Effect of partial cutting in Effect of partial cutting in the virgin stand upon the growth and taper of western yellow pine effectofpartialc540schu Year: 1932 6 University of California—Experiment Station Class 2: Age class, young or thrifty mature (up to 150 years) ; position, usually codominant (rarely isolated or dominant) ; crown length, less than 65 per cent of the total height; crown width, average or narrower; form of top, pointed; vigor, good or moderate. Such trees are usually less than 24 inches in diameter. They are commonly the inside codominant trees of groups. The crowns are sma
Effect of partial cutting in Effect of partial cutting in the virgin stand upon the growth and taper of western yellow pine effectofpartialc540schu Year: 1932 6 University of California—Experiment Station Class 2: Age class, young or thrifty mature (up to 150 years) ; position, usually codominant (rarely isolated or dominant) ; crown length, less than 65 per cent of the total height; crown width, average or narrower; form of top, pointed; vigor, good or moderate. Such trees are usually less than 24 inches in diameter. They are commonly the inside codominant trees of groups. The crowns are smaller and less dense than in trees of the first type. Otherwise they are similar to those of class 1. Class 3: Age class, mature (150-300 years); position, isolated or dominant (rarely codominant) ; crown length, 65 per cent or more of total height; crown width, average or wider; form of top, round; vigor, moderate. 16 2 3 4 7 5 Fig. 1.—Tree classes of western yellow pine. (After Dunning.) These trees are ordinarily between 18 and 40 inches in diameter, depending on site quality. The bark is light brown or yellow, with moderately large smooth plates. The foliage is less dense than in class 1 trees. The top is round, because of slow height growth. The nodes are indistinct, because of incomplete whorls of branches. The branches are nearly all horizontal or drooping. Class 4: Age class, mature (150-300 years); position, usually codominant (rarely isolated or dominant) ; crown length, less than 65 per cent of the total height; crown width, average or narrower; form of top, round; vigor, moderate or poor. These are commonly the inside or codominant trees of this age class. Except for their small, poorly developed crowns and smaller size, they are similar to class 3 trees.
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