. Bulletin. Forests and forestry -- United States. EVAPORATION. 65 preventing evaporation than the forest itself. 80 great is the power of the latter that direct observations made in Bavaria and Prussia showed that evaporation from a free surface of water in the forest was onlv 4:0 per cent of that in the open. The presence or absence of leaf mold has a powerful effect on the amount of evaporation from forest Fig. 42.—a snow bank evaporating. San Gabriel Mountains, California. The experiments of Dr. Eberma^'er, a famous German forest meteorologist, showed that evaporation from forest so
. Bulletin. Forests and forestry -- United States. EVAPORATION. 65 preventing evaporation than the forest itself. 80 great is the power of the latter that direct observations made in Bavaria and Prussia showed that evaporation from a free surface of water in the forest was onlv 4:0 per cent of that in the open. The presence or absence of leaf mold has a powerful effect on the amount of evaporation from forest Fig. 42.—a snow bank evaporating. San Gabriel Mountains, California. The experiments of Dr. Eberma^'er, a famous German forest meteorologist, showed that evaporation from forest soil without a hiyer of mold was 47 per cent of that from soil in the open, while with a layer of mold it was less than half as much, or 22 per cent. The greater the altitude above the sea the greater is the effect of the forest in preventing evaporation. This is a powerful reason for preserving mountain forests at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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