Treesearch

Water and nutrient flow were measured on a complex upland-peatland watershed in north central Minnesota. Annual water budgets for upland and peatland components and for the total watershed were developed. Nutrient input and output budgets were developed for each component on a seasonal basis, using net precipitation inputs, and an annual nutrient budget was developed for the entire watershed, using gross precipitation and total outputs. Both components evapotranspire water near potential rates. The upland converts 34% of the water input to water yield, while the peatland (a bog in a lower...

A water yield model (TIMWAT) has been developed to predict changes in water yield following changes in forest cover in northern Minnesota. Two versions of the model exist; one predicts changes in water yield as a function of gross precipitation and time after clearcutting. The second version predicts changes in water yield due to changes in above-ground biomass production and can therefore, be linked with timber growth simulation models. Forest cover changes which can be examined include clearcutting aspen and red pine, conversion from aspen to red pine, and conversion from aspen or red...

A statistical analytical report on a mail canvass of private commercial forest-land owners in Ohio. The study was conducted in conjunction with the third forest survey of Ohio by the USDA Forest Service. It discusses landowner characteristics, attitudes, and intentions of owners regarding reasons for owning, recreational use, timber management, and harvesting.

A comprehensive analysis of the current status and trends of the forest resources of Pennsylvania. Topics include forest area, timber volume, biomass, timber products, timber's role in the state's economy, growth, and removals. Forest area, volume, growth and removals are projected through 2008. A detailed treatment is glven to water, soil, minerals, fish, wildlife, and recreation as they relate to forest resources. Also identified are forest management opportunities for increasing the production of major forest resources and enhancing the benefits derived from Pennsylvania's forests.

An analytical report on trends of major land uses in Ohio from 1952 to 1979. The relationship between the decline in farm area and increase in forest land is emphasized. The losses of wood fiber attributable to clearing forest land between 1968 and 1979 are also estimated.

A canvass of the pulpmills in the 14 Northeastern states reveals that from 1979 to 1980, total pulpwood production rose to nearly 8-1/2 million cords and roundwood production to over 6 million cords; chipped residue production fell below 2-1/2 million cords. Mill receipts were 9.1 million cords--6.4 million in roundwood and 2.7 million in chips.

Reports the results of a survey of the timber industries of New York; contains statistics on industrial timber production and receipts, and production and disposition of the manufacturing residues. Comparisons are made with the most recent survey, and trends in industrial wood output are noted. Includes 18 statistical tables.

Female Black Ducks (Anas rubripes) collected in Maine during the summer, fall, and winter of 1974-1976 showed significant seasonal variation in body weight, nonfat dry weight, gizzard and pectoral muscle weight, and fat, moisture, and protein content. Variation of body weight within and among seasons was correlated more strongly with carcass protein content, and with fat content during seasons of heavy lipid deposition, than with three structural size variables (culmen, tarsus, and sternum). Regression equations including fat and protein as independent variables accounted for 80-90% of the...

Regression equations are used in both forestry and ecosystem studies to estimate tree biomass from field measurements of dbh (diameter at breast height) or a combination of dbh and height. Literature on biomass is reviewed, and 178 sets of publish equation for 25 species common to the Northeastern Unites States are listed. On the basis of these equations, estimates of aboveground oven-dry weight of trees from 2.5 to 50.0 cm db for each species are presented and discussed. When the general estimates of standing crop are required for commercial purposed or for assessment of nutrient removal...