Site classification vs. wood production: a case study based on Silver fir growth dynamics in the Western Carpathians
2011
Bosela, M.,Narodne Lesnicke Centrum, Zvolen (Slovak Republic). Lesnicky Vyskumny Ustav | Petras, R.,Narodne Lesnicke Centrum, Zvolen (Slovak Republic). Lesnicky Vyskumny Ustav | Smelko, S.,Narodne Lesnicke Centrum, Zvolen (Slovak Republic). Lesnicky Vyskumny Ustav
We analysed wood production and silver fir growth ability within site units defined in the site classification that is currently used in the Western Carpathians (Slovakia). Research plots established for development of a yield model for silver fir in the sixties were used. The Korf growth equation was used to model fir growth, since it showed the best fit to the data compared to other equations. The test of residual variance of the growth models and the test of regression coefficients of the growth models were employed to investigate the differences in top-height growth of trees occurring on different sites. Our results showed a very high variability of the top height development within the site units. Nevertheless, two main groups of sites being different from each other were recognized. Significant differences in the height growth of fir between site units were found mainly in mature stands starting at the age of 60, which could be due to different soil depth and nutrient regime. In conclusion, the actual classification system used in the Western Carpathians does not satisfy the needs of management planning, sice it does not reflect the production capability of sites.
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