Among these,
the following indicators of forest soil quality have often been used: organic matter and the C/N ratio (e.g., Edmonds and Chappell, 1994, Lavoie et al., 2007 and Laubhanna et al., 2009), soil texture (e.g., Bravo and Montero, 2001, Jennifer and Gower, 2006 and Martin and Gower, 2006), nutrient status (e.g., Wang, 1995, Wang and Klinka, 1996 and Pinto et al., 2008), cation exchange capacity (Jokela et al., 1988 and Bravo and Montero, 2001), pH value (e.g., Pinto et al., 2008 and Viet et al., 2013a) and humus forms (e.g., Kõlli, 2002, Bergès et al., 2005 and Ponge Venetoclax concentration and Chevalier, 2006). However, the applicability of these properties is often limited by the cost and time needed for the assessment (Schoenholtz et al., 2000). Frequently, especially in dry areas and in forests growing on shallow soils, water stored in the soil can be the overriding soil quality parameter (Katzensteiner, 2000, Witty et al., 2003 and Vilhar MEK inhibitor et al., 2005). Silver fir growth in relation to different environmental factors had already been studied in the past. Becker (1982) showed that silver fir stand productivity is positively related to rainfall, negatively related to temperature and poorly correlated with site nutritional quality. This was also reported by Pinto et al. (2007) for the radial growth. Lebourgeois, 2007 and Lebourgeois et al., 2010 reported about sensitivity of shade tolerant silver fir species to frost and drought. Nitrogen supply
(expressed as C/N ratio) was correlated with radial growth only at the beginning of the 20th century while the positive effect of nitrogen is disappearing today due to eutrophication during 20th century. However, (Pinto et al., 2008) found nutritional resources as the factor determining silver fir site index. This study also revealed that radial growth of silver fir is not determined by the site’s level of exchangeable Diflunisal bases (Pinto et al., 2007). Piskernik, 1985 and Pinto et al., 2007 showed that radial growth of silver fir is strongly positively correlated with available soil water. Variables related to water availability showed a positive effect also on height growth
(site index), but only when water is a height growth limiting factor (lower precipitation and higher temperature) (Pinto et al., 2008). They also found negative effect of exchangeable aluminium in the B horizon on ring width. Study of growth and yield characteristics of silver fir in Slovenia (Kadunc, 2010) revealed that site index of silver fir is positively correlated with concave topography and east aspect. Significant effect of elevation on silver fir growth has been confirmed by Keller, 1978, Pinto et al., 2007, Pinto et al., 2008 and Kadunc, 2010. Silver fir is also very sensitive to SO2 emissions, resulting in significant reduction of tree ring widths (Elling et al., 2009). All these studies were carried out in a larger area or on wide ecological amplitude or soil conditions.
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