Biogeosciences
www.biogeosciences.net
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7
4
2010
10.5194/bg-7-1207-2010
http://www.biogeosciences.net/7/1207/2010/
http://www.biogeosciences.net/7/1207/2010/bg-7-1207-2010.html
http://www.biogeosciences.net/7/1207/2010/bg-7-1207-2010.pdf
1207
1221
2010-04-06
Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau
L. Zhao
J. Li
S. Xu
H. Zhou
Y. Li
S. Gu
X. Zhao
xqzhao@nwipb.ac.cn
Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 81001, China
Graduate University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
Alpine wetland meadow could functions as a carbon sink due to it high soil
organic content and low decomposition. However, the magnitude and dynamics
of carbon stock in alpine wetland ecosystems are not well quantified.
Therefore, understanding how environmental variables affect the processes
that regulate carbon fluxes in alpine wetland meadow on the Qinghai-Tibetan
Plateau is critical. To address this issue, Gross Primary Production
(GPP), Ecosystem Respiration (<i>R</i><sub>eco</sub>), and Net Ecosystem Exchange (NEE) were
examined in an alpine wetland meadow using the eddy covariance method from
October 2003 to December 2006 at the Haibei Research Station of the Chinese
Academy of Sciences. Seasonal patterns of GPP and <i>R</i><sub>eco</sub> were closely
associated with leaf area index (LAI). The <i>R</i><sub>eco</sub> showed a positive
exponential to soil temperature and relatively low <i>R</i><sub>eco</sub> occurred during
the non-growing season after a rain event. This result is inconsistent with
the result observed in alpine shrubland meadow. In total, annual GPP were
estimated at 575.7, 682.9, and 630.97 g C m<sup>−2</sup> in 2004, 2005, and 2006,
respectively. Meanwhile, the <i>R</i><sub>eco</sub> were equal to 676.8, 726.4, 808.2 g C m<sup>−2</sup>,
and thus the NEE were 101.1, 44.0 and 173.2 g C m<sup>−2</sup>. These
results indicated that the alpine wetland meadow was a moderately source of
carbon dioxide (CO<sub>2</sub>). The observed carbon dioxide fluxes in the alpine
wetland meadow were higher than other alpine meadow such as <i>Kobresia humilis</i> meadow and
shrubland meadow.
% vor jede Referenz Amthor, J. S., Goulden, M. L., Mungeer, J. W., and Wofsy, S. C.: Testing a mechanistic model of forest-canopy mass and energy exchange using eddy correlation: carbon dioxide and ozone uptake by a mixed oak-maple stand, Aust. J. Plant Physiol.,21, 623–651, 1994.
Andreis, H. J.: A water table study on an Everglades peat soil: effects on sugarcane and on soil subsidence. Sugar J., 39, 8–12, 1976.
Aubinet, M., Grelle, A., Ibrom, A., et al.: Estimates of the annual net carbon and water vapor exchange of forests: the EUROFLUX methodology, Adv. Ecol. Res., 30, 113–175, 2000.
Baldocchi, D., Kelliher, F. M., and Black, T. A.: Climate and vegetation controls on boreal zone energy exchange, Glob. Change Biol., 6, 69–83, 2000.
Baldocchi, D., Falge, E., Olson, R., et al.: FLUXNET: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor and energy flux densities, B. Am. Meteorol. Soc., 82, 2415–2434, 2001.
Bowling, D. R., McDowell, N., and Bond, B.: $^13$C content of ecosystem respiration is linked to precipitation and vapor pressure deficit, Oecologia, 131, 113–124, 2002.
Bremer, D. J., Ham, J., and Owensby, C. E.: Responses of soil respiration to clipping and grazing in a tallgrass prairie, J. Environ. Qual., 27, 1539–1548, 1998.
Bubier, J. L., Bhatia, G., Moore, T. R., Roulet, N. T., and Lafleur, P. M.: Spatial and temporal variability in growing season net ecosystem carbon dioxide exchange at a large peatland in Ontario, Canada. Ecos., 6, 353–367, 2003.
Chapman, S. J. and Thurlow, M.: The influence of climate on CO<sub>2</sub> and CH<sub>4</sub> emissions from organic soils, Agr. Forest Meteorol., 79, 205–217, 1996.
Chen, B., Black, T. A., Coops, N. C., Krishnana, P., Jassal, R., Brümer, C., and Nesic, Z.: Seasonal controls on interannual variability in carbon dioxide exchange of a near-end-of rotation Douglas-fir stand in the Pacific Northwest, 1997–2006, Glob. Change Biol., 15, 1962–1981, 2009.
