Treesearch

Seasonal weight-volume relationships were determined for rough (bark on) aspen and black spruce 100-inch pulpwood that was delivered withing 1 week after cutting in northern Minnesota during 1971-72. For aspen, the weight of wood and bark per cubic foot of wood averaged 56 pounds in the winter and 61 pounds in the summer. This relationshipfor winter-cut black spruce was apporximately 53 pounds.

This 28th annual report shows 1973 pulpwood production by county and species group in Michigan, Minnesota, and Wisconsin. Lake States pulpwood production rose to 4.7 million cords in 1973 from 4.3 million cords in 1972.

Infrequent burning weather, low flammability of the aspen-hardwood association, and prolific sprouting and seeding of shrubs and hardwoods made repeated dormant season burning a poor tool to convert good site aspen to conifers. Repeat fall burns for wildlife habitat maintenance is workable if species composition changes are not important.

Root collar sprouting of nine hardwoods was measured annually after a prescribed burn. Basswood, red oak, and paper birch were the most vigorous sprouters; sugar maple and yellow birch the least; and American elm, bur oak, ironwood and red maple were intermediate. Parent tree diameter influenced spreading.

Volume tables are given for yield of clear-one-side, flat, dimension from tree and bolts cut in a natural stand of aspen 37 to 62 years old.

Presents the results of a preliminary study of secondary beneficiation of compression debarked chips to reduce residual bark to acceptable amounts. Ballmilling is a feasible method of reducing residual bark and minimizing wood loss.

Mortality of northern red oak seedlings in a spring prescribed burn was related to temperature near the root collar. Most of the 42 percent of seedlings that survived the burn developed new shoots from the root collar.

Field tests on the Hiawatha National Forest have shown that soil incorporation of sewage vault wastes doesn''t pose an environmental hazard when used in areas that are protected from public access.

Missouri''s commercial firest land totaled 12.4 million acres less than that reported in 1959. The largest losses occurred in the Prairie and Southwestern Ozark Units.

Presents a key based on seedling and needle characteristics for identifying seedlings of eight North American spruce species.