Treesearch

The occurrence of red spruce, hemlock, beech, and sugar maple stands was related to habitat classified by substratum (generally C horizon or parent material), drainage, aspect, and elevation. Softwoods were found on rocky, outwashed, compacted, and poorly drained substrata; hardwoods were common on open glacial tills. Species was related to climate and apparent resistance of the substratum to weathering.

A FORTRAN IV computer program calculates, from a few field measurements, the volume of tree crowns. This volume is in layers of a specified thickness of trees or large shrubs. Each tree is assigned one of 15 solid forms, formed by using one of five side shapes (a circle, an ellipse, a neiloid, a triangle, or a parabolalike shape), and one of three bottom shapes (a circle, an ellipse, or a triangle). A test of the accuracy of this technique shows that it produces estimates within acceptable limits of error if the shape is carefully selected. The program sorts these volume data by layer...

Shows 1974 veneer-log production and receipts by species in the Lake States (Michigan, Minnesota, and Wisconsin) and in the Central States (Illinois, Indiana, Iowa, and Missouri). Comparisons are made with similar data for 1972. Includes tables showing veneer-log production and receipts (for selected years) since 1946 in the Lake States and since 1956 in the Central States.

Discusses 1974 pulpwood production and receipts and recent production trends in the Lake States and Central States. Gives pulpwood production in the Lake States by species for each county, and compares production by Forest Survey Unit with that of previous years. For the Central States, presents 1974 pulpwood production and receipt data by state, and shows four production classes by county.

Discusses recent Wisconsin forest industry trends; timber removals for industrial roundwood in 1973; production and receipts in 1973 of pulpwood, saw logs, veneer logs, and other industrial roundwood products. Shows trends in pulpwood and veneer log production and compares saw log production in 1967 and 1973. Discusses primary wood-using plant residue and its disposition.

In a nearly optimal cultural environment, Populus 'Tristis #1' grown for 3 years, planted at 9 by 9 inch spacing produced the equivalent of over 4 tons/acre/year of ovendry wood with specific gravity comparable to native aspen wood. Trees planted at wider spacings yielded less.

Seed crops of 19 species occurred at irregular intervals over a 26-year period but crop sizes of fall-maturing species were related to those of spring-maturing species.

Changes in litter weight, soil bulk density, soil nitrogen and organic carbon contents, soil water depletion, and snowpack accumulation were evaluated over 14 years of plantation growth on three different sites. The species studied were white and red pines, white spruce, and European larch, along with unplanted controls.

Provides current information on the wood-purchasing practices, problems, and future plans of the Illinois pulpwood-using industry.

Provides a means of assessing the impact of hardwood-pine conversions on water yield. Assembles many interception studies and applies them to evaluate net precipitation under red pine and aspen forests .