. Studies in French forestry . Forests and forestry. THINNINGS 109 pine it is invariably the practice to make heavy thinnings ^^ in order that the crowns may be fully developed when tapping for resin begins. These start at 10 years of age and continue every 5 years until tapping to death begins at about 20 years. Jolyet says [155]:. A B Fig. 9 (a). â â Pole stand of spruce at an altitude (west exposure) of 4,590 feet in the communal forest of Beaufort. There are 364 trees per acre, yielding 117 cubic meters (23,000 feet board measure). The thinnings thus far have too much Ught to permit crown
. Studies in French forestry . Forests and forestry. THINNINGS 109 pine it is invariably the practice to make heavy thinnings ^^ in order that the crowns may be fully developed when tapping for resin begins. These start at 10 years of age and continue every 5 years until tapping to death begins at about 20 years. Jolyet says [155]:. A B Fig. 9 (a). â â Pole stand of spruce at an altitude (west exposure) of 4,590 feet in the communal forest of Beaufort. There are 364 trees per acre, yielding 117 cubic meters (23,000 feet board measure). The thinnings thus far have too much Ught to permit crown development. (6). â Spruce and fir running 255 trees and 283 cubic meters (74,000 feet board measure) to the acre, in the Canton du Mont, communal forest of Thones-VUle, at an altitude of 3,120 feet on a west exposure. Thinnings have been insufficient to free the crowns of the most promising trees. ^^ This is entirely proper with maritime pine but with spruce or fir, for example, care should be taken not to open up the stand too suddenly. The chief danger in the United States is of too heavy thinnings because of the need of a large cut at one time to reduce. 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 Woolsey, Theodore Salisbury, 1879-; Greeley, William Buckhout, 1879-. New York : Wiley
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
