Ábrahám Levente (szerk.): Válogatott tanulmányok III. - Natura Somogyiensis 12. (Kaposvár, 2008)

Salamon-Albert Éva-Horváth Ferenc: Vegetation of Külső-Somogy in Hungary I.

(P2b, 1068 ha, 2,5%) as a secondary habitat type. Wooded pastures and sweet chestnut woodlands (P45, 48 ha, 0,1%) and extensive orchards with ancient cultivars (P7, 86 ha, 0,2%) are included in P habitat group as habitat fragments with small extensions. Swamp and riverine woodlands influenced by permanent water table have very small proportion in spite of their importance in potential vegetation (J habitat group, 281 ha, 0,7%). The main habitat types in the group are riverine ash-alder woodlands (J5, 200 ha, 0,5%), in small extension alder and ash swamp woodlands (J2, 43 ha, 0,1%), Salix cinerea mires (Jla, 14 ha) and riverine oak-elm-ash woodlands (J6, 23 ha) are occured in KülsőSomogy region. Roughly estimated area of habitat types or groups and occurrences of them could give information about vegetation patch statistics for 99 quadrats and average occurence per quadrat (Fig. 3). In the database 5341 occurrences were recorded for 23 woody habitat types exsisting at least with one case in every valid quadrat. In the first series we could analyse the occurrence percentage for the habitats and groups. The most distinct and related vegetation patches are revealed in case of R habitat group (2501 cases, 47%») especially. The number of occurrences and their proportion decreases in order to RD (811 cases, 15%), RB (706 cases, 13%), RC (678 cases, 13%) and RA (306 cases, 5,7%). The second large ocurrence and percentage of habitat patches have in mesic woodlands (1147 cases, 21%) with oak-hornbeam woodlands (K2) which have the greatest occurrence number and proportion (761 cases, 21%). Calculated data of P habitat group are comparable to the statistics of K group (1104 cases, 21%») with the largest occurrence proportion of mesic shrub vegetation (P2a, 698 cases, 13%). Occurrence proportion of dry deciduous woodlands habitat group is less than 10% (492 cases) with the greatest occurence percentage of turkey oak-sessile oak woodlands (L2a, 379 cases, 7%). Patches proportion of J and M habitat groups are not remarkable. In the second series average number of patches per quadrat for valid stands could be compared among habitat types and groups. Among habitat groups K, R and P have the largest occurrence number per quadrat (11,4; 10,8; 5,7), M habitat types (2,4) have the lowest one. Between Fig. 3. Patches distribution of woody habitat types and habitat groups in Külső-Somogy. Occurrence: percentage of cases in 99 quadrats, occurrence/quadrat: mean number of patches per valid quadrats with standard deviation in habitat groups