Michigan Manual of Forestry; Volume 2

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. 1916 edition. Excerpt: ...average cost value of growing stock per acre: do] 75+ 10) (1.0280--1V-10(1.02'--1)--20(1.0220--1), ...; 8o(1.02_l)-(75 + 1o)=$131 and for 16,000 acres about $2,096,000. 3. Simplification of this formula by substituting Se(1.opr--1) for Sc(1.opr--1) results in the same form found for o--Ge so that: o-(r ... Read More

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. 1916 edition. Excerpt: ...average cost value of growing stock per acre: do] 75+ 10) (1.0280--1V-10(1.02'--1)--20(1.0220--1), ...; 8o(1.02_l)-(75 + 1o)=$131 and for 16,000 acres about $2,096,000. 3. Simplification of this formula by substituting Se(1.opr--1) for Sc(1.opr--1) results in the same form found for o--Ge so that: o-(r-i)Gc =-(r-OGe when Se is employed as the value of the land in place of Sc, or Ss. H. VALUE OF THE GROWING STOCK IN THE ALLAGED OR MANY-AGED FOREST. Two cases arise: the regulated and the irregular forest. a. The stand is truly all-aged and regular as in the case of a well managed selection forest. Here old and young are in proper proportion, all age classes are represented and occupy equal areas. The difference between the growing stock of this forest and that of a forest of even aged stands is merely in the distribution of old VALUE OF ALL-AGED STAND 71 and young on the ground. Theoretically at least, the following holds: if the rotation is 120 years, the area 3,600 acres, the period of return 20 years, so that each year 180 acres are cut over, eachrotation one of the 180 acre lots contains six age classes, and on return the 3,600 acres all age classes, from 1--120 year old stuff, are represented, provided reproduction is secured promptly, as is here assumed. On each 180-acre lot the trees of the six age classes would s-/i occupy the same amount of ground, 30 acres, not in separated areas, but mixed, so that every acre would have old, young and middle aged stuff, i. e., trees of all six age classes. If this forest were cut over every ten years, each lot would have twelve age classes, and if cut over every year every lot should contain every age class from one to one hundred and twenty years old. The work, expenses and income from this... Read Less