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Tree Physiol. 1989 Dec;5(4):507-9.

Pine needle holders for use in gas exchange measurements.

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Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.


Simple holders for positioning pine needles in a gas exchange cuvette are described. The holders make it easy to enclose a standard length of needles in the cuvette in a single plane without mutual shading. The holders also make it possible, following gas exchange measurements, to harvest for further analysis just those needle portions that were enclosed in the leaf chamber. Field observations, which were made with a gas exchange cuvette incorporating the needle holders, on the relationship between carbon exchange rate and photon flux density in loblolly pine (Pinus taeda L.) needles are reported.

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