Internal oxygen levels decrease during the growing season and with increasing stem height

The oxygen levels in the sapwood of Norway spruce [Picea abies Karst. (L.)] trees were measured by GC-MS (gas chromatography - mass spectrometry) as stem growth progressed during the growing season. The measurements were made on 30-year-old, 13-15 m high, trees growing on three plots which were irri...

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Bibliographic Details
Published in:Trees (Berlin, West) West), 2000, Vol.14 (4), p.177-180
Main Author: Eklund, L
Format: Article
Language:English
Subjects:
Absorption. Translocation of ions and substances. Permeability
Agronomy. Soil science and plant productions
atmosphere
Biological and medical sciences
chemical constituents of plants
Drought
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Gas chromatography
Growing season
growth
growth period
height
irrigation
Karst
Mass spectrometry
measurement
Nutrition. Photosynthesis. Respiration. Metabolism
Oxygen
Picea abies
Pine trees
plant characteristics
Plant physiology and development
sapwood
seasonal variation
stems
Transpiration
Trees
Water and solutes. Absorption, translocation and permeability
water stress
Wood
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Summary:The oxygen levels in the sapwood of Norway spruce [Picea abies Karst. (L.)] trees were measured by GC-MS (gas chromatography - mass spectrometry) as stem growth progressed during the growing season. The measurements were made on 30-year-old, 13-15 m high, trees growing on three plots which were irrigated, left undisturbed or subjected to drought. The oxygen measurements were done at 1.5, 4 and 8 m above the ground. The internal oxygen levels dropped to about 5% of the level in air in irrigated trees, 1-3% in control trees and to below 1% in trees subject to drought between mid-July and mid-August. In the trees subjected to drought there where no differences in internal oxygen concentrations between the positions on the tree during the growing season except for a faster increase back to ambient concentration occurring in late August in the 1.5 m position. In trees growing on the two other plots the internal oxygen concentration was higher near the ground than at 4 or 8 m above ground during July and August. At all other dates there were no differences between the positions. The results indicate that there is an oxygen gradient with levels decreasing acropetally, giving indirect support to the hypothesis that oxygen is supplied to the growing stem in the transpiration stream.[PUBLICATION ABSTRACT]
ISSN:0931-1890
1432-2285
DOI:10.1007/PL00009761