Current and future CO<sub>2</sub> emissions from drained peatlands in Southeast Asia
Tóm tắt
Abstract. Forested tropical peatlands in Southeast Asia store at least 42 000 Million metric tonnes (Mt) of soil carbon. Human activity and climate change threatens the stability of this large pool, which has been decreasing rapidly over the last few decades owing to deforestation, drainage and fire. In this paper we estimate the carbon dioxide (CO2) emissions resulting from drainage of lowland tropical peatland for agricultural and forestry development which dominates the perturbation of the carbon balance in the region. Present and future emissions from drained peatlands are quantified using data on peatland extent and peat thickness, present and projected land use, water management practices and decomposition rates. Of the 27.1 Million hectares (Mha) of peatland in Southeast Asia, 12.9 Mha had been deforested and mostly drained by 2006. This latter area is increasing rapidly because of increasing land development pressures. Carbon dioxide (CO2) emission caused by decomposition of drained peatlands was between 355 Mt y−1 and 855 Mt y−1 in 2006 of which 82% came from Indonesia, largely Sumatra and Kalimantan. At a global scale, CO2 emission from peatland drainage in Southeast Asia is contributing the equivalent of 1.3% to 3.1% of current global CO2 emissions from the combustion of fossil fuel. If current peatland development and management practices continue, these emissions are predicted to continue for decades. This warrants inclusion of tropical peatland CO2 emissions in global greenhouse gas emission calculations and climate mitigation policies. Uncertainties in emission calculations are discussed and research needs for improved estimates are identified.
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Tài liệu tham khảo
Ali, M., Taylor, D., and Inubushi, K.: Effects of environmental variations on CO2 efflux from a tropical peatland in eastern Sumatra, Wetlands 26, 612–618, 2006.
Bartholomé, E. and Belward, A. S.: G.L.C. 2000: A new approach to global land cover mapping from Earth observation data, Int. J. Remote Sens., 26, 1959–1977, 2005.
Byrne, K. A., Chojnicki, B., Christensen, T. R., Drösler, M., Freibauer, A., Frolking, S., Lindroth, A., Mailhammer, J., Malmer, N., Selin, P., Turunen, J., Valentini, R., Zetterberg, L.: EU Peatlands: Current carbon stocks and trace gas fluxes, Carboeurope-GHG, concerted action synthesis of the European greenhouse gas budget, Department of Forest Science and Environment, Viterbo, Italy, 1–58, 2004.
Canadell, J. G., Le Quéré, C., Raupach, M. R., Field, C. B., Buitenhuis, E. T., Ciais, P., Conway, T. J, Gillett, N. P., Houghton, R. A., and Marland, G.: Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks. P. Natl. A. Sci., 104, 18866–18870, 2007.
Couwenberg, J., Dommain, R., and Joosten, H.: Greenhouse gas fluxes from tropical peatlands in southeast Asia, Glob. Change Biol., https://doi.org/10.1111/j.1365-2486.2009.02016.x, 2009.
FAO: Digital Soil map of the World, 2004.
Forster, P., Ramaswamy, V., Artaxo P., and Bernsten, T.: Changes in atmospheric constituents and in radiative forcing, in: Climate change: the physical science basis. Contribution of Working Group I to the fourth assessment report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., and Chen, Z., Cambridge University Press, Cambridge, 2007.
Global Forest Watch: The State of the Forest: Indonesia. Bogor, Indonesia: Forest Watch Indonesia, and Washington DC: Global Forest Watch, 2002.
Gullison, R. E., Frumhoff, P., Canadell, J. G., Field, C. B., Nepstad, D. C., Hayhoe, K., Avissar, R., Curran, L. M., Friedlingstein, P., Jones, C. D., and Nobre, C.: Tropical forests and climate policy, Science, 316, 985–986, https://doi.org/10.1126/science.1136163, 2007.
