Continuous measurement of net biosphere-atmosphere carbon exchange was
performed in western Hungary over a managed semi-natural grassland
field using the eddy covariance technique to estimate Net Ecosystem
Exchange (NEE). The paper presents the measuring site and
instrumentation, as well as the data processing methods applied. The
measurements covered the period March 1999 to December 2000 during
which, on an annual time scale, the region acted as a net CO2 sink,
where NEE was -54 g C m(-2) in 1999 (data for January and February were
estimated) and -232 g C m(-2) in 2000 (negative NEE represents CO2
uptake by the vegetation). The remarkable inter-annual difference may
be the result of the significant climate difference between 1999 and
2000
