Abstract
Using the eddy covariance method, from 1 July 2003 to 30 June 2004, we conducted the observation and analysis of ecosystem CO2 flux in 3 types of alpine meadow vegetation (Kobresia humilis, Potentilla fruticosa shrub and Kobresia tibetica swamp meadows) on the Qinghai-Tibetan Plateau. The results show that the Kobresia humilis meadow, the shrub meadow and the swamp meadow’s highest CO2 uptake rates are 16.78, 10.42 and 16.57 μmol·m−2·s−1 respectively, while their highest CO2 release rates are 8.22, 7.73 and 18.67 μmol·m−2·s−1 respectively. The Kobresia humilis meadow and shrub meadow’s annual atmospheric uptakes are 282 g CO2/m2 and 53 g CO2/m2, respectively, while swamp meadow’s annual atmospheric release is 478 g CO2/m2. This proves that the Kobresia humilis meadow and the shrub meadow on the Qinghai-Tibetan Plateau have relatively low potential for CO2 uptake and release compared to C4 grasslands, a number of lowland grasslands, and forests. Moreover, swamp meadow has relatively high release potential. This, in turn, reveals clear differences in carbon source/sink between different types of vegetation in the Qinghai-Tibetan Plateau alpine meadow ecosystem. These differences are mainly brought by differences in the vegetations’ photosynthetic capacity and soil respiration.
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References
Hall, D. O., Scurlock, J. M. O., Climate change and productivity of natural grasslands, Ann. Bot., 1991, 67 (suppl.): 49–55.
Scurlock, J. M. O., Hall, D. O., The global carbon sink: A grassland perspective, Glob. Change Biol., 1998, 4: 229–233.
Kim, J., Verma, S. B., Clement, R. J., Carbon dioxide budget in a temperate grassland ecosystem, J. Geophys. Res., 1992, 97 (D5): 6057–6063.
Hum, J. M., Knapp, A. K., Fluxes of CO2, water vapor, and energy from a prairie ecosystem during the seasonal transition from carbon sink to carbon source, Agric. For. Meteorol., 1998, 89: 1–14.
Sims, P., Bradford, J. A., Carbon dioxide fluxes in a southern plains prairie, Agric, For. Meteorol., 2001, 109: 117–134.
Suyker, A. E., Verma, S. B., Year-round observations of the net ecosystem exchange of carbon dioxide in a native tallgrass prairie, Glob. Change Biol., 2001, 7: 279–289.
Suyker, A. E., Verma, S. B., Burba, G. G., Interannual variability in net CO2 exchange of a native tallgrass prairie, Glob. Change Biol., 2003, 9:255–265.
Monson, R. K., Turnipseed, A. A., Sparks, J. P. et al., Carbon sequestration in a high-elevation subalpine forest, Glob. Change Biol., 2002, 8: 459–478.
Gu, S., Tang, Y. H., Du, M. Y. et al., Short-term variation of CO2 flux in relation to environmental controls in an alpine meadow on the Qinghai-Tibetan plateau, J. Geophys. Res., 2003, 108(D21): 4670.
Gilmanov, T. G., Verma, S. B., Sims, P. L. et al., Gross primary production and light response parameters of four Southern Plains ecosystems estimated using long-term CO2-flux tower measurements, Glob. Biogeochem. Cycles., 2003, 17: 1071.
Xu, L. K., Baldocchi, D. D., Seasonal variation in carbon dioxide exchange over a mediterranean annual grassland in California, Agric. For. Meteorol., 2004, 1232: 79–96.
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, Agric. For. Meteorol., 2004, 124: 121–134.
Zheng, D., Zhang, Q. S., Wu, S. H., Mountain Geoecology and Sustainable Development of the Tibetan Plateau, Kluwer Acad., Norwell, Mass, 2000.
Sun, H., Formation and Evolution of Qinghai-Tibetan Plateau, Shanghai Science and Technology Press, 1996.
Zhou, X. M., Kobresia Meadow in China (in Chinese), Beijing: Science Press, 2001.
Li, Y. N., Wang, Q. X., Gu, S. et al., Integrated monitoring of alpine vegetation types and its primary production, Acta. Geograph. Sinica (in Chinese), 2004, 59: 40–48.
Webb, E. K., Pearman, G. I., Leuning, R., Correction of flux measurements for density effects due to heat and water vapor transfer, Quarterly Journal of the Royal Meteorological Society, 1980, 106: 85–100.
Sims, P., Bradford, J. A., Carbon dioxide fluxes in a southern plains prairie, Agric. For. Meteorol., 2001, 109: 117–134.
Monson, R. K., Turnipseed, A. A., Sparks, J. P. et al., Carbon sequestration in a high-elevation subalpine forest, Glob. Change Biol., 2002, 8: 459–478.
Ham, J. M., Knapp, A. K., Fluxes of CO2, water vapor, and energy from a prairie ecosystem during the seasonal transition from carbon sink to carbon source, Agric. For. Meteorol., 1998, 89: 1–14.
Li, S. G., Oikawa, T., Energy budget and canopy carbon dioxide flux over a humid C3 and C4 co-existing grassland, in Proceedings of the International Workshop for Advanced Flux Network and Flux Evaluation, CGER-REPORT., CGER-M011-2001, 23–28.
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Zhao, L., Li, Y., Zhao, X. et al. Comparative study of the net exchange of CO2 in 3 types of vegetation ecosystems on the Qinghai-Tibetan Plateau. Chin.Sci.Bull. 50, 1767–1774 (2005). https://doi.org/10.1360/04wd0316
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DOI: https://doi.org/10.1360/04wd0316