Treesearch

Summer moisture contents and factors for converting fresh plant weights to ovendry weights were determined for selected herbs, ferns, and small shrubs commonly found on upland sites in northern Lower Michigan. Sampling was done weekly from mid-June through early September 1978, following the period of major plant growth. Average summer moisture contents range from 120 percent for blueberry (Vaccinium spp.) to 370 percent for wild lily-of-the-valley (Maianthemum canadense). Generally, moisture content averages and trends were similar for plant groups sampled in both northern Lower Michigan...

Reports development and use of a radio transmitter device that can be dropped from aircraft into target areas in remote habitats. Such a device could be a valuable tool for studying and managing forests and wildlife, for controlling forest fires, and for handling emergencies.

Live tree biomass estimates are presented for five counties of northeastern Minnesota. Tree biomass is given in green tons for forest types and species groups.

The fourth Minnesota Forest Inventory shows that aspen continues to dominate the State's forests. Thirty-nine percent of Minnesota's commercial forest area is in the aspen forest type. Aspen species accounted for the largest portion of growing-stock inventory, net annual growth, and removals.

Insolation measured with a precision spectral pyranometer, was recorded near Carterville, Illinois, for 1 year. the pyranometer was tilted at an angle of 25 degrees in summer, 50 degrees in winter, and 37.5 degrees in spring and fall. the insolation measured in winter was found to be significantly larger than the insolation estimated on a horizontal surface.

An equation to predict total-tree height from merchantable length was developed for hardwoods: Y= 30.0 + 0.85 X, with R2 = 0.87.

Measurements of lake and impoundment pH for several years, intensive sampling within years, and pH-calcium plots verify normal pH levels and do not show evidence of changes due to acid precipitation. These data in comparison with general lake data narrow the northern Lake States area in which rain or snow may cause lake acidification.

Pulpwood production in the Lake States -- Michigan, Minnesota, and Wisconsin -- advanced to 5.66 million cords in 1980. Pulpwood production is shown by county and species group for these three states

A systematic procedure for predicting the payload capability of running, live, and standing skylines is presented. Three hand-held calculator programs are used to predict payload capability that includes the effect of partial suspension. The programs allow for predictions for downhill yarding and for yarding away from the yarder. The equations and basic principles involved in analyzing skyline systems for allowable payload are presented.