Bulletin Volume 276-300

Bulletin Volume 276-300

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...in terms of the crown classes and species to be removed. If preferred, the approximate percentage of the merchantable timber corresponding to the species and crown classes to be removed may be added. Unless it increases the danger of wind throw or results in loss to the operator, marking will be lighter in stands containing a large proportion of thrifty young and middle-aged timber, and heavier in stands containing a large proportion of mature and overmature timber; except that on steep slopes the cutting should be very light. When crowded groups of small trees occur among older timber they will be thinned, provided they contain marketable material. Brush should be lopped and scattered. YOUNQ-OROWTH HARDWOODS (EVEN-AGE1): In young hardwoods, cxittings should be restricted to (1) improvement and increment thinnings in stands of the tolerant, longer-lived species, and in immature stands of intolerant, shortlived species (aspen and paper birch), wherever merchantable material can be removed practicably; and (2) to clear cuttings of aspen and paper birch which have reached physical maturity. (1) The thinnings should remove (a) merchantable defective trees, (6) merchantable trees of the less valuable species in the stand, (c) not over 50 per cent of the trees comprising the dominant, codominant, and intermediate crown classes, and (d) all mercliantable trees of the subordinate crown classes. The degree of tliinning should depend upon the stem density of the stand and the consequent degree of windfirmness which the individuals will bo likely to possess when the stand is opened up. This must bo judged on the ground by the person conducting the marking. Brush should be lopped and scattered. (2) To reproduce these stands in situ early spring clear...show more

Product details

  • Paperback | 326 pages
  • 189 x 246 x 17mm | 585g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236827953
  • 9781236827951