Abstract
It seems probable that the fluctuations in plant growth in northern Scandinavia to which Dr. Hustich directs attention are examples of a general phenomenon which will prove to be traceable over the whole of the North Temperate region. Two further examples are shown, in the accompanying figure. The first curve represents the mean diameter increment of eight old trees of oak (Quercus sessiliflora Sals.) growing in unenclosed woodland near Brook in the New Forest, Hampshire, England. Exactly the same trend is shown by rather younger oak (about two hundred years old) in adjacent enclosures, and by pedunculate oak (Q. robur L.) in other parts of the New Forest. The second curve represents the volume increment of mixed silver fir–spruce forest in the Swiss Jura1, in silves per hectare, between successive enumerations made at intervals of approximately five years. (A ‘silve’ is a volume of one cubic metre estimated from the diameter of the trunk and the known average diameter–volume relationship.)
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References
For the Forest of Couvet; from Favre, E., Schweiz. Z. Forstw., 95, 161 (1944).
Kincer, J. E., Biol. Abst., 27, No. 16763 (1946).
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JONES, E. News and Views. Nature 160, 479 (1947). https://doi.org/10.1038/160479a0
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DOI: https://doi.org/10.1038/160479a0
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