Ábrahám Levente (szerk.): Válogatott tanulmányok VII. - Natura Somogyiensis 22. (Kaposvár, 2012)
Salamon-Albert É.: 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 27-38 Kaposvár, 2012 Climatic conditions and habitats in Belső-Somogy, Külső-Somogy and Zselic as vegetation-based landscape regions III. Temperature envelopes of mesic deciduous woodlands Éva Salamon-Albert University of Pécs, Biological Institute, Department of Systematic and Ecological Botany Pécsi Tudományegyetem Biológiai Intézet Növényrendszertani és Geobotanikai Tanszék, H-7624 Pécs, Ifjúság útja 6.; e-mail: albert@gamma.ttk.pte.hu Salamon-Albert, É.: Climatic conditions and habitats in Belső-Somogy, Külső-Somogy and Zselic as vegetation-based landscape regions III. Temperature envelopes of mesic deciduous woodlands. Abstract: In our study distribution response to climatic temperature of mesic deciduous woodlands (lowland pedunculate and sessile oak-hombeam 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-hombeam woodlands (Kla) especially, but not in case of sessile oak hornbeam woodlands (K2) and beech woodlands (K5). Separation of pedunculate oak-hombeam 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-hombeam woodlands is high mean diurnal range as a temperature hardiness and high mean temperature of coldest quarter as a themal limitation. Keywords: habitat distribution modelling (HDM), climate envelope, MÉTA database, mesic deciduous woodlands, landscape ecology Introduction Climate elements effecting presence and distribution of semi-natural habitats by a great extent is a hot topic of current ecological research, using e.g. bioclimatic envelope models for pattem analysis and predictions (Botkin et al. 2007). Climate-vegetation relations were widely analysed under different spatial scales connected with some vegetation classification according to bioms, continents, countries and regions in Europe or in the USA (Ozenda and Borel 2000, Hőssel et al. 2003, Piovesan et al 2005,
