SYN - AND AUTOECOLOGICAL STUDIES IN THE OSTRYA CARPINIFOLIA- AND QUERCUS PUBESCENS - AREA NEAR BOZEN (SÜDTIROL - ITALY). Measurements of leaf diffusion resistance, water saturation deficit and water potential were carried out on Teucrium chamaedrys, Artemisia alba, Helianthemum nummularium ssp. ovatum in a dry grassland community.
INVESTIGATION OF THE WATER RELATIONS OF OSTRYA CARPINIFOLIA AND SOME OTHER TREES AND SHRUBS IN THE SURROUNDJNGS OF RIJEKA.
This paper presents the results of investigations of transpiration (Tr) and water saturation deficit (Dw) of some tree and shrub species in the decidous region of the Croatian Coast in wider surroundings of Rijeka. Leaves of deciduous shrub species in Carpinetum orientalis and Seslerio-Fagetum usually transpired more than leaves of investigated tree species. Among tree species in the association Carpinetum orientalis, Ostrya carpinifolia, and Carpinus orientalis had the lowest Tr-Values and the smallest daily and seasonal amplitudes as well as low water deficit and narrow amplitude at the same time. On the opposite, Fraxinus ornus transpired much more intensively in convenient conditions, while it decreased transpiration very much with more severe drought and at the same time had a considerably increased water deficit, showing a high amplitude during the vegetational season. Consequently, Fraxinus ornus was more similar to the shrub species than to the investigated decidous tree species.
THE OSTRYA-ASSOCIATIONS IN THE SUBMEDITERRANEAN VEGETATION COMPLEXES. In
Italy and in the neighbouring countries, a dozen landscape systems have been described. Several of them including wood-associations with dominating Ostrya carpinifolia. The ecological optimum of Ostrya can be identified with the areas where Ostrya is most frequent i.e. SE-Alps and N-Apennines. Ostrya also appears in Southern Italy, but it is rare and segregated in marginal habitats. It may be assumed that Ostrya associations are primary only in these last habitats, while the diffused Ostrya formations of SE-Alps and N-Apennines can be regarded as secondary.