Ábrahám Levente (szerk.): Válogatott tanulmányok V. - Natura Somogyiensis 17. (Kaposvár, 2010)

SALAMON-ALBERT, É., ORTMANN-AJKAI, A., HORVÁTH, F., & MORSCHHAUSER, T.: Klíma és élőhelytípusok Belső-Somogy, Külső-Somogy és Zselic vegetáció alapú tájegységeiben I. Klímafelszínek és az erdei élőhelyek éghajlati tartománya

SALAMON-ALBERT É., ORTMANN-AJKAI A., HORVÁTH F. & MORSCHHAUSER T. 67 glia.hu/atlasz.html, MERSICH et al 2001). Set of calculated variables are reported as the regional climatic surface, BIOCLIM 1 to 11 from the temperature data, BIOCLIM 12 to 19 from the precipitation data, considering the elevation correction. Calculation of bioclimatic variables was carried out by the Institute of Ecology and Botany of the Hungarian Academy of Sciences (Czúcz et al 2007). Table 1 reports main descriptive statistics for the analysed temperature and precipitation data as bioclimatic variables for the vegetation-based regions. Meaning of variables: BIOCLIM 1 = Annual mean temperature, BIOCLIM 2 = Mean diurnal range of temperature, BIOCLIM 3 = Isothermality, BIOCLIM 4 = Temperature seasonality as standard deviation * 100, BIOCLIM 5 = Maximum temperature of Warmest Month, BIOCLIM 6 = Minimum temperature of Coldest Month, BIOCLIM 7 = Temperature annual range, BIOCLIM 8 = Mean temperature of Wettest Quarter, BIOCLIM 9 = Mean temperature of Driest Quarter, BIOCLIM 10 = Mean temperature of Warmest Quarter, BIOCLIM 11 = Mean temperature of Coldest Quarter, BIOCLIM 12 = Annual mean precipitation, BIOCLIM 13 = Precipitation of Wettest Month, BIOCLIM 14 = Precipitation of Driest Month, BIOCLIM 15 = Precipitation seasonality as coefficient of variation, BIOCLIM 16 = Precipitation of Wettest Quarter, BIOCLIM 17 = Precipitation of Driest Quarter, BIOCLIM 18 = Precipitation of Warmest Quarter, BIOCLIM 19 = Precipitation of Coldest Quarter. A quarter is a period of three months, lA of the year. Among them BIOCLIM 1 and 12 represent annual trends, BIOCLIM 2, 3, 4, 7 and 15 represent any kind of seasonality, BIOCLIM 5, 6, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19 represent extreme or limiting environmental factors for vegetation distribution. MÉTA habitats MÉTA project (2002-2006) was a systematic habitat mapping of the Hungarian vegetation on landscape scale integrated with spatial and geographical information (

MOLNÁR et al 2007). MÉTA quadrates (35 km

2) are the organisational and constructing units, divided into hexagons (35 ha) per each for higher resolution, as the basic units of MÉTA tables and databases. In our study, habitat types and bioclimatic variables were assigned to finer spatial scale for cc 16300 hexagons of 163 quadrates. In total 57 MÉTA habitat types were identified in the three regions, including woody and non-woody habitats with natural, semi-natural and managed status. They represent more than half of the total number of habitats listed for Hungary (66.3%). In our study we focused only on significant woody habitat types, occurring at least 5 percent of hexagons. Binary data of habitat occurrence were used for the analyses. Significant woody habitat types in the regions are: riverine and swamp woodlands signed by J, mesic deciduous woodlands signed by K, closed dry and deciduous woodlands signed by L and other tree dominated habitats signed by R. P = bush vegetation, woodland margins, wooded pastures, sweet chesnut forests and extensive orchards. English nomenclature of habitats by MOLNÁR et al (2008), Hungarian names are by BÖLÖNI et al (2003). Regarding woody vegetation types (Fig.l), riverine and swamp woodlands (J) are abundant only in Belső-Somogy, mostly streamside alder groves (J5, 8.7%) and, in a lesser extent, alder swamps (J2, 2.4%). Mesic deciduous woodlands are the most widespread as the original zonal vegetation in out study area, preserved best in Zselic (14%), half of it in the other two regions. In Belső-Somogy dominate hornbeam-pedunculate oak forests (Kla, 8%), in Külső-Somogy and Zselic hornbeam-sessile oak forest (K2, 4.3% and 8.1%, accordingly); in Zselic beech forests (K5) are also important (5.4%). Closed dry deciduous forests (L) are in a marginal zonal position in Külső-Somogy, but most of them are disappeared, their actual coverage is about 3%. Secondary woody types