Treesearch

Functions and parameters are given for computing site index for 21 Lake States tree species. Functions and parameters are also given for computing total height of dominant and codominant trees.

The sulfur concentration in 138 plant taxa is reported. Significant differences in concentration are noted between some plant life forms and between different environments.

Time study of planting a 3 ha short-rotation intensively cultured plantation on a 1- by 1-m spacing found a productivity of 0.52 ha/hour and planting cost of $97.87/ha

In 1980 North Dakota's forest resources covered 518,100 acres of land, a slight decline from 572,400 acres reported in 1954. The area of commercial forest land also dropped from 398,400 acres to 343,200 acres. The aspen forest type makes up 41 percent of the commercial forest area.

Michigan's saw log production climbed to 563 million board feet in 1978 from 514 million board feet in 1977. Eight percent was shipped to out-of-state mills. Michigan's 341 active sawmills received 525 million board feet of logs; only 1 percent came from other States.

Describes a technique for using petroleum jelly-coated microscope slides to determine the spore dispersal patterns of fungi that cause diseases of nursery, plantation and forest trees

Samples from the forest floor litter layer were collected seasonally from under medium to fully stocked larger sapling to sawtimber stands in Lower Michigan to study seasonal ash content changes. The total ash and silica-free ash content of tree foliage in the upper part of the litter layer differed little from season to season. Differences in ash content due to species were generally more important than those due to season. The total ash content than those due to season. The total ash content of an entire northern hardwood-oak-hickory forest litter layer increased significantly (0.01...

Discusses problems associated with fire-cause data on USDA Forest Service wildfire reports, traces the historical development of wildfire-cause categories, and presents the pros and cons of retaining current wildfire-cause reporting systems or adopting new systems.

Describes calculator programs that simulate the growth and thinning of a stand. Also includes a method of computing maximum yield, allowing a comparison of potential and actual yields of a stand.

Eastern South Dakota's 113,600 acres of commercial forest land supported 51.9 million cubic feet of growing stock in 1981. This is a decrease in timber volume of 24 percent since the last inventory in 1965. the decrease was entirely in hardwood species. Cottonwood is the most abundant tree species -- it accounts for 33 percent of the growing-stock volume and comprises 44 percent of the sawtimber volume. Shannon County in the southwestern part of the State contains the largest amount of timber volume.