. Bulletin (Pennsylvania Department of Forests and Waters), no. 46-50. Forests and forestry. ]G The Beecii-JjIuch-Maple Forest Type in Pennsylvania. 10 20 50 -10 50 /\GE-YE^RS 60 70 BO FtV/. .5. Diagram Showing Average Biamcier Growth of Beech-Birch-ManJe nJ!f \l ^? J'^Z Pennsylvania at Different Ages up to 80 Years. Based Upon 18 Study Plots. The diameter growth appears to continue and often increases somewliat, holdinp: its own for many years after the period of maximum height growtli is passed. As soon as a retardation of growth is manifest in pure birch stands, heart rot begins to develop
. Bulletin (Pennsylvania Department of Forests and Waters), no. 46-50. Forests and forestry. ]G The Beecii-JjIuch-Maple Forest Type in Pennsylvania. 10 20 50 -10 50 /\GE-YE^RS 60 70 BO FtV/. .5. Diagram Showing Average Biamcier Growth of Beech-Birch-ManJe nJ!f \l ^? J'^Z Pennsylvania at Different Ages up to 80 Years. Based Upon 18 Study Plots. The diameter growth appears to continue and often increases somewliat, holdinp: its own for many years after the period of maximum height growtli is passed. As soon as a retardation of growth is manifest in pure birch stands, heart rot begins to develop and such stands go to pieces. This is especially true of the black birch in pure stands. Wild black cherry, white ash, and basswood are not only fast growers, but often attain great size. The large size of wild black cherry in north- central Pennsylvania is attested by planks four feet in width sawed The Beecii-Birch-^Iaple Forest Type in Pennsylvania 17 old-growth cherry logs cut on Cherry Ridge in Potter County. The more "tolerant beech and sugar maple grow to a very large size and oflon attain great age. ^Measurements made on a chance wind-thrown suoar maple on State forest land in Potter County showed that it was almost 30 inches in diameter at breast-height. It was 111 feet tall and 5] feet to the first branch. Its estimated age was approximately 200 years. YIELD OF BEECH-BIRCH-MAPLE FORESTS A good system of forest tendance assures not only continuous but increasing returns from the forest so handled. Before any practical system of forest management can be instituted, it is know the probable yield, which is the amount and character of products it is possible to obtain in a given period of time. Our growth studies reveal that the average fully-stocked natural stand of beech, birch, and maple contains approximately as many cords per acre as it is old in years, within a certain definite period, beginning when stands are from 20-30 years of age and cont
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