Summary
Carbon dioxide efflux and soil microenvironmental factors were measured diurnally in Carex aquatilus-and Eriophorum angustifolium-dominated riparian tundra communities to determine the relative importance of soil environmental factors controlling ecosystem carbon dioxide exchange with the atmosphere. Measurements were made weekly between 18 June and 24 July 1990. Diurnal patterns in carbon dioxide efflux were best explained by changes in soil temperature, while seasonal changes in efflux were correlated with changes in depth to water table, depth to frozen soil and soil moisture. Carbon dioxide efflux rates were lowest early in the growing season when high water tables and low soil temperatures limited microbial and root activity. Individual rainfall events that raised the water table were found to strongly reduce carbon dioxide efflux. As the growing season progressed, rainfall was low and depth to water table and soil temperatures increased. In response, carbon dioxide efflux increased strongly, attaining rates late in the season of approximately 10 g CO2 m−2 day−1. These rates are as high as maxima recorded for other arctic sites. A mathematical model is developed which demonstrates that soil temperature and depth to water table may be used as efficient predictors of ecosystem CO2 efflux in this habitat. In parallel with the field measurements of CO2 efflux, microbial respiration was studied in the laboratory as a function of temperature and water content. Estimates of microbial respiration per square meter under field conditions were made by adjusting for potential respiring soil volume as water table changed and using measured soil temperatures. The results indicate that the effect of these factors on microbial respiration may explain a large part of the diurnal and seasonal variation observed in CO2 efflux. As in coastal tundra sites, environmental changes that alter water table depth in riparian tundra communities will have large effects on ecosystem CO2 efflux and carbon balance.
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References
Anderson JPE, Domsch KH (1978) A physiological method for the quantitative measurement of microbial biomass in soil. Soil Biol Biochem 10: 215–221
Billings WD, Peterson KM, Shaver GR, Trent AW (1977) Root growth, respiration, and carbon dioxide evolution in an arctic tundra soil. Arct Alp Res 9: 129–137
Billings WD, Peterson KM, Shaver GR (1978) Growth, turnover, and respiration rates of roots and tillers in tundra communities. In: Tieszen LL (ed) Vegetation and Production Ecology of an Alaskan Arctic Tundra. Springer, New York, pp 415–434
Billings WD, Luken JO, Mortenson DA, Peterson KM (1982) Arctic tundra: a source or sink for atmospheric carbon dioxide in a changing environment. Oecologia 53: 7–11
Billings WD, Luken JO, Mortenson DA, Peterson KM (1983) Increasing atmospheric carbon dioxide: possible effects on arctic tundra. Oecologia 58: 286–289
Chapin FS III, Fetcher N, Kielland K, Everett K, Linkins AE (1988) Productivity and nutrient cycling of Alaskan tundra: enhancement by flowing soil water. Ecology 69: 693–702
Cheng W, Coleman DC (1989) A simple method for measuring CO2 in a continuous air-flow system: modifications to the substrate-induced respiration technique. Soil Biol Biochem 21: 385–388
Cheng W, Virginia RA (1992) Measurement of microbial biomass in arctic tundra soils using fumigation-extraction and substrate-induced respiration procedures. Soil Biol Biochem (in press)
Giblin AE, Nadelhoffer KJ, Shaver GR, Laundre JA, McKerrow AJ (1991) Biogeochemical diversity along a riverside toposequence in arctic Alska. Ecol Monogr 61: 415–435
Gorham E (1991) Northern peatlands: role in the carbon cycle and probably responses to climatic warming. Ecol Appl 1: 182–195
Grulke NE, Riechers GH, Oechel WC, Hjelm U, Jaegar C (1990) Carbon balance in tussock tundra under ambient and elevated atmospheric CO2. Oecologia 83: 485–494
Harley PC, Tenhunen JD, Murray KJ, Beyers J (1989) Irradiance and temperature effects on photosynthesis of tussock tundra Sphagnum mosses from the foothills of the Philip Smith Mountains, Alaska. Oecologia 79: 251–259
Kummerow J, Mills JN, Ellis BA, Hastings SJ, Kummerow A (1987) Downslope fertilizer movement in arctic tussock tundra. Holarct Ecol 10: 312–319
Letey J, Stolzy LH (1964) Measurement of oxygen diffusion rates with the platinum microelectrode I. Theory and equipment. Hilgardia 35: 545–554
Luken JO, Billings WD (1985) The influence of microtopographic heterogeneity on carbon dioxide efflux from a subarctic bog. Holarct Ecol 8: 306–312
Moore TR (1986) Carbon dioxide evolution from subarctic peatlands in Eastern Canada. Arct Alp Res 18: 189–193
Moore TR (1989) Plant production decomposition, and carbon efflux in a subarctic patterned fen. Arct Alp Res 21: 156–162
Moore TR, Knowles R (1989) The influence of water table levels on methane and carbon dioxide emissions from peatland soils. Can J Soil Sci 69: 33–38
Nadelhoffer KJ, Giblin AE, Shaver GR, Laundre JA (1991) Effects of temperature and substrate quality on element mineralization in six arctic soils. Ecology 72: 242–253
Oberbauer SF, Tenhunen JD, Reynolds JF (1991) Environmental effects on CO2 efflux from water track and tussock tundra in Arctic Alaska, USA. Arct Alp Res 23: 162–169
Oechel WC, Billings WD (1992) Effects of global change on the carbon balance of arctic plants and ecosystems. In: Chapin FS III, Jefferies RL, Reynolds JF, Shaver GR, Svoboda J (eds) Arctic ecosystems in a changing climate. Academic Press, San Diego, pp 139–168
Peterson KM, Billings WD (1975) Carbon dioxide flux from tundra soils and vegetation as related to temperature at Barrow Alaska. Am Midl Nat 94: 88–98
Peterson KM, Billings WD, Reynolds DN (1984) Influence of water table and atmospheric CO2 concentration on the carbon balance of arctic tundra. Arct Alp Res 16: 331–335
Poole DK, Miller PC (1982) Carbon dioxide flux from three arctic tundra types in north-Central Alaska, USA. Arct Alp Res 14: 27–32
Siegwolf R (1987) CO2-Gaswechel von Rhododendron ferrugineum L. im Jahresgang an der alpinen Waldgrenze. Ph.D. dissertation, Universitat Innsbruck
Shaver GR, Chapin FS IIIW (1991) Production: biomass relationships and element cycling in contrasting arctic vegetation types. Ecol Monogr 61: 1–32
Walker DA, Binnian E, Evans BM, Lederer ND, Nordstrand E, Webber PJ (1989) Terrain, vegetation, and landscape evolution of the R4D research Site, Brooks Range foothills, Alaska. Holarct Ecol 12: 238–261
Whalen SC, Reeburgh WS, Reimers CE (1993) Control of tundra methane emission by microbial oxidation. In: Reynolds JF, Tenhunen JD (eds) Landscape function: implications for ecosystem response to disturbance, a case study in arctic tundra (Ecological Studies). Springer, Berlin Heidelberg New York (in press)
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Oberbauer, S.F., Gillespie, C.T., Cheng, W. et al. Environmental effects on CO2 efflux from riparian tundra in the northern foothills of the Brooks Range, Alaska, USA. Oecologia 92, 568–577 (1992). https://doi.org/10.1007/BF00317851
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DOI: https://doi.org/10.1007/BF00317851