Treesearch

To properly classify or grade logs or trees, one must be able to correctly identify defect indicators and assess the effect of the underlying defect on possible end products. This guide aids the individual in identifying the surface defect indicator and also shows the progressive stages of the defect throughout its development. It illustrates and describes eight types of external defect indicators and associated defects that are particularly difficult to evaluate.

Forest growth models that use predicted tree diameters or diameter distributions require a reliable height-prediction model to obtain volume estimates because future height-diameter relationships will not necessarily be the same as the present height-diameter relationship. A total tree height prediction equation for even-aged upland oak stands is presented. Predicted tree heights follow a biologically consistent progression with increasing dbh, age, and site index. The consistent progression of heights does not allow erratic or illogical volume increments. The proposed equation satisfactori...

The Appalachian Thinner, a prototype cable yarder, has proven capable of harvesting timber on steep slopes. Details of the fabrication of the prototype yarder are presented. An Appalachian Thinner can be built economically in a typical logger's repair shop.

To make the most efficient use of scarce recreation resources, urban forest managers need to know what features of recreation sites are the most important for creating high-quality recreation environments. In this study, observers viewed photographs of urban forest sites in the Chicago area and described the features of the sites that they liked and disliked. Natural features such as trees, grass , and water were most frequently mentioned as features they liked and man-made objects, problems with vegetation, and poor maintenance were most frequently mentioned as features they disliked....

Presents the biology and ecology of the pine root collar weevil, and provides survey techniques and management strategies for its identification and control.

Discusses 1980 production and receipts and recent production for other years in the Lake and Central States. Shows Michigan, Minnesota, and Wisconsin production by species for each county and compares production by Forest Inventory Unit with that of previous years. Presents 1980 production and receipt data for Illinois, Indiana, Iowa, and Missouri, and shows four production classes by county.

The fourth inventory of the timber resource of Michigan's Eastern Upper Peninsula Survey Unit shows a 9% decline in commercial forest area and a 19% gain in growing-stock volume between 1966 and 1980. Presented are highlights and statistics on area, volume, growth, mortality, removals, utilization, and biomass.

The fourth inventory of Minnesota's forest resources shows a 21% increase in growing-stock volume between 1962 and 1977, from 9.4 to 11.5 billion cubic feet. Presented are text and statistics on timber volume, growth, mortality, removals, and future timber supply.

The second inventory of North Dakota forest resources shows a decline in commercial forest area between 1954 and 1980. Presented are text and statistics on forest area and timber volume, growth, mortality, ownership, stocking, future timber supply, timber use, forest management opportunities, and nontimber forest resources. A forest type map is included.

Plot data from 1977 Minnesota forest inventory were used to evaluate the productivity of Minnesota's aspen forest. Computer simulation was used to develop equations for evaluating the current and potential productivity of aspen forest stands. The analysis showed that 49% of the state's aspen forest type was producing less than half of potential volume yields.