Treesearch

Presents the results of a one-year study to evaluate the efficiency of the bark-chip separation-segregation system on whole-tree chips of quaking aspen, sugar maple, and jack pine. A residual bark content of 3% or less was achieved with all three species during all cutting seasons.

Describes growth and survival of seedlings, cut and uncut seedling sprouts, and stump sprouts for 10 years after clearcutting in white oak stands and describes how to evaluate quantitatively the reproductive potential of 40 to 60-year-old white oak stands before they are clearcut. Survival was high for all four reproduction types and stumps grew the best.

Reports 3-year diameter growth, height growth, and crown responses of 16-year-old dominant and codominant saplings to five degrees of crown release.

Two Populus clones grown for short rotations at three dense planting spacings produced some extremely high yields of material of acceptable quality. However, variation in yields and quality illustrates that selection of genetic material and the cultured regime under which a species is growth are significant factors that must be determined in maximum-yield systems.

Shows that lakes can be classified into perched, ground water, and transitional categories according to specific conductance values. Confirms the classification with 10 years of water table measurements in 29 wells and discusses several applications of lake specific conductance values.

Describes the means of surveying and estimating the populations of birds, mammals, amphibians, and reptiles in 1972 and 1973 on this 17,000-acre forest in the Upper Peninsula of Michigan. Gives an annotated list of birds and mammals and estimates biomass of amphibians in four habitats.

Describes the effects of pruning, season of pruning, shading, sunlight, and side of tree on epicormic branching and quality of first 16-foot log.

The first 3-year results of applying four intensities of crown release and one crown release plus a broadcast N, P, and K fertilizer treatment to individual 65-year-old birch trees are presented.

Describes patterns of forest fire activity across the northeastern and north central United States. Gives average dates of greening ad curing of herbaceous plants, medium size of fires in various fuels, and annual profiles of peak fire activity. It also examines combinations of major fire cause and day-of-week activity.

A reference of species of trees grown in the North Central States and their uses.