Hooijer, A.: Hydrology of tropical wetland forests: recent research results from Sarawak peat swamps, in: Forests-Water-People in the Humid Tropics, edited by: Bonell, M. and Bruijnzeel, L. A., Cambridge University Press, 447–461, 2005a.
Hooijer, A.: Hydrological assessment of forest plantation impacts on tropical forested peatlands; Kampar Peninsula, Sumatra, Indonesia, in: Landscape-Level assessment of hydrological & ecological values in the Kampar Peninsular, ProForest (UK) report to APRIL, 2005b.
Hooijer, A., Silvius, M., Wösten, H., and Page, S.: PEAT-CO2, Assessment of CO2 emissions from drained peatlands in SE Asia, Delft Hydraulics report Q3943/2006, 36p, http://peat-co2.deltares.nl, 2006.
Hooijer, A., Van der Vat, M., Prinsen, G., Vernimmen, R., Brinkman, J. J., and Zijl, F.: Hydrology of the EMRP Area – Water Management Implications for Peatlands, Technical Report Number 2 of the Master Plan for the Rehabilitation and Revitalisation of the Ex-Mega Rice Project Area in Central Kalimantan, Euroconsult Mott MacDonald and Deltares $\\vert$ Delft Hydraulics, 2008a.
Hooijer A.: Kampar Peninsula Science Based Management Support Project – Introduction to the SBMS Project and preliminary results to date, Delft Hydraulics report, 2008b.
IPCC 2006: IPCC Guidelines for National Greenhouse Gas Inventories, Chapter 5: Cropland, page 5.19, IPCC.
IPCC: Climate Change 2007: The Physical Scientific Basis. Summary for Policymakers. IPCC Secretariat, Geneva, pp. 21, 2007.
Jali, D.: Nitrogen mineralization in the tropical peat swamps, in: Proceedings of the 12th International Peat Congress, Tampere 6-11.6.2004, edited by: Päivänen, J., 644–652, 2004.
Jauhiainen, J., Jaya, A., Inoue, T., Heikkinen, J., Martikainen, P., and Vasander, H.: Carbon balance in managed tropical peat in Central Kalimantan, in: Proceedings of the 12thInternational Peat Congress, Tampere 6-11.6.2004, edited by: Päivänen, J., 653–659, 2004.
Jauhiainen, J., Takahashi, H., Heikkinen, J. E. P., Martikainen, P. J., and Vasander, H.: Carbon fluxes from a tropical peat swamp forest floor, Glob. Change Biol., 11, 1788–1797, 2005.
Jauhiainen, J., Limin, S., Silvennoinen, H., and Vasander, H.: Carbon dioxide and methane fluxes in drained tropical peat before and after hydrological restoration, Ecology, 89, 3503–3514, 2008.
Kanapathy, K.: Fertilizer requirement on peat soils, Malaysian Agricultural Journal, 50, 292–307, 1976.
Langner, A. and Siegert, F.: Spatiotemporal fire occurrence in Borneo over a period of 10 years, Glob. Change Biol., 15, 48–62, 2009.
Li, W., Dickinson, R. E., Fu, R., Niu, G. Y., Yang, Z. L., and Canadell, J. G.: Future Precipitation Changes and Their Implications for Tropical Peatlands, Geophys. Res. Lett., 34, L01403, https://doi.org/10.1029/2006GL028364, 2007.
Melling, L., Hatano, R., and Goh, K. J.: Soil CO2 flux from three ecosystems in tropical peatland of Sarawak, Malaysia, Tellus B, 57, 1–11, 2005.
Minkkinen, K., Byrne, K. A., and Trettin, C.: Climate impacts of peatland forestry, in: Peatlands and Climate Change, edited by: Strack, M., International Peat Society, Jyväskylä, Finland, 98–122, 2008.
Murayama, S. and Bakar, Z. A.: Decomposition of tropical peat soils, 2. Estimation of in situ decomposition by measurement of CO2 flux, Jarq-Jpn. Agr. Res. Q., 30, 153–158, 1996.
