Summary
This study addresses the question of whether gaseous air pollutants are capable of damaging spruce foliage. For this purpose, several twig pairs of an adult tree in a natural stand from the western part of the Bavarian Forest were supplied with pure and ambient air and gas exchange was monitored. With the exception of insignificant and unexplained differences during winter, the gas exchange of the twigs showed no negative deviation due to the influence of gaseous air pollutants. Because visible damage arises only in older needles, the duration of measurement is not sufficient to exclude a long-term influence of gaseous air pollutants.
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Koch, W., Lautenschlager, K. Photosynthesis and transpiration in the upper crown of a mature spruce in purified and ambient atmosphere in a natural stand. Trees 2, 213–222 (1988). https://doi.org/10.1007/BF00202376
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DOI: https://doi.org/10.1007/BF00202376