Abstract
The study investigates and analysis the effect of climate factors, including monthly total rainfall, temperature and monthly average humidity, on cambium activity of Pinus krempfii in Bidoup - Nui Ba National Park, VietNam. The result showed that cambium activity of this species changes with the seasons significantly, which is slow or dormant in the dry season (from January to April and December) and strong in the rainy season (May to November). The correlation analysis between the cambium’s numbers and climatic factors showed that there are very high positive correlations for humidity (r = 0.842) and temperature (r = 0.788); there is a rather high positive correlation for rainfall (r = 0.679). The study’s result reveals the climate’s conditions which are suitable to diameter’s growth of the species, so it contributes to the conservation’s efforts of this rare species.
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