disturbance.
Figure 2: Relationship between average NEP over the entire rotation and peak NEP in mature stands.
Figure 3: Environmental control of average C exchange over an entire rotation.

References

  1. 1

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

    Article  Google Scholar 

  2. 2

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

    ADS  CAS  Article  Google Scholar 

  3. 3

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

    ADS  Article  Google Scholar 

  4. 4

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

    Article  Google Scholar 

  5. 5

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

    CAS  Article  Google Scholar 

  6. 6

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

    Article  Google Scholar 

  7. 7

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

    ADS  Article  Google Scholar 

  8. 8

    Thornton, P. E. 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)

    ADS  Article  Google Scholar 

  9. 9

    Law, B. E., Sun, O. J., Campbell, J., vanTuyl, S. & Thornton, P. E. Changes in carbon storage and fluxes in a chronosequence of ponderosa pine. Glob. Change Biol. 9, 510–524 (2003)

    ADS  Article  Google Scholar 

  10. 10

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

    ADS  Article  Google Scholar 

  11. 11

    Townsend, A. R., Braswell, B. H., Holland, E. A. & Penner, J. E. Spatial and temporal patterns in terrestrial carbon storage due to deposition of fossil fuel nitrogen. Ecol. Appl. 6, 806–814 (1996)

    Article  Google Scholar 

  12. 12

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

    ADS  CAS  Article  Google Scholar 

  13. 13

    De Vries, W., Reinds, G. J., Gundersen, P. & Sterba, H. The impact of nitrogen deposition on carbon sequestration in European forests and forest soils. Glob. Change Biol. 12, 1151–1173 (2006)

    ADS  Article  Google Scholar 

  14. 14

    Holland, E. A., Braswell, B. H., Sulzman, J. & Lamarque, J. F. Nitrogen deposition onto the United States and Western Europe: synthesis of observations and models. Ecol. Appl. 15, 38–57 (2005)

    Article  Google Scholar 

  15. 15

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

    Article  Google Scholar 

  16. 16

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

    Article  Google Scholar 

  17. 17

    Högberg, P., Fan, H., Quist, M., Binkley, D. & Tamm, C. O. Tree growth and soil acidification in response to 30 years of experimental nitrogen loading on boreal forest. Glob. Change Biol. 12, 489–499 (2006)

    ADS  Article  Google Scholar 

  18. 18

    Magill, A. H. 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)

    Article  Google Scholar 

  19. 19

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

    Article  Google Scholar 

  20. 20

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

    Article  Google Scholar 

  21. 21

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

    ADS  Article  Google Scholar 

  22. 22

    Davis, M. R., Allen, R. B. & Clinton, P. W. Carbon storage along a stand development sequence in a New Zealand Nothofagus forest. For. Ecol. Manage. 177, 313–321 (2003)

    Article  Google Scholar 

  23. 23

    Knohl, A., Schulze, E.-D., Kolle, O. & Buchmann, N. Large carbon uptake by an unmanaged 250-year-old deciduous forest in Central Germany. Agric. For. Meteorol. 118, 151–167 (2003)

    ADS  Article  Google Scholar 

  24. 24

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

  25. 25

    Bond-Lamberty, B., Wang, C. & Gower, S. T. Net primary production and net ecosystem production of a boreal black spruce wildfire chronosequence. Glob. Change Biol. 10, 473–487 (2004)

    ADS  Article  Google Scholar 

  26. 26

    Litvak, M., Miller, S., Wofsy, S. C. & Goulden, M. Effect of stand age on whole ecosystem CO2 exchange in the Canadian boreal forest. J. Geophys. Res. 108 (D3). 8225 (2003)

    Article  Google Scholar 

  27. 27

    Rothstein, D. E., Yermakov, Z. & Buell, A. L. Loss and recovery of ecosystem carbon pools following stand-replacing wildfire in Michigan jack pine forests. Can. J. For. Res. 34, 1908–1918 (2004)

    Article  Google Scholar 

  28. 28

    Howard, E. A., Gower, S. T., Foley, J. A. & Kucharik, C. J. Effects of logging on carbon dynamics of a jack pine forest in Saskatchewan, Canada. Glob. Change Biol. 10, 1267–1284 (2004)

    ADS  Article  Google Scholar 

  29. 29

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

    CAS  Google Scholar 

  30. 30

    Boone, R. D., Sollins, P. & Cromack, K. Stand and soil changes along a mountain hemlock death and regrowth sequence. Ecology 69, 714–722 (1988)

    Article  Google Scholar 

  31. 31

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

    CAS  Article  Google Scholar 

  32. 32

    Waring, R. H., Landsberg, J. J. & Williams, M. Net primary production of forests: a constant fraction of gross primary production? Tree Physiol. 18, 129–134 (1998)

    Article  Google Scholar 

  33. 33

    Coops, N. C., Waring, R. H. & Landsberg, J. J. 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)

    Article  Google Scholar 

  34. 34

    Paul, K. I., Polglase, P. J. & Richards, G. P. 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)

    Article  Google Scholar 

  35. 35

    Law, B. E., Waring, R. H., Anthoni, P. M. & Abers, J. D. 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)

    ADS  Article  Google Scholar 

  36. 36

    Landsberg, J. J., Waring, R. H. & Coops, N. C. Performance of the forest productivity model 3-PG applied to a wide range of forest types. For. Ecol. Manage. 172, 199–214 (2003)

    Article  Google Scholar 

  37. 37

    Kätterer, T. & Andrén, O. 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)

    Article  Google Scholar 

  38. 38

    Landsberg, J. J. 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)

    Google Scholar 

  39. 39

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

    Google Scholar 

  40. 40

    Yapo, P. O., Gupta, H. V. & Sorooshian, S. Multi-objective global optimization for hydrologic models. J. Hydrol. 204, 83–97 (1998)

    ADS  Article  Google Scholar 

  41. 41

    Dentener, F. J. Global Maps of Atmospheric Nitrogen Deposition, 1860, 1993, and 2050. Data set. 〈http://daac.ornl.gov/〉. (Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, 2006)

    Google Scholar 

Download references

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.

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Correspondence to Federico Magnani.

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Supplementary information

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. (PDF 1611 kb)

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Magnani, F., Mencuccini, M., Borghetti, M. et al. The human footprint in the carbon cycle of temperate and boreal forests. Nature 447, 849–851 (2007). https://doi.org/10.1038/nature05847

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