The analysis of the dynamic properties of thermal methods of transpiration flow measurement was performed and the measuring system developed, capable of quantitative measurements of fast flow changes (in minutes). The system is specified with a constant automatically maintained temperature difference between the heated and reference points in the measured part of the plant. System’s output signal related to measured quantity is linear. The system has been under longterm testing in full grown trees using the method of heat balance with direct electric heating of the xylem. The results obtained so far may be considered very good.
Heat Balance Fast Change Transpiration Flow Heat Inertia Continual Measurement
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Čermák, J., DEML, M.: [Measuring water transport in woody plants, mainly in adult trees.] In Czech. — Czechoslovak Patent No. 155 622. Praha 1972-74.Google Scholar
Čermák, J., Deml, M., Penka, M.: A new method of sap flow rate determination in trees. — Biol. Plant.15: 171–178, 1973.CrossRefGoogle Scholar
Čermák, J., Kučera, J., Penka, M.: Improvent of the method of sap flow rate determination in full-grown trees based on heat balance with direct electric heating of xylem. — Biol. Plant.18: 105–110, 1976.CrossRefGoogle Scholar
Daum, C. R.: A method for determining water transport in trees. — Ecology48: 425–431, 1967.CrossRefGoogle Scholar
Lange, O. L., Lüsch, R., Schulze, E. D., Kappen, L.: Response of stomata to changes in humidity. — Planta100: 76–86, 1971.CrossRefPubMedGoogle Scholar
Maderski, H. J., Curry, R. B., Chen, L. H.: Effects of irradiance and leaf water deficit on net carbon dioxide assimilation and mesophyll and transport resistances. — Plant Physiol.55: 594–597, 1975.CrossRefGoogle Scholar
Penka, M., Čermák, J., Deml, M.: Water transport estimates in adult trees based on measurements of heat transfer by mass flow. — Acta Univ. Agr. (Brno) Ser. C,42: 3–23, 1973.Google Scholar
Pertttu, K.: Factors affecting needle and leaf temperatures. — Dep. of Reforest. Royal Coll. of Forestry, Res. Notes25: 1–33, 1971.Google Scholar
Pickard, W. F., Puccia, C. J.: A theory of the steady state heat step method of measuring water flux in woody plant stems. — Math. Biosci.14: 1–15, 1972.CrossRefGoogle Scholar
Sheriff, D. W.: A new apparatus for the measurement of sap flux in small shoots with the magnetohydrodynamic technique. — J. exp. Bot.23: 1086–1095, 1972.CrossRefGoogle Scholar
Sheriff, D.W.: A model of plant hydraulics under non-equilibrium conditions. — J. exp. Bot.25: 552–561, 1974.CrossRefGoogle Scholar
Sheriff, D. W., Sinclair, R.: Fluctuations in leaf water balance with a period of 1 to 10 minutes. — Planta113: 215–229, 1973.CrossRefPubMedGoogle Scholar
Zinsmeister, G. E., Dixon, J. R.: Thermal flowmeters: the effect of axial conduction.- Trans. Amer. Soe. Mech. Eng. J. Heat Transfer8: 64–68, 1966.CrossRefGoogle Scholar