The Measurement of the Rate of Water‐vapor Loss From Leaves Under Standard Conditions

Meyer, Bernard S.

doi:10.1002/j.1537-2197.1927.tb04869.x

American J of Botany

1927

DOI: 10.1002/j.1537-2197.1927.tb04869.x

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The Measurement of the Rate of Water‐vapor Loss From Leaves Under Standard Conditions

Bernard S. Meyer¹

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1931

1956

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Cited by 9 publications

(2 citation statements)

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“…Numerous studies of plant transpiration have been made with this procedure (4,8,13). MEYER (9) and BLAYDES (1,2,3) have brought out a number of practical possibilities and limitations of the method and have emphasized that it does not measure absolute rates of transpiration that occur normally, but that the rates determined depend on certain abnormal conditions which may be imposed on the transpiring leaf surface by the cobalt chloride test paper. They considered that by careful standardization of the test paper the relative rates of water loss may be determined in a quantitative manner.…”

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A Critical Study of the Cobalt Chloride Method of Measuring Transpiration

Bailey

Rothacher²,

Cummings³

1952

Plant Physiol.

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In recent years increasing awareness of the importance of water in our national economy has focused attention on the significance of forests in this important phase of conservation of our natural resources. Much has been written in the past 30 years concerning various aspects of the water relations of woody plants, yet available data concerning total water loss from trees and forests are inadequate. This inadequacy is apparent when it is realized that many of our present-day estimates are based on experiments conducted by voN H6HNEL prior to 1900 in which potted seedlings were used as test plants (6, 7). Such estimates have little value for appraising seasonal use of water by forests. The present study was undertaken to supply needed information concerning a measurement procedure which could be used with facility under field conditions to give reliable estimates of transpiration by forests of the Tennessee Valley.Methods of measuring transpiration have been summarized from the literature (5, 10) and need not be described here. All of these methods are subject to criticism either on theoretical grounds or on the basis of operational difficulties. Most of them are impractical under field conditions, especially when applied to tree species. This is illustrated in the studies of MINCKLER (11) in which the water loss of 12 trees of five species was determined by an adaptation of the air-stream method. This procedure, one of the most acceptable under laboratory conditions, is quite cumbersome in application to field conditions. The cobalt chloride procedure, first proposed by Stahl, has particular appeal for field studies since it requires no elaborate equipment and determinations can be made simply and quickly (4). Numerous studies of plant transpiration have been made with this procedure (4,8,13). MEYER (9) and BLAYDES (1, 2, 3) have brought out a number of practical possibilities and limitations of the method and have emphasized that it does not measure absolute rates of transpiration that occur normally, but that the rates determined depend on certain abnormal conditions which may be imposed on the transpiring leaf surface by the cobalt chloride test paper. They considered that by careful standardization of the test paper the relative rates of

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“…Experimental procedures Cobalt chloride paper was prepared by a method similar to that described by MEYER (9). Several circular filter papers 11 cm.…”

mentioning

confidence: 99%

A Critical Study of the Cobalt Chloride Method of Measuring Transpiration

Bailey

Rothacher²,

Cummings³

1952

Plant Physiol.

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Stomatal Behavior in Inbred and Hybrid Maize

Clark

Hecht

Curtis

et al. 1941

American J of Botany

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Weitere Beiträge zur Transpirationsanalyse. II. Eine Metho de der differenzierten Transpirationsbestimmung in unbewegter Luft

Seybold¹,

Füsser²

1931

Planta

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A. Einleitung.Der Fortschritt der Transpirationsanalyse ist nor allem yon der eindeutigen Definition eines zuverl~ssigen MaBsystems und einer einwandfreien Apparatur abh~ngig. Mit dem reehnerisch zu behandelnden Begriff des Transpirationswiderstandes (SEYBOLD 1929) ist eine auf physikalischer Grundlage aufgebaute Definition gegeben, dureh welehe der langj~hrige Streit fiber die ,,St~trke der Transpiration" verschiedener Pflanzenarten erledigt ist. Die im folgenden beschriebene Methode baut sich auf den Begriff des Transpirationswiderstandes auf und kann als spezielle Apparatur zur Berechnung der Wasserpermeabilit~t yon Blattepidermen angesehen werden, zumal das Transpirationsproblem zum Tefl in das Permeabilit~tsproblem eingeht.Naehdem die Theorie der Transpirationsanalyse in den letzten Jahren dutch die Arbeiten yon SIERP u. SEYBOLD (1927SEYBOLD ( und 1929, SEYBOLD (1927SEYBOLD ( , 1929SEYBOLD ( a, 1929SEYBOLD ( b und 1930, S•YBOLD U. VAN D~R WEY (1929) und HUBER (1929 urict 1930 hinreichend klargelegt wurde, ist die Konstruktion einer Apparatur erforderlieh, welehe der theoretisehen Grundlage der Analyse entspricht.Wenn wir yon den Modellversuehen der angefiihrten Arbeiten absehen, so l~Bt sieh sagen, dab die angewandten Methoden zur Ermittlung der pflanzlichen Transpiration in v~elen F~llen sich als unzureichend erweisen.Vor allem konnten Ergebnisse, die mit abgesehnittenen Sprossen gewonnen wurden, nicht zuverl~ssig sein. Die physikalische Komponente der Transpiration ist allein sehon dutch das Abschneiden yon Sprossen nieht vollkommen eindeutig erfal~bar, well die Koh~sion des Wassers in den Leitungsbahnen mehr oder weniger ver~ndert wird. In welchem Mal~e das Absehneiden auf die Transpiration yon Einflul~ ist, soll hier ebensowenig erSrtert werden, wie die Frage einer hinreiehenden Wasserversorgung abgeschnittener, in Wasser stehender Sprosse.

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The Measurement of the Rate of Water‐vapor Loss From Leaves Under Standard Conditions

Cited by 9 publications

References 4 publications

A Critical Study of the Cobalt Chloride Method of Measuring Transpiration

A Critical Study of the Cobalt Chloride Method of Measuring Transpiration

Stomatal Behavior in Inbred and Hybrid Maize

Weitere Beiträge zur Transpirationsanalyse. II. Eine Metho de der differenzierten Transpirationsbestimmung in unbewegter Luft

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