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A light-weight battery operated infra-red gas analyzer for field measurements of photosynthetic CO₂ exchange

Par Conseil national de recherches du Canada

AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Laboratoire régional des prairies
FormatTexte, Article
Résumé
A commercial infra-red gas analyzer with a solid, sealed optical system has been modified for use in measuring steady-state rates of photosynthetic CO₂ exchange in field conditions. The complete unit, including power supply weighs 20kg and is easily carried and operated by one person. The response to either internal optical calibration or CO₂ differential is linear, only sightly affected by ambient temperature and constant during battery discharge. With a simple clamp-on leaf chamber the rate of CO₂ uptake by pea leaves was constant within 30 s of chamber closure and up to 30 measurements per hour were possible. Rates of CO₂ uptake by leaves of 25 cultivars of pea were normally distributed between 80 and 1300 μg m ⁻² s ⁻¹. Despite large differences in measuring conditions, with 16 measurements each, cultivar means differing by only 80 μg m ⁻² s ⁻¹ could be resolved.
Date de publication
Maison d’éditionCzech Academy of Sciences
Institute of Experimental Botany
Condition d’accès
  • Copie papier conservée au CNRC. Version numérique disponible sur demande. Contactez NRC.NSL-BSN.CNRC@nrc-cnrc.gc.ca
Dans
  • Photosynthetica 13, nº 4 (1979) : 459–466.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 17793
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Identificateur de l’enregistrementaeeeb2b7-ad74-40dd-90e6-32391b222f74
Enregistrement créé2024-02-27
Enregistrement modifié2024-02-27
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