Neuzil, S. G.: Onset and rate of of peat and carbon accumulation in four domed ombrogenous peat deposits, Indonesia, in: Biodiversity and sustainability in peatlands – Proceedings of the International Symposium on Tropical Peatlands, Palangka Raya, Indonesia, edited by: Rieley, J. O. and Page, S. E., Samara Publishing, Cardigan, 55–72, 1997.
Page, S. E., Rieley, J. O., Shotyk, O. W., and Weiss, D.: Interdependence of peat and vegetation in a tropical peat swamp forest, Phil. Trans. R. Soc. Lond, B 345, 1885–1897, 1999.
Page, S. E., Siegert, F., Rieley, J. O., Boehm, H. V., Jaya, A., and Limin, S.: The amount of carbon released from peat and forest fires in Indonesia during 1997, Nature, 420, 61–65, 2002.
Rieley, J. O., Wüst, R. A. J., Jauhiainen, J., Page, S. E., Ritzema, H., Wösten, H., Hooijer, A., Siegert, F., Limin, S., Vasander, H., and Stahlhut, M.: Tropical Peatlands, Carbon stores, Carbon Gas Emissions and Contribution to Climate Change Processes, in: Peatlands and Climate Change, edited by: Strack, M., International Peat Society, Jyväskylä, Finland, 148–181, 2008.
Shimada, S., Takahashi, H., Haraguchi, A., and Kaneko, M.: The carbon content characteristics of tropical peats in Central Kalimantan, Indonesia: estimating their spatial variability in density, Biogeochemistry, 53, 249–267, 2001.
Silvius, M. J. and Taufik, A. W.: Conservation and Land Use of Kimaam Island, A survey report and compilation of existing information, PHPA/AWB Bogor, 1990.
Silvius, M. J. and Giesen, W.: Integration of Conservation and Land-Use Development of Swamp Forest of East Sumatra, in: Proceedings of the Workshop on Sumatra, Environment and Development: its past, present and future. Bogor, 16–18 September 1992, BIOTROP Special Publication No. 46, SEAMEO BIOTROP, Bogor, 1992.
Ueda, S., Go, C.-S. U., Yoshioka, T., Yoshida, N., Wada, E., Miyajima, T., Sugimoto, A., Boontanon N., Vijarnsorn, P., and Boonprakub, S.: Dynamics of dissolved O2, CO2, CH4, and N2O in a tropical coastal swamp in southern Thailand, Biogeochemistry, 49, 191–215, 2000.
Van der Werf, G. R., Dempewolf, J., Trigg, S. N., Randerson, J. T., Kasibhatla, P. S., Gigio, L., Murdiyarso, D., Peters, W., Morton, D. C., Collatz, G. J., Dolman, A. J., and DeFries, R. S.: Climate regulation of fire emissions and deforestation in equatorial Asia, PNAS, 105, 20350–20355, 2008.
Wetlands International: Maps of peatland distribution and carbon content in Sumatera, 1990–2002, 2003.
Wetlands International: Maps of peatland distribution and carbon content in Kalimantan, 2000–2002, 2004.
Wösten, J. H. M., Ismail, A. B., and Van Wijk, A. L. M.: Peat subsidence and its practical implications: a case study in Malaysia, Geoderma, 78, 25–36, 1997.
Wösten, J. H. M. and Ritzema, H. P.: Land and water management options for peatland development in Sarawak, Malaysia, International Peat Journal 11, 59–66, 2001.
Wösten, J. H. M., Van den Berg, J., Van Eijk, P., Gevers, G. J. M., Giesen, W. B. J. T., Hooijer, A., Idris, A., Leenman, P. H., Satriadi Rais Dipa, Siderius, C., Silvius, M. J., Suryadiputra, N., and Wibisono, I. W.: Interrelationships between Hydrology and Ecology in Fire Degraded Tropical Peat Swamp Forests, Int. J. Water Resour. D., 22, 157–174, 2006.