. Bulletin. Forests and forestry -- United States. SILVICITLTURAL SYSTEMS. 29 ill by the wind and beechnuts carried and planted by squirrels, and eventually the pure stand of spruce is chang-ed into a mixed forest of various ages. As the trees grow older, some of the spruce ma^^ be destro^^ed by beetles or throw^n by the wind, and some of the broadleaf trees may die from fungous disease. Into the openings made by the death of older members of. Fig. 16.—Lodgepole pine and western larch in selection forest. Northern Idaho. the forest fall the seeds from which vouno-er members spring. So little b
. Bulletin. Forests and forestry -- United States. SILVICITLTURAL SYSTEMS. 29 ill by the wind and beechnuts carried and planted by squirrels, and eventually the pure stand of spruce is chang-ed into a mixed forest of various ages. As the trees grow older, some of the spruce ma^^ be destro^^ed by beetles or throw^n by the wind, and some of the broadleaf trees may die from fungous disease. Into the openings made by the death of older members of. Fig. 16.—Lodgepole pine and western larch in selection forest. Northern Idaho. the forest fall the seeds from which vouno-er members spring. So little b}^ little the forest loses its even-aged character and there comes into existence what is called a Natural or Selection Forest, in which trees of all ap'es are evervwhere closelv mixed too-ether. Most virgin forests are selection 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.
Size: 1414px × 1767px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublisherwashingtongpo, booksubjectforestsandforestryunited
