Seasonal and daily pattern, temporal and spatial variability of ecosystem CO2-exchange in a temperate Pannonian loess grassland

Authors

  • Szilvia Foti Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Hungary
  • Janos Balogh Departmental Research Group of Hungarian Academy of Sciences, Szent Istvan University, Hungary
  • Szilard Czobel Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Hungary
  • Zoltan Nagy Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Hungary
  • Sandor Bartha Institute of Ecology and Botany, Hungarian Academy of Sciences, Hungary
  • Zoltan Tuba Departmental Research Group of Hungarian Academy of Sciences, Szent Istvan University, Hungary

DOI:

https://doi.org/10.14720/abs.47.1.16738

Keywords:

carbon-balance, temperate grassland, chamber technique, net ecosystem CO2-exchange, carbon gain

Abstract

In the photosynthetically most active spring, summer and autumn vege­ tation period the investigated grassland did maintain a relatively strong daytime carbon gain. During winter the grassland displayed a slight daytime carbon loss. These data suggest that the grassland was a weak sink for carbon in the investigated period. CO2 exchange variability during the day seemed to be independent from that of the daily photosynthetic radiation. Thus other factors like soil respiration, soil moisture content and temperature and their interactions could be responsible for the high daily variabil­ ity of grassland CO2-exchange. The considerable temporal (daily and seasonal) vari­ ability of the grassland CO2-exchange can be considered as a characteristic feature of the grassland CO2-exchange. In the investigated loess grassland vegetation the variabil­ ity of CO2-exchange showed clear dependence on measuring area, which is obvious in the CV of NEE. We hypothetised that the spatial scale with the lowest variability is the characteristic area of the grassland ecosystem's CO2-exchange (CO2-exchange physi­ ological unit). In general decreased variability indicates a more regulated state.

References

ANGELL R. F. ET AL 2001: Bowen ratio and closed chamber carbon dioxide flux measurements over sagebrush steppe vegetation. Agricultural and Forest Meteorology 108: 153-161.

BARTHA S.ET AL 1997: Spatiotemporal scales of non-equilibrium community dynamics: a methodological challenge. New Zealand Journal of Ecology 21(2): 199-206.

BREYMEYER A. I. ET AL (Eds.) 1996: Global Change: Effects on Coniferous Forests and Grasslands.

DÖRR H. & K. 0. MÜNNICH 1987: Annual variation in soil respiration in selected areas of the temperate zone. Tellus 39B: 114-121.

HAM J. M. & A. K. KNAPP 1998: Fluxes of CO2, water vapor, and energy from prairie ecosystem during the seasonal transition from carbon sink to carbon source. Agricultural and Forest Meteorology 89: 12-14.

MUCINA L. & S. BARTHA 1999: Variance in species richness and guild proportionality in two contrasting dry grassland communities. Biologica, Bratislava 54: 67-75.

RICE C. V. & F. 0. GARCIA 1994: Biologically active pools of soil C and Nin tallgrass prairie. In: DoRAND J. ET AL. (eds.): Defining soil quality for a sustainable environment. Spec. Publ. No. 35. MSoil Sci. Soc. Am., Madison, WI.

VIRAGH K. & G. FEKETE 1984: Degradation stages in a xeroseries: composition, similarity, grouping, coordination. Acta Bot. Hung. 30: 427-459.

ZOLYOMI B. & G. FEKETE 1994: The Pannonian loess steppe: Differentiation in space and time. Abstracta Botanica 18: 29-41.

Downloads

Published

01.07.2004

Issue

Section

Original Research Paper

How to Cite

Foti, S., Balogh, J., Czobel, S., Nagy, Z., Bartha, S., & Tuba, Z. (2004). Seasonal and daily pattern, temporal and spatial variability of ecosystem CO2-exchange in a temperate Pannonian loess grassland. Acta Biologica Slovenica, 47(1), 13-20. https://doi.org/10.14720/abs.47.1.16738

Similar Articles

1-10 of 57

You may also start an advanced similarity search for this article.