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Photosynthetica

, Volume 43, Issue 2, pp 267–272 | Cite as

Chamber series and space-scale analysis of CO2 gas-exchange in grassland vegetation: A novel approach

  • Sz. Czobel
  • Sz. Foti
  • J. Balogh
  • Z. Nagy
  • S. Bartha
  • Z. Tuba
Article

Abstract

Significant part of our work was developing a new type of CO2 and H2O gas exchange chambers fit for measuring stand patches. Ground areas of six chambers (ranged between 0.044–4.531 m2) constituted a logarithmic series with doubling diameters from 7.5 to 240.0 cm. We demonstrate one of the first results for stand net ecosystem CO2 exchange (NEE) rates and temporal variability for two characteristic Central European grassland types: loess and sand. The measured mean NEE rates and their ranges in these grasslands were similar to values reported in other studies on temperate grasslands. We also dealt with the spatial scale dependence from ecophysiological point of view. Our chamber-series measurement was performed in a perennial ruderal weed association. The variability of CO2-assimilation of this weed vegetation showed clear spatial scale-dependence. We found the lowest variability of the vegetation photosynthesis at the small-middle scales. The results of spatial variability suggest the 0.2832 m2 patch size is the characteristic unit of the investigated weed association and there is a kind of synphysiological minimi-area with characteristic size for each vegetation type.

Additional key words

canopy chamber grassland loess sand stand CO2 measurements 

Abbrevations

CON

Convolvulo-Agropyretum

E

transpiration rate

EC

eddy correlation

FES

Festucetum vaginatae danubiale

GA

ground area

GIS

geographic information systems

LAI

leaf area index

n

number of replications

NDVI

normalised difference vegetation index

NEE

net ecosystem CO2 exchange

PAR

photosynthetically active radiation

RH

relative humidity

SAL

Salvio-Festucetum rupicolae

SD

standard deviation of measurements performed within one-day

SWC

soil water content

Ta

air temperature

Ts

soil temperature

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Copyright information

© Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 2005

Authors and Affiliations

  • Sz. Czobel
    • 1
  • Sz. Foti
    • 1
  • J. Balogh
    • 2
  • Z. Nagy
    • 1
  • S. Bartha
    • 3
  • Z. Tuba
    • 1
    • 2
  1. 1.Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental SciencesSzent Istvan UniversityGodolloHungary
  2. 2.Plant Ecological Research Group of Hungarian Academy of SciencesSzent Istvan UniversityGodolloHungary
  3. 3.Institute of Ecology and BotanyHungarian Academy of SciencesVacratotHungary

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