Microclimate and transpiration of reedbeds on lakeshores with changing water levels
2006
Anda, A. | Boldizsar, A.
Changes in the microclimate and transpiration of reedbeds on the shores of Lake Balaton, some still standing in water and some from which the water has receded, were examined in Keszthely Bay during the 2003 vegetation cycle, after canopy closure. Microclimate data were recorded using combined sensors connected to a data-collector. Ten-minute means calculated from data recorded every two seconds were used as the basis of comparison. Transpiration was quantified using the shoot mass loss method. The leaf area index of reeds growing on dry areas was greater than that of plants rooted in the lake. This difference was moderate at first, but increased greatly during the vegetative phase, and could be attributed primarily to differences in plant density and leaf size, and to the effect of waves. Among the components of the microclimate, the humiditywithin the stand was 8-20% greater for plants growing in water, irrespective of the weather and the development stage. The daily mean air temperature was lower in the dry stand, and exhibited considerable daily fluctuations. The mean daily sum of transpiration, averaged over three sample days, was 16.5% lower in the dry stand. The plot of daily changes in transpiration exhibited two peaks for the dry stand and one for the wet stand.
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