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22: 255–259. kirdyanov, a., hughes, m., vaganov, e., schweingruber, f., and silkin, p. 2003. the importance of early summer temperature and date of snow melt for tree growth in the siberian subarctic.
we propose that there was an improvement in water-use efficiency arising from a stimulation of photosynthesis and declining stomatal conductance as a consequence of the increasing co2 concentration in the atmosphere and that this effect was enhanced by a relatively high input of n due to the proximity of n emission sources.