Transpiration of Pinus rotundata on a wooded peat bog in central Europe |
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Authors: | Andrea Kučerová Jan Čermák Nadezhda Nadezhdina Jan Pokorný |
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Institution: | 1. Institute of Botany of the Academy of Sciences of the Czech Republic, Dukelská 135, 379 82, T?eboň, Czech Republic 2. Department of Forest Botany, Dendrology and Geobiocoenology, Mendel University of Agriculture and Forestry, Zemědělská 3, 613 00, Brno, Czech Republic 3. ENKI o.p.s, Dukelská 145, 379 01, T?eboň, Czech Republic
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Abstract: | Transpiration of a central European endemic tree species, Pinus rotundata Link, growing on a wooded peat bog in the Třeboň Basin, Czech Republic, was studied in 1999–2000. Transpiration was measured
by sap flow techniques (heat field deformation method) on individual trees and scaled up to stand level. The radial patterns
of sap flow density showed narrow peaks in the outer part of the xylem, sapwood accounted for 47–60% of the xylem radius and
72–84% of the xylem basal area. Adult trees tolerated well both short-term flooding during the growing season and drawdown
of the water table to a depth of 60 cm below ground level. The maximum and mean daily transpiration rates were 3.0 and 1.8 mm
per day, and were thus similar to published data for Scots pine. The seasonal total transpiration (25 April–20 October 2000,
180 days) amounted to 322 mm, or 62% of the potential evapotranspiration over this period. This canopy transpiration was compensated
by 319 mm of precipitation. The difference between the accumulated precipitation and the accumulated transpiration (derived
from seasonal sap flow measurements) closely mimicked the seasonal course of the water table. |
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