Biodiversity of Eastern Rhodopes: (Bulgaria and Greece) by Petar Beron, Alexi Popov
By Petar Beron, Alexi Popov
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E. more than 1/5 of their annual discharge flows within just one month and for the Byala Reka River it takes less than a month. This fact can be partially explained with the increasing share of snowfalls in its catchment area which in combination with the rapid snow melt, rainfalls or abrupt foehn-related warming leads to extremely high water level in the river. During the summer low waters, however, these rivers are notable for their extremely small discharge, which has reached its record low level in the Byala Reka River (Table 6).
These soils are developed upon volcanic tuffs, containing volcanic glass, volcanic ash and/or lava materials composed of andesites, rhyolites or diabase. They occur fragmentarily in the Stramni Rid northern parts (in close proximity to the village of Nanovitsa), in the Zhalti Dyal eastern branches (near the Ustra village), in the surroundings of Kardjali, etc. The Zhalti Dyal is almost entirely (except for its eastern slopes facing the Varbitsa Valley) involved in the so called Western Rhodopes Zone of the Mountain Province within the Mediterranean Soil Region, remarkable for its brown mountain-forest soils (dystric, CMd) from the so called metamorphic soils – Cambisols (CM).
However, the increase of rainfalls with height is insignificant. A typical example are the stations in the northern foothill of Gyumyurdzhinski Snezhnik and the border Ardinski Dyal, connected with it to the west, where the annual precipitation exceeds 1000 mm at different altitudes (Table 5). In the remaining regions of the Eastern Rhodopes, the precipitation drops down to 600 mm northwards. In spite of the fact that the northern slopes and foothills become lower, they receive more precipitation.