Effects of climatic factors on height growth components in austrian black pine pinus nigra ssp nigricans

Guyon, J.P.

Annales des Sciences Forestieres 43(2): 207-226


ISSN/ISBN: 0003-4312
Accession: 005296155

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Weekly (or biweekly) leader shoot growth was assessed over 3 growing seasons (1982-1984) and annual shoot length was measured over 6 years (1979-1984) for a 30 seedlings (age: 11 years) sampled in a naturally regenerated stand of black pine, located at Mont Ventoux in southern France. The number of internodes (stem units) was assessed over the same period (1979-1984). Annual shoot length of a given year appeared as mainly controlled by the number of internodes initiated during the summer of the previous year. Investigations of climatic factors taking place during the assumed initiation stage, have shown a significant correlation between the annual leader shoot length and the cummulated rainfall of June, July and September of the previous year. By contrast, the correlations between temperature factors during the assumed time of initiation and number of initiated internodes of the same year were not significant. The weekly shoot grwoth was significantly related to the average of minimum air temperature of the same period, at the time of height growth, that is to say April and May. Finally the possibility of integrating these results into growth models is discussed.