A study of the dry weights and ages of 57 Salix arctica plants growing in a higharctic region shows that their annual relative growth-rate, which decreases with age, is about one-fifth of the annual relative growth-rate of comparable plants under temperate conditions. Data on the thickness of annual rings indicate that there is a large and progressive increase in annual growth from high-arctic to sub-arctic regions.
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J. W. Wilson (1964) studied this question.