Coyne, P. I. and Kelly, J. J.: CO$_2 $ exchange in the Alaskan tundra: meteorological assessment by the aerodynamical method, J. Appl. Ecol., 12, 587–611, 1975.
Davidson, E. A., Belk, E., and Boone, R. D.: Soil water content and temperature as independent or confounded factors controlling soil respiration in a temperate mixed hardwood forest, Glob. Change Biol., 4, 217–227, 1998.
Dugas, W. A., Heuer, M. L., and Mayeux, H. S.: Carbon dioxide fluxes over Bermuda grass, native prairie, and sorghum, Agr. Forest Meteorol., 93, 121–139, 1999.
Falge, E., Baldocchi, D. D., and Tenhunen, J.: Seasonality of ecosystem respiration and gross primary production as derived from FLUXNET measurements, Agr. Forest Meteorol., 113, 53–74, 2002.
Flanagan, L. B., Wever, L. A., and Carson, P. J.: Seasonal and interannual variation in carbon dioxide exchange and carbon balance in a northern temperate grassland, Glob. Change Biol., 8, 599–615, 2002.
Gu, J., Smith, E. A., and Merritt, J. D.: Remote Sensing of Carbon/Water/Energy Parameters-Testing energy balance closure with GOES-retrieved net radiation and in situ measured eddy correlation fluxes in BOREAS, J. Geophys. Res., 104, 27881–27894, 1999.
Gorham, E.: Northern peatlands: role in the carbon cycle and probable responses to climatic warming, Ecol. Appl., 1, 182–195, 1991.
Griffis, T. J., Black, T. A., and Morgenstern, K.: Ecophysiological controls on the carbon balance of three southern boreal forests and southern boreal aspen forest, Agr. Forest Meteorol., 117, 53–71, 2003.
Ham, J. M. and Knapp, A. K.: Fluxes of CO<sub>2</sub>, water vapor, and energy from a prairie ecosystem during the seasonal transition from carbon sink to carbon source, Agr. Forest Meteorol., 89, 1–14, 1998.
Hollinger, D. Y., Kelliher, F. M., Byers, J. N., et al.: Carbon dioxide exchange between an undisturbed old-growth temperate forest and the atmosphere, Ecology, 75, 134–150, 1994.
Hodge, P. W.: Respiration processes in Waikato peat bogs, MSc thesis, University of Waikato, Hamilton, New Zealand, 2002.
Högberg, P., Nordgren, A., Buchmann, N., et al.: Large-scale forest girdling shows that current photosynthesis drives soil respiration, Nature, 411, 789–792, 2001.
Janssens, I. A., Lankreijer, H., Matteucci, G., et al.: Productivity overshadows temperature in determining soil and ecosystem respiration across European forests, Glob. Change Biol., 7, 269–278, 2001.
Jauhiainen, J., Takajashi, H., Heikkinen, J. E. P., et al.: Carbon fluxes from a tropical peat swamp forest floor, Glob. Change Biol., 11, 1788–1797, 2005.
Kato, T., Tang, Y. H., Gu, S., et al.: Carbon dioxide exchange between the atmosphere and an alpine meadow ecosystem on the Qinghai–Tibetan Plateau, China, Agr. Forest Meteorol., 124, 121–134, 2004a.
Kato, T., Tang, Y. H., Gu, S., et al.: Seasonal patterns of gross primary production and ecosystem respiration in an alpine meadow on the Qinghai-Tibetan Plateau, J. Geophys. Res., 109, D12109, doi:10.12109/2003JD003951, 2004b.
Kato, T., Tang, Y., Gu, S., Hirota, M., Du, M. Y., Li, Y. N., and Zhao, X. Q.: Temperature plays a major role in controlling ecosystem CO<sub>2</sub> exchange in an alpine meadow on the Qinghai-Tibetan Plateau, Glob. Change Biol., 12, 1285–1298, 2006.
Kim, J. and Verma, S. B.: Carbon dioxide exchange in a temperate grassland ecosystem, Bound. Lay. Meteorol., 52, 135–149, 1990.
Kim, J., Verma, S. B., and Clement, R. J.: Carbon dioxide budget in temperate grassland ecosystem, J. Geophys. Res., 97, 6057–606, 19923.
