Treesearch

Prediction equations for estimating leaf blade area and dry weight from measurements of petiole thickness were used to estimate defoliation of Populus tremuloides, Acer rubrum, Quercus rubra, and Q. alba. On one tree of each species, a sample of leaves was artifically browsed in May and harvested in July. The fractions of leaf blade tissue remaining in the samples after treatment in May were compared to the fractions remaining after harvest in July, which were calculated using the blade-petiole relations. Significant differences were found between the fractions for all species except P....

Thirteen years of hydrologic data from two contiguous small watersheds in West Virginia were analyzed to determine the effects on streamflow of natural reforestation on abandoned farmlands. During the study period (1958-1970), streamflow on the watersheds was unchanged. The history of land use on the study area helps explain the apparent lack of hydrologic effects of reforestation. Aerial photographs taken in 1933, 1945, 