The Upper Tisa Valley. Preparatory proposal for Ramsay

Figure 22. The proportion of area covered by forests in the catchment areas of River
Tisa and its tributaries in Romanian territory, before the introduction of cultivation
branches (I), and at present (II) (according to Conek and I Valcea)
altitudinal zonal distribution on the hilly and mountainous areas, both around and
within Hungary. As temperature on average decreases with altitude and precipitation
increases, it is evident that oak trees, which need a great deal of heat and light but only
little water, are replaced at higher altitudes by beech forests which need less heat and
light but more water. At higher altitude beech forests are replaced by simple pine
forests, especially stocks of spruce that prefer wet and cool climate.
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