Lafleur, P. M., Moore, T. R., Roulet, N. T., and Frolking, S.: Ecosystem respiration in a cool temperate bog depends on peat temperature but not water table, Ecosystem, 8, 619–629, 2005.
Lappalainen, E.: Global Peat Resources, International Peat Society, Finland, 368~pp., 1996.
Law, B. E., Falge, E., Gu, L., et al.: Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation, Agr. Forest Meteorol., 113, 97–120, 2002.
Li, S. G., Lai, C. T., Yokoyama, T., and Oikawa, T.: Seasonal variation in energy budget and net ecosystem CO<sub>2</sub> exchange over a wet C<sub>3</sub>/C<sub>4</sub> co-occurring grassland: effects of development of the canopy, Ecol. Res., 18, 661–675, 2003.
Lloyd, J. and Taylor, J. A.: On the temperature dependence of soil respiration, Funct. Ecol., 8, 315–323, 1994.
Lloyd, C. R.: Annual carbon balance of a managed wetland meadow in the Somerset Levels, UK, Agr. Forest Meteorol., 138, 168–179, 2006.
Mahrt, L.: Flux sampling errors for aircraft and towers, J. Atmos. Oceanic Tech., 15, 416–429, 1998.
Matthews, E. and Fung, I.: Methane emission from natural wetlands: global distribution, area, and environmental characteristics of sources, Global Biogeochem. Cy., 1, 61–86, 1987.
Massman, W. J. and Lee, X.: Eddy covariance flux corrections and uncertainties in long-term studies of carbon and energy exchanges, Agr. Forest Meteorol., 113, 121–144, 2002.
Moore, T. R., Roulet, N. T., and Waddington, J. M.: Uncertainty in predicting the effect of climatic change on the carbon cycling of Canadian peatlands, Clim. Change, 40, 229–245, 1998.
Nieveen, J. P., Campbell, D. I., Schipper, L. A., and Blair, I. J.: Carbon exchange of grazed pasture on a drained peat soil, Glob. Change Biol., 11, 607–618, 2005.
Oechel, W. C. and Billings, W. D.: Effects of global change on the carbon balance of Arctic plants and ecosystems, in: Arctic Ecosystems in a Changing Climate: an Ecophysiological Perspective, edited by: Chapin III, F. S., Jefferies, P. L., Reynolds, J. F., Shaver, G. R., and Svoboda, J., Academic Press, London, 139–168, 1992.
Oechel, W. C., Hastings, S. J., Vourlitis, G., Jenkins, M., Riechers, G., and Grulke, N.: Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source, Nature, 361, 520–523, 1993.
Oechel, W. C., Vourlitis, G., and Hastings, S. J.: Cold season CO<sub>2</sub> emission from arctic soils, Global Biochem. Cy., 11(2), 163–172, 1997.
Raich, J. W. and Schlesinger, W. H.: The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate, Tellus, 44B, 81–99, 1992.
Ruimy, A., Jarvis, P. G., Baldocchi, D. D., et al.: CO<sub>2</sub> fluxes over plant canopies and solar radiation: a review, Adv. Ecolo. Res., 26, 1–68, 1995.
Silvola, J., Alm, J., Ahlholm, U., Nykanen, H., and Martikainen, P. J.: CO<sub>2</sub> fluxes from peat in boreal mires under varying temperature and moisture conditions, J. Ecol., 84, 219–228, 1996.
Soegaard, H. and Nordstroem, C.: Carbon dioxide exchange in a high-arctic fen estimated by eddy covariance measurements and modeling, Glob. Change Biol., 5, 547–562, 1999.
Stephens, J. C., Allen Jr., L. H., and Chen, E.: Organic soil subsidence, in: Man-induced land subsidence, edited by: Holzer, T. L., Geological Society of America Reviews in Engineering Geology, Boulder, CO, USA, Vol. 6, 107–122, 1984.
Sun, H. L. and Zheng, D.: Formation and Evolution of Qinghai-Xizang Plateau, Shanghai Science and Technology Press, Shanghai, 1996.
Suyker, A. E., Verma, S. B., and Arkebauer, T. J.: Season-long measurements of carbon dioxide exchange in a boreal fen, J. Geophys. Res., 102, 29021–29028, 1997.
Suyker, A. E. and Verma, S. B.: Year-round observations of the net ecosystem exchange of carbon dioxide in a native tallgrass prairie, Glob. Change Biol., 7, 179–289, 2001.
