Treesearch

Michigan loggers cut 173.8 million cubic feet of industrial roundwood products in 1969. Ninety percent was pulpwood and saw logs. Production is shifting from softwoods to hardwoods. The number of active primary wood-using mills declined rapidly from 1954 to 1969, but production per mill has expanded.

Presents 1970 pulpwood production and receipt data for the Lake States and Central States. Pulpwood production for the Lake States is given by species for each county, and production by Forest Survey Unit is compared to that of previous years. For the Central States, 1970 pulpwood production and receipt data are presented by state, and four production classes are shown by county.

Presents a method of estimating lumber yields for hardwood trees. The grading system was developed using sugar maple but could apply to similar species.

Tables, prepared by computer, are presented for 10 selected compound-discount interest rate multipliers commonly used in financial analyses of forestry investments. Two set of tables are given for each of the 10 multipliers. The first set gives multipliers for each year from 1 to 40 years; the second set gives multipliers at 5-year intervals from 5 to 160 years. Multipliers are given for 24 selected interest rates from 0.5 to 30%. Each table is briefly explained and an example of its use is given. These tables had been issued previously in multilithed form.

Aerial observations and radio tracking showed that wolves had ranges of 43 to 1,000 square miles. Kill rate during usual winters was one deer per wolf per 18 days, but harsher winters allowed increased kill. Wolf-killed deer generally were older and had more abnormalities than hunter-killed deer.

Describes the growth and yield relationship of Minnesota black spruce to site index, age, and basal area density based on multiple regression analysis.

Ranking or assigning priorities to problems is an essential step in research problem selection. Up to now, no rigorous basis for ranking forest insects has been available. We evaluate and rank forest insects with a systematic numerical scheme that considers insect impact on the multiple-use values of timber, wildlife, recreation, and water. The result is a better perspective on insects as important elements of forest ecosystems.

Presents a flexible sampling scheme that researchers and land managers may use in surveying and classifying plant communities of forest lands. Includes methods, data sheets, and computer summarization printouts.

Summaries of total and merchantable stand data from 34 permanent sample plots were used to derive equations for predicting present and future stand volumes. Equations are presented for predicting total cubic-foot volume, ratio of merchantable volume to total volume, and future stand diameter, heights, and basal area. Yield tables are given for total stand volume and merchantable stand volumes to 3- and 5-inch top diameters.

This reports describes the number, type, and size of farm structures built in a 17-state area during the years 1963-1965, together with information relating to the use and marketing of wood materials in such structures.