Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 1989. 19/6. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 19)

Sándor Orbán: Analysis of some plant communities based on the bryophyte layer

- 197 SÁNDOR ORMÁN ANALYSIS OF SOME PLANT GUMMUNX TILS BASED ON THL ÍJRYOPIIYTE LAYER ABSTRACT: The floristie composition of 11 plant conmunities was examined by cluster analysis based on the frecuency and life strategies of bryophytes. The dendrograms based on floristie and life strategy data show that the bryophyte layers of grassy and woody communities are different. On the other hand, the brynphyte flora and the strategy spectrum of ecologically similar comnunitier, closely agree. INTRODUCTION The project "The ecological and coenological connections of the lile strategies of bryophytes" is sponsored by the Hungarian Academy of Sciences. The present paper gives some coenolngical results of the above mentioned investigations. It is documented by previous studies that the bryophytes are useful indicators of the environment in which they are present (Zólyomi 1931, Boros 1968, Benson-Evans 1961, Darkman 1950, Giminghnm-0irse 1957, Simon 1970, Simon—

Szerényi 1975, Slack 1977, Orbán 1904, 1907), and results are more exact if the investigations are made on the basis of the life strategies of bryophytes occurring in the communities (Orbán 1904 a, b)

. For the analysis of vegetation types a frequently' used method is cluster analysis (see, e.g. Feoli--Ganis 1985, Feoli--0rlóci—Scimone 1905, Podani 1985, etc.). In the bryological research this niithod is employed for taxonomical investigations (e.g., Dull--Hermanns and Diill 1985, etc.), but analyses of vegetation types were also made by the author (Orbán 1984). Results of the latter investigations showed that the