Climatic conditions and habitats in Belső-Somogy, Külső-Somogy and Zselic as vegetation-based landscape regions III. Temperature envelopes of mesic deciduous woodlands

Salamon-Albert, Éva (2012) Climatic conditions and habitats in Belső-Somogy, Külső-Somogy and Zselic as vegetation-based landscape regions III. Temperature envelopes of mesic deciduous woodlands. NATURA SOMOGYIENSIS (22). pp. 27-38. ISSN 1587-1908 (print); 2062-9990 (online)

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Abstract

In our study distribution response to climatic temperature of mesic deciduous woodlands (lowland pedunculate and sessile oak-hornbeam woodlands, beech woodlands) are discussed in the relation of vegetation based landscape regions of South Transdanubia, including Belső-Somogy, Külső-Somogy and Zselic. Selected bioclimatic variables are used to characterize and compare climate envelopes of the habitats by their occurrence. Gaussian probability curves were fitted for yearly, quarterly and some short time range or variability of temperature indexes, representing annual trends, seasonality and extreme or limiting environmental factors in order to generate more biologically meaningful variables. Mesic deciduous woodlands (K) are accurately integrated into the regional habitat envelope (Á-NÉR), according to multipeaks of temperature indices. Among temperature variables, mean annual temperature and maximum one of warmest month is not relevant for habitat differentiation in any way. Mean temperature variables (BIOCLIM-6, -8, -9, -11) are resulted a moderate shifting in the realised range of habitat envelopes in case of pedunculate oak-hornbeam woodlands (K1a) especially, but not in case of sessile oak hornbeam woodlands (K2) and beech woodlands (K5). Separation of pedunculate oak-hornbeam woodlands is well represented by the range and seasonal variables (BIOCLIM-2, -4, -7). This habitat type tolerates high range of diurnal temperature, but a lower one of yearly extremities, as seasonality and annual difference. The most significant temperature effect in the existence of pedunculate oak-hornbeam woodlands is high mean diurnal range as a temperature hardiness and high mean temperature of coldest quarter as a themal limitation.

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