. Bulletin. Forests and forestry -- United States. 36 A PRIMER OF FORESTRY. THE RATE OF GROWTH. The rate of growth of differeDt trees often decides which one will survive in the forest. For example, if two intolerant kinds of trees should start together on a burned area or an old field, that one which grew faster in height would overtop the other and destroy it in the end by cutting off the light. Some trees, like the Black Walnut, grow rapidly from their earliest Fig. 34.—Pure forest of Western Yellow Pine in the Black Hills of South Da- kota. The trees here are smaller in size than t
. Bulletin. Forests and forestry -- United States. 36 A PRIMER OF FORESTRY. THE RATE OF GROWTH. The rate of growth of differeDt trees often decides which one will survive in the forest. For example, if two intolerant kinds of trees should start together on a burned area or an old field, that one which grew faster in height would overtop the other and destroy it in the end by cutting off the light. Some trees, like the Black Walnut, grow rapidly from their earliest Fig. 34.—Pure forest of Western Yellow Pine in the Black Hills of South Da- kota. The trees here are smaller in size than those of Montana (see tig. 35), but tlieir jiower of reproduction is much greater. Others grow very slowly for the first few years. The stem of the Longleaf Pine, at 4 years old, is usually not more than 5 inches in length. During this time the roots have been growing instead of the stem. The l^eriod of its rapid growth in height comes later. The place where a tree stands has a great infiuence on its rate of growth. Thus the trees on a hillside are often much smaller than those of equal age in the rich. 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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