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| Titel |
Transpiration of montane Pinus sylvestris L. and Quercus pubescens Willd. forest stands measured with sap flow sensors in NE Spain |
| VerfasserIn |
R. Poyatos, P. Llorens, F. Gallart |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 9, no. 5 ; Nr. 9, no. 5 (2005-10-19), S.493-505 |
| Datensatznummer |
250007040
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| Publikation (Nr.) |
 copernicus.org/hess-9-493-2005.pdf |
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| Zusammenfassung |
| Stand transpiration was measured during the 2003 and 2004 growing seasons
using heat dissipation sap flow sensors in a Scots pine (Pinus sylvestris L.) and a
pubescent oak (Quercus pubescens Willd.) forests located in a montane area of the Eastern
Pyrenees (NE Spain). The first aim of the study was to assess the
differences in quantitative estimates of transpiration (Ec) and the
response to evaporative demand of the two stands. Over the studied period of
2003, characterised by a severe drought episode during the summer, the oak
stand (Ec was only 110 mm compared to the 239 mm transpired by the Scots
pine stand, although the ratio of transpiration to reference
evapotranspiration (Ec/ET0) in the oak stand compares well with the
expected values predicted for low leaf area index (LAI) oak forests in
southern Europe. Scots pine showed a strong reduction in
(Ec/ET0 as the drought developed, whereas pubescent oak was less
affected by soil moisture deficits in the upper soil. As a second objective,
and given the contrasting meteorological conditions between 2003 and 2004
summer periods, the interannual variability of transpiration was studied in
the Scots pine plot. Rainfall during the summer months (June-September) in
2003 was almost 40% less than in the same interval in 2004. Accordingly,
transpiration was also reduced about 25% in 2003. Finally, Scots pine
data from 2003 and 2004 was used to calibrate a simple transpiration model
using ET0 and soil moisture deficit (SMD) as input variables, and
implicitly including stomatal responses to high vapour pressure deficits
(Dd) and soil water status. |
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