Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Čermák, J., DEML, M.: [Measuring water transport in woody plants, mainly in adult trees.] In Czech. — Czechoslovak Patent No. 155 622. Praha 1972-74.
Čermák, J., Deml, M., Penka, M.: A new method of sap flow rate determination in trees. — Biol. Plant.15: 171–178, 1973.
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.
Daum, C. R.: A method for determining water transport in trees. — Ecology48: 425–431, 1967.
Farquhar, G. D., Cowan, I. R.: Oscillations in stomatal conductance. The influence of environmental gain. — Plant Physiol.54: 769–772, 1974.
Lange, O. L., Lüsch, R., Schulze, E. D., Kappen, L.: Response of stomata to changes in humidity. — Planta100: 76–86, 1971.
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.
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.
Pertttu, K.: Factors affecting needle and leaf temperatures. — Dep. of Reforest. Royal Coll. of Forestry, Res. Notes25: 1–33, 1971.
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.
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.
Sheriff, D.W.: A model of plant hydraulics under non-equilibrium conditions. — J. exp. Bot.25: 552–561, 1974.
Sheriff, D. W., Sinclair, R.: Fluctuations in leaf water balance with a period of 1 to 10 minutes. — Planta113: 215–229, 1973.
Zinsmeister, G. E., Dixon, J. R.: Thermal flowmeters: the effect of axial conduction.- Trans. Amer. Soe. Mech. Eng. J. Heat Transfer8: 64–68, 1966.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ktjčera, J., Čermák, J. & Penka, M. Improved thermal method of continual recording the transpiration flow rate dynamics. Biol Plant 19, 413–420 (1977). https://doi.org/10.1007/BF02922976
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02922976