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Tropical forests: Their past, present, and potential future role in the terrestrial carbon budget

  • Part II Workshop Working Group Papers
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Abstract

In this paper we review results of research to summarize the state-of-knowledge of the past, present, and potential future roles of tropical forests in the global C cycle. In the pre-industrial period (ca. 1850), the flux from changes in tropical land use amounted to a small C source of about 0.06 Pg yr−1. By 1990, the C source had increased to 1.7 ± 0.5 Pg yr−1. The C pools in forest vegetation and soils in 1990 was estimated to be 159 Pg and 216 Pg, respectively. No concrete evidence is available for predicting how tropical forest ecosystems are likely to respond to CO2 enrichment and/or climate change. However, C sources from continuing deforestation are likely to overwhelm any change in C fluxes unless land management efforts become more aggressive. Future changes in land use under a “business as usual” scenario could release 41–77 Pg C over the next 60 yr. Carbon fluxes from losses in tropical forests may be lessened by aggressively pursued agricultural and forestry measures. These measures could reduce the magnitude of the tropical C source by 50 Pg by the year 2050. Policies to mitigate C losses must be multiple and concurrent, including reform of forestry, land tenure, and agricultural policies, forest protection, promotion of on-farm forestry, and establishment of plantations on non-forested lands. Policies should support improved agricultural productivity, especially replacing non-traditional slash-and-burn agriculture with more sustainable and appropriate approaches.

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Authors and Affiliations

  1. Department of Forestry, University of Illinois, W-503 Turner Hall, 1102 S. Goodwin, 61801, Urbana, IL, USA

    Sandra Brown

  2. Department of Environmental and Forest Biology, College of Environmental Science and Forestry, State University of New York, 13210, Syracuse, NY, USA

    Charles A. S. Hall

  3. Environmental Research and Consultancy, Rumbachtal 69, d4330, Muelheim an der Ruhr, Germany

    Wilhelm Knabe

  4. Department of Botany, Iowa State University, 353 Bessey Hall, 50011, Ames, IA, USA

    James Raich

  5. Trexler and Associates, 1131 SE River Forest Road, 97267, Oak Grove, OR, USA

    Mark C. Trexler

  6. TSBF, c/o UNESCO-ROSTA, UN Complex, Gigiri, P.O. Box 30592, Nairobi, Kenya

    Paul Woomer

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  1. Sandra Brown
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Brown, S., Hall, C.A.S., Knabe, W. et al. Tropical forests: Their past, present, and potential future role in the terrestrial carbon budget. Water Air Soil Pollut 70, 71–94 (1993). https://doi.org/10.1007/BF01104989

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