Abstract
Stem respiration of adult beech (Fagus sylvatica L.) trees was measured in the field in eastern France at several levels in the crown and along the stem. Strong variations in respiration rates throughout the season and within the trees were mainly caused by gradients in stem tem- perature, growth rates and distribution of living cells. The higher respiration rates, were measured in the upper crown. During the non-growing season, maintenance respiration ranged between 7.2 and 528 µmol m -3 s -1 at breast height and in the upper crown, respectively. Q10 increased along the stem from 1.3 at breast height to 2.0 in the upper crown. There was a linear relationship between (N) and the percentage of living cells in the wood, but respiration increased strongly with (N). Growth respiration accounted for 45-76% of annual stem respiration, and the growth respiration coefficient was close to 0.2 g C respired g -1 C fixed.
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