|
|
The effect of elevated air CO2 concentration on water regime and transpiration of Norway spruce
Valouch, Ludvík ; Pokorný, Radek ; Tomášková, Ivana
Under the elevated CO2 air concentration, changes in physiological processes and morphology were evident in relatively short time. Direct measurement via heat pulse method proved reduction of specific sap flux throw the stem in the first year of cultivation in elevated CO2. SSF in both treatments was comparable in the next tree years. During the sixth year of fumigation, higher transpiration rate in trees growing under elevated CO2 was recorded. It was implication of larger bearing leaf area, larger conducting vessels area on the in crosscut stems section and larger root absorbed area. Continuously sap flow measuring of sun and shaded part of the crown was found that SSF of higher crown part was higher in both treatments. Average hydraulic conductance soil-leaf (GTsa) was 1,4 times higher in sunny part of the crown than estimated for the whole crown in ambient treatment A (ambient [CO2] concentration). Difference in hydraulic conductance between the upper and lower crown part of the E treatment (doubled [CO2] concentration of A treatment) was not so pronounced.
|
|
| |
|
|
Dynamics of Aerosol Number Size Distributions during an Experimental Campaign at the Bily Kriz Measuring Site
Ždímal, Vladimír ; Moravec, Pavel ; Smolík, Jiří ; Mikuška, Pavel ; Večeřa, Zbyněk ; Pokorný, Radek
This work aimed at studying the dynamics of atmospheric aerosol particle size distributions and interpreting it in connection to local concentrations of gaseous pollutants and basic meteorological parameters. Number size distributions had been monitored with high time resolution during an intense experimental campaign at a remote continental sampling site Bily Kriz. The site is located at the NE tip of the Czech Republic in the hilly region. The campaign had ben carried out at the end of June 2001. Several very interesting events were observed when formation of large amounts of new aerosol particles occured in the day time. Due to the behaviour of other measured parameters it was concluded that the so called "nucleation events" took place on a mesoscale region.
|
|
| |
|
| |
|
| |
guest ::
RSS feed.