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Christensen, Torben Røjle (1999)
Publisher: Co-Action Publishing
Journal: Polar Research
Languages: English
Types: Article
Subjects:
This paper provides an overview of results obtained through a number of studies of actual and potential trace gas exchanges in Eurasian and Greenlandic tundra ecosystems. The chief findings include: i) Long-term accumulation rates of carbon in organic tundra soils, i.e. net uptake of atmospheric CO2, are strongly controlled by simple climatic parameters (mean July temperature, annual precipitation). Warmer and wetter conditions stimulate carbon sequestration rates in Arctic terrestrial ecosystems. ii) The release of carbon through ecosystem respiration is also heavily influenced by climate. However, the release of dead organic soil carbon as CO2 is constraind by the lability of the stored organic compounds. This lability decreases significantly with depth (i.e. age) of the soils; moreover, this in turn decreases the temperature sensitivity of the decomposition process. iii) Methane emissions from typical tundra habitats in northern Eurasia are slightly lower than from seemingly similar habitats in North America although this difference probably can be attributed to the colder climatic setting of the studied sites compared with the general climatic conditions at the North American sites. There is a strong linkage between CO2 exchange, CH4 formation and emission rates in some wet tundra ecosystems. iv) Atmospheric uptake of CH4 occurs in some dry and mesic tundra habitats and there are indications that these uptake rates could be affected negatively by atmospheric nitrogen deposition. Emissions of N2O are rarely seen fromArctic soils but there appear to be a strong potential for denitrification and, hence, N2O release. This might be due to high rates of denitrification during the spring thaw and possibly associated significant releases of N2O in this period.
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    • Adams, J. M.. Faure, H., Faure-Denard, L., Mcglade, J. M. & Woodward. F. L. 1990: Increases in terrestrial carbon storage from the Last Glacial Maximum to the present. Nature 348, 7 11-714.
    • Aerts, R. 1997: Atmospheric nitrogen deposition affects potential denitrification and N 2 0 emission from peat soils in The Netherlands. Soil B i d . Biochem. 29, 1153-1 156.
    • Christensen. S. & Christensen, B. T. 1991: Organic matter available for denitrification in different soil fractions: effect of freezdthaw cycles and straw disposal. J. Soil Sci. 42, 637-647.
    • Christensen, T. R., Friborg, T., Sommerkorn, M., Kaplan, J . , Illeris, L., Soegaard, H., Nordstroem, C. & Jonasson, S. in press: Trace gas exchange in a high Arctic valley 1: variations in COz and CH, flux between tundra vegetation types. Global Biogeochem. Cycles.
    • Christensen. T. R., Jonasson, S . , Callaghan, T. V. & Havstrom, M. 1995: Spatial variation in high latitude methane flux along a transect across Siberian and European tundra environments. J. Geophys. Res. IOOD, 21035-21045.
    • Christensen, T . R., Jonasson, S., Callaghan, T. V. & Havstrom, M. 1999: On the potential COa releases from tundra environments in a changing climate. Appl. Soil Ecol. 11. 1?7-134.
    • Christensen, T. R., Jonasson, S., Callaghan, T. V., Havstrom, M. & Livens, F. R. 1999: Carbon cycling and methane exchange in Eurasian tundra ecosystems. Ambio 28, 239-244.
    • Christensen T . R., Jonasson S., Michelsen A., Callaghan. T. V. & Havstrom, M. 1998: Environmental controls on soil respiration in the Eurasian and Greenlandic Arctic. J. Geophys. Res. 103(022), 29015-29021.
    • Christensen, T. R.. Michelsen, A. & Jonasson, S. 1999: Exchange of CH4 and NzO in a subarctic heath soil: effects of inorganic Nand P amino acid addition. Soil Biol. Biochem. 31, 637-641.
    • Christensen, T . R., Michelsen, A,, Jonasson, S. and Schmidt, I. K. 1997: Carbon dioxide and methane exchange of a subarctic heath in response to climate change related environmental manipulations. Oikos 79, 34-44.
    • Christensen, T. R.. Prentice, I. C., Kaplan, J., Haxeltine, A. & Sitch, S. 1996: Methane flux from northern wetlands and tundra: an ecosystem source modelling approach. Tellus 48B, 651-660.
    • Clymo, R. S. 1983: Peat. In A. J. P. Gore (ed.): Ecosystems of the world 4A, mires: swamp, bog. fen and moor. Pp. 159-224. Oxford: General Studies Elsevier.
