Treesearch

Presents the resource manage with a key for choosing silvicultural practices for the elm-ash-cottonwood type in the North Central States. Timber production is emphasized.

Research results and ongoing research activities in oak planting and related physiology and genetics studies are described in 21 abstracts.

The modifier function used in STEMS (Stand and Tree Evaluation and Modeling System) mathematically represents the effect that the surrounding forest community has on the growth of an individual tree. This paper 1) develops the most recent modifier function, 2) discusses its form, 3) reports the results of the analysis with biological considerations and 4) evaluates the performance of this new model.

Presents the green weights of the above-stump portions of trees, boles, and residue for eight tree species in northern Michigan. Estimating equations and weight tables are presented for the tree components of each species.

Describes the tables derived from the 1980 Forest Survey of Michigan and presents ways the tables can be used. These tables are broken down according to Michigan's four Forest Survey Units, 14 forest types, and 5 site-index classes.

An experiment using auger cutters to remove single limbs from six species showed that torque required depends on species and relative cutter rotation direction and that all species require 2 horsepower or less per inch width of cut using 2 1/2-inch-diameter cutters

Chunkwood was found to be composed of a few large particles and many small particles with the large particles constituting almost half the total weight. More than 75 percent of the chunk weight was composed of particles weighing more than 100 grams (ovendry), while 85 percent of the chip weight was composed of particles weighing 3 grams or less. Energy densities ranged from 89,675 Btu/cu. ft for green aspen chips to 162,520 Btu/cu. ft for dried sugar maple chunks. Chunks and chips were air-dried from July through October in eight covered cribs. For both species tested, the chunks dried...

A model is described for estimating total and merchantable tree heights for Lake States tree species. It is intended to be used for compiling forest survey data and in conjunction with growth models for developing projections of tree product yield. Model coefficients are given for 25 species along with fit statistics. Supporting data sets are also described.

Species coefficients are reported for predicting individual tree survival for nine Lake States species, supplementing a previous report for 10 species. Tree attributes are diameter growth rate and diameter at breast height. Regional and local performances are summarized.

In 1981 wooded strips and windbreaks in Kansas coverd 336,000 acres and were more than 54,000 miles long. Wooded strips contained 300 million board feet of sawtimber and 92 million cubic feet of growing stock.