Hydraulic architecture and water use of selected species from a lower montane forest in Panama |
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Authors: | G Zotz M T Tyree S Patiño M R Carlton |
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Institution: | Julius-von-Sachs-Institut für Biowissenschaften mit Botanischem Garten der Universit?t Würzburg, Lehrstuhl für Botanik II, Mittlerer Ballenbergweg 64, D-97082 Würzburg, Germany, DE Smithsonian Tropical Research Institute, Apdo. 2072, Balboa, Republic of Panama, PA Department of Botany and Plant Pathology, Michigan State University, East Lansing, MI 48824-1312 USA, US
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Abstract: | Plant water relations of nine woody species were studied in a lower montane rain forest in Panama. These data provide a partial
test of the hypothesis that hydraulic architecture of lower montane species might limit transpiration and thus leaf size or
nutrient transport (as suggested by J. Cavelier and E. G. Leigh, respectively). Diurnal variation in leaf transpiration was
closely correlated with changes in net radiation. Peak transpiration rates (7 × 10–5 kg s–1 m–2) were as high as peak transpiration rates from tropical lowland forests but mean daily water use 0.39 ± 0.08 (SEM) kg m–2 day–1] were mostly lower than comparable data from tropical lowland forests. Thus transpiration rates are sufficiently high for
sufficiently long periods to make it unlikely that nutrient transport is limited by transpiration. Another objective of this
study was a comparison of two different methods to measure hydraulic conductance (Kh = flow rate per unit pressure gradient) and leaf specific conductance of stem segments (KL = Kh/leaf area distal to the segment). The results obtained with the traditional conductivity apparatus and the high pressure
flow meter method, yielded similar results in six out of seven cases.
Received: 20 March / Accepted: 21 October 1997 |
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Keywords: | Hydraulic architecture Transpiration Lower montane forest Cloud forest |
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