National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Changes of microclimate in a sedge-grass marsh within the last 40 years
Dušek, Jiří ; Stellner, Stanislav ; Hudecová, S.
The average, maximum and minimum air temperatures have been gradually increasing since 1977 to 2017. The air temperature rise was not the same in all periods of the year. We found different increases for individual months. The daily mean air temperature rose significantly in the growing period (April-August). The precipitation characteristics have been changing in the sedge-grass marsh too. The observed trends differ among months in sign as well as in the magnitude, and they are consistent with the air temperature changes. We found that extreme precipitation seems to occur significantly more frequently in recent years compared to the period before 2000. Awareness of these changes is important for possible positive human intervention when a desirable wetland ekosystem function is threatened.\n
Dynamics of CO2 output in model wetland ecosystem.
STELLNER, Stanislav
The main objective of this work was to evaluate the dynamics of CO2 and CH4 emissions from wetland soil of the sedge-grass marsh, which belongs to large complex of wet meadows near Třeboň town. CO2 and CH4 emission measurements realized on six places, where gas emission collars permanently inserted. Finally, samples of air were taking with using manual emission gas chambers within period from April 25th to November 24th 2014. The highest fluxes of CO2 were recorded in June and July. The lowest water level was recorded in this period together with low fluxes of CH4. Methane emissions were higher in September and October at the time where water level was above soil surface. Range of CO2-C fluxes was -9.38 mg m-2 h-1 (consumption) to 147.84 mg m-2 h-1 (emission). Range of CH4-C fluxes was -14.94 ?g m-2 h-1 (consumption) to 5561.67 ?g m-2 h-1(emission).

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