Net ecosystem production reflects the potential of
the ecosystem to sequestrate atmospheric CO2. Daily net ecosystem
production of a mountain Norway spruce forest of the temperate
zone (Czech Republic) was determined using the eddy covariance
method. Growing season days when the ecosystem was a CO2
source were examined with respect to current weather conditions.
During the 2005, 2006, and 2007 growing seasons, there were 44,
65, and 39 days, respectively, when the forest was a net CO2
source. The current weather conditions associated with CO2 release
during the growing seasons were: cool and overcast conditions
at the beginning or end of the growing seasons characterized
by a 3-year mean net ecosystem production of -7.2 kg C ha-1 day-1;
overcast or/and rainy days (-23.1 kg C ha-1 day-1); partly cloudy
and hot days (-11.8 kg C ha-1 day-1); and overcast and hot days
(-13.5 kg C ha-1 day-1). CO2 release was the highest during the
overcast or/and rainy conditions (84%, average from all years),
which had the greatest impact during the major production periods.
As forests are important CO2 sinks and more frequent weather
extremes are expected due to climate change, it is important to
predict future forest carbon balances to study the influence of
heightened variability in climatic variables.
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