Summary: On the basis of our synecologic examinations carried out on the part of the Maros dam whose slope is of. northern or southern exposure, it can be ascertained that:

(1) The composition of vegetation as well the microclimate consolidated above the substratum are influenced in a high degree by a clay, resp. clayish mad soil of high dead water content.

(2) The difference between the microclimates of dam slopes of northern and southern exposure increases parallelly with the decrease of sun height. The change in temperature takes place faster on a slope of southern exposure.

(3) On dam slopes of southern exposure the change of the species combinations of grass associations is of higher degree owing to the more extreme surface soil conditions.

(4) On the dam side of northern exposure the Arrhenatherum elatius and the Festuca pratensis are the dominant species, while on the southern one the Cynodon dactylon and Poa angustifolia.

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