Svensson, B. H.: Carbon dioxide and methane fluxes from the ombrotrophic parts of a subarctic mire, Ecol. Bull. Stockholm, 30, 235–250, 1980.
Tappeiner, U. and Cernusca, A.: Microclimate and fluxes of water vapour, sensible heat and carbon dioxide in structurally differing subalpine plant communities in the Central Caucasus, Plant, Cell and Environ., 19, 403–417, 1996.
Turner, D. P., Urbanski, U., Bremer, D., Wofsy, S. C., Meyers, T., Gower, S. T., and Gregory, M.: A cross-biome comparison of daily light use efficiency for gross primary production, Glob. Change Biol., 9, 383–395, 2003.
Valentini, R., Gamon, J. A., and Field, C. B.: Ecosystem gas exchange in a California grassland: seasonal patterns and implications for scaling, Ecology, 76, 1940–1952, 1995.
Wang, G. X., Qian, J., Cheng, G. D., and Lai, Y. M.: Soil organic carbon pool of grassland soils on the Qinghai-Tibetan Plateau and its global implication, Sci. Total Environ., 291, 207–217, 2002.
Webb, E. K., Pearman, G. I., and Leuning, R.: Correction of flux measurements for density effects due to heat and water vapor transport, Q. J. Roy. Meteorol. Soc., 106, 85–100, 1980.
Wilson, K., Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier, P., Bernhofer, C., Ceulemans, R., Dolman, H., and Field, C.: Energy balance closure at FLUXNET sites, Agr. Forest Meteorol., 113, 223–243, 2002.
Xu, L. and Baldocchi, D. D.: Seasonal variation in carbon dioxide exchange over Mediterranean annual grassland in California, Agr. Forest Meteorol., 123, 79–96, 2004.
Xu, L., Baldocchi, D. D., and Tang, J.: How soil moisture, rain pulses, and growth alter the response of ecosystem respiration to temperature, Global Biol. Geo. Chem. Cy., 18, GB4002, doi:10.1029/2004GB002281, 2004.
Yamamoto, S., Saigusa, N., Harazono, Y., et al.: Present status of AsiaFlux Network and a view toward the future, Extended Abstract, Sixth International Carbon Dioxide Conference, Sendai, Japan, 404–407, 2001.
Zeller, K. F. and Nikolov, N. T.: Quantifying simultaneous fluxes of ozone, carbon dioxide and water vapour above a subalpine forest ecosystem, Environ. Pollut., 107, 1–20, 2000.
Zhao, K.: Marshes and Swamps of China: A Compilation, Science Press of China Beijing, 1999.
Zhao, X. and Zhou, X.: Ecological basis of alpine meadow ecosystem management in Tibet: Haibei Alpine Meadow Ecosystem Research Station, Ambio, 8, 642–647, 1999.
Zhao, L., Li, Y. N., Gu, S., Zhao, X. Q., Xu, S. X., and Yu, G. R.: Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan plateau, J. Int. Plant Biol., 47, 271–282, 2005a.
Zhao, L., Li, Y. N., Zhao, X. Q., Xu, S. X., Tang, Y. H., Yu, G. R., Gu, S., Du, M. Y., and Wang, Q. X.: Comparative study of the net exchange of CO<sub>2</sub> in 3 types of vegetation ecosystems on the Qinghai-Tibetan Plateau, Chinese Sci. Bull., 50, 1767–1774, 2005b.
Zhao, L., Xu, S. X., Fu, Y. L., Gu, S., Li, Y. N., Wang, Q. X., Du, M. Y., Zhao, X. Q., and Yu, G. R.: Effects of snow cover on CO<sub>2</sub> flux of northern alpine meadow on Qinghai-Tibetan plateau, Acta Agrestia Sinica, 13(3), 242–247, 2005c.
Zhao, L., Li, Y. N., Xu, S. X., Zhou, H. K., Gu, S., Yu, G. R., and Zhao, X. Q.: Diurnal, seasonal and annual variation in net ecosystem CO<sub>2</sub> exchange of an alpine shrubland on Qinghai-Tibetan plateau, Glob. Change Biol., 12, 1940–1953, 2006.
Zhao, L., Xu, S. X., Li, Y. N., Tang, Y. H., Zhao, X. Q., Gu, S., Du, M. Y., and Yu, G. R.: Relations between carbon dioxide fluxes and environmental factors of \textitKobresia humilis meadows and \textitPotentilla fruticosa meadows, Front. Biol. China 2007, 2(3), 1–9, 2007.