Distribution of annual and biennial needles in biennial branches of undamaged trees of Scotch pine in the focus of Diprion рini L.
Journal Title: Лісівництво і агролісомеліорація - Year 2012, Vol 120, Issue
Abstract
Measurement and statistical analysis of biometric parameters of biennial branches, number of annual and biennial needles and respective dry mass by crown layers and separately for central and lateral branches was carried out for undamaged Scotch pine trees of 80 years old in the focus of Diprion pini L. It was proved that correlation coefficients between dry mass of both annual and biennial needles and other examined parameters have no significant differences both for different crown layers and for samples from central and lateral branches. Parameters of regression equations are evaluated and results are plotted. They may be used for prediction of dry mass of annual and biennial needles as well as their number per biennial branch by length of increment of former year, and prediction of dry mass of annual and biennial needles by number of respective needles. Obtained results may be used for optimization of methods of assessment of pine sawflies and evaluation the level of crown damage.
Authors and Affiliations
O. Andreeva
Keywords
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