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Ecohydrological Behaviour of Mountain Beech Forest: Quantification of Stomatal Conductance Using Sap Flow Measurements

1
Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
2
School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
3
Institute of Hydrodynamics of the CAS, Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(5), 243; https://doi.org/10.3390/geosciences9050243
Received: 25 March 2019 / Revised: 13 May 2019 / Accepted: 21 May 2019 / Published: 26 May 2019
(This article belongs to the Special Issue Advances in Rainfall and Evaporation Partitioning)
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Abstract

In forested regions, transpiration as a main component of evaporation fluxes is important for evaporation partitioning. Physiological behaviours among various vegetation species are quite different. Thus, an accurate estimation of the transpiration rate from a certain tree species needs specific parameterization of stomatal response to multiple environmental conditions. In this study, we chose a 300-m2 beech forest plot located in Vydra basin, the Czech Republic, to investigate the transpiration of beech (Fagus sylvatica) from the middle of the vegetative period to the beginning of the deciduous period, covering 100 days. The sap flow equipment was installed in six trees with varying ages among 32 trees in the plot, and the measurements were used to infer the stomatal conductance. The diurnal pattern of stomatal conductance and the response of stomatal conductance under the multiple environmental conditions were analysed. The results show that the stomatal conductance inferred from sap flow reached the highest at midday but, on some days, there was a significant drop at midday, which might be attributed to the limits of the hydraulic potential of leaves (trees). The response of stomatal conductance showed no pattern with solar radiation and soil moisture, but it did show a clear correlation with the vapour deficit, in particular when explaining the midday drop. The relation to temperature was rather scattered as the measured period was in the moderate climate. The findings highlighted that the parametrization of stress functions based on the typical deciduous forest does not perfectly represent the measured stomatal response of beech. Therefore, measurements of sap flow can assist in better understanding transpiration in newly formed beech stands after bark beetle outbreaks in Central Europe. View Full-Text
Keywords: Transpiration; beech forest; stomatal conductance; sap flow measurement Transpiration; beech forest; stomatal conductance; sap flow measurement
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Su, Y.; Shao, W.; Vlček, L.; Langhammer, J. Ecohydrological Behaviour of Mountain Beech Forest: Quantification of Stomatal Conductance Using Sap Flow Measurements. Geosciences 2019, 9, 243.

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