. The practice of silviculture : with particular reference to its application in the United States . Forests and forestry. lOO THE SELECTION METHOD cuttings, growth retarded due to shade and a relatively small increment of valuable material. -iszc-. FlG. 35. A 40-acre portion of a stand of virgin timber to be reproduced tinder the group selection method. Four groups are represented in ^e diagram. Length of rotation is 200 years; length of cutting cycle 50 years. The oldest group is cut clear except for a few trees shown in the diagram left to furnish seed over the central part of the area. Suc
. The practice of silviculture : with particular reference to its application in the United States . Forests and forestry. lOO THE SELECTION METHOD cuttings, growth retarded due to shade and a relatively small increment of valuable material. -iszc-. FlG. 35. A 40-acre portion of a stand of virgin timber to be reproduced tinder the group selection method. Four groups are represented in ^e diagram. Length of rotation is 200 years; length of cutting cycle 50 years. The oldest group is cut clear except for a few trees shown in the diagram left to furnish seed over the central part of the area. Such seed trees are needed because the group is too broad to be adequately reproduced from seed distributed from trees in adjoining groups. The principal difference between this operation and the method of clearcutting the whole stand lies in the difference in size of the unit of management {, the stand). See page 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 Hawley, Ralph C. (Ralph Chipman), 1880-. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