    • Dorland, S. & Beachamp, E. G. 1991: Denitrification and ammonification at low soil temperatures. Can. J. Soil Sci. 42. 162-171.
    • Friborg, T., Christensen, T. R., Hansen, B. U.,Nordstroem, C. & Soegaard. H. in press: Trace gas exchange in a high Arctic valley 2: landscape CH4 fluxes measured and modelled using eddy correlation data. Global Biogeochem. Cycles.
    • Fung, I., John, J., Lerner, J.. Matthews, E., Prather, M., Steele, L. P. & Fraser, P. J. 1991: Three-dimensional model synthesis of the global methane cycle. J. Geophys. Res. 9 6 0 , 13033-13065.
    • Guthrie, P. D. 1986: Biological methanogenesis and the CO2 greenhouse effect. J. Geophys. Res. 9I(DIO), 10,847-10.851.
    • Heal, 0. W., Flanagan, P. W.. French, D. D. & Maclean. S. F. 1982: Decomposition and accumulation of organic matter. In L. C. Bliss et al. (eds.): Tundra ecosystems: a comparative analysis. Pp. 587-633. Cambridge: Cambridge University Press.
    • Houghton, J. T., Meira Filho. L. G., Bruce, J., Hoesung, L., Calbander, B. A., Haites, E., Harris, N. & Maskell, K. (eds.) 1995: Climate change 1994, radiative jorcing of climate change and an evaluation of the IPCC IS92 Emission Scenarios. Cambridge: Cambridge University Press.
    • Joabsson, A,, Christensen, T. R. & Wallen, B.1999a: Vascular plant controls on methane emissions from northern peatforming wetlands. Trends Ecol. Evol. 14, 385-388.
    • Joabsson, A,, Christensen, T. R. & Walltn, B. 1999h: lnfluence of vascular plant photosynthetic rate on CH, emission from peat monoliths from southern boreal Sweden. Polar Res. I8(2),215-220.
    • Jonasson, S . , Michelsen. A,, Schmidt, I. K., Nielsen, E. V. & Callaghan, T.V. 1996 Microbial biomass C, N and P in two Arctic soils and responses to addition of NPK fertilizer and sugar: implications for plant nutrient uptake. Oecologia 106, 507-5 15.
    • Kruse, C. W. & Iversen, N. 1995: Effect of plant succession, ploughing and fertilization on the microbiological oxidation of atmospheric methane in a heathland soil. FEMS Microbiol. Ecol. 18, 121-128.
    • Malbi, S. S., McGill, W. B. & Nyhorg. M. 1990: Nitrate losses in soils: effect of temperature, moisture and substrate concentration. Soil Biol. Biochem. 22. 733-737.
    • Malmer, N. & Wallen, B. 1996: Peat formation and mass balance in subarctic ombrotrophic peatlands around Abisko, northern Scandinavia. In P. S . Karlsson & T. V. Callaghan (eds.): Plant eco1og.v of the subarctic Swedish Lapland. Ecol. Bull. (Copenhagen) 45, 79-92.
    • Oechel, W. C., Hastings. S. T., Vourlitis, G., Jenkins, M., Riechers, G. & Grulke, N. 1993: Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source. Nature 361, 520-523.
    • Reeburgh, W. S.,Roulet, N. T. & Svensson, B. 1994: Terrestrial biosphere-atmosphere exchange in high latitudes. In R. G. Prim (ed.): Global atmospheric-biosphere chemistry. Pp. 165-178. New York: Plenum Press.
    • Roulet, N. T., Jano, A,. Kelly, C. A,. Klinger. L., Moore, T. R., Protz, R., fitter. J. A. & Rouse, W. R. 1994: Role of the Hudson Bay lowland as a source of atmospheric methane. J. Geophys. Res. 99D, 1439-1454.
    • Schnell, S. & King, G. M. 1994: Mechanistic analysis of ammonium inhibition of atmospheric methane consumption in forest soils. Appl. Env. Microbiol. 60, 3514-3521.
    • Steudler P. A,, Bowden R. D., Mellillo, J. M. & Aber, J. D. 1989: Influence of nitrogen fertilization on methane uptake in temperate forest soils. Nature 341, 314-3 16.
    • Waddington, J. M., Roulet, N. T. & Swanson. R. V . 1996: Water table control of CH4 emission enhancement by vascular plants in boreal peatlands. J. Geophys. Res. 101. 22175-22185.
    • Whiting, G. J. & Chanton, J. P. 1993: Primary production control of methane emission from wetlands. Nature 364, 794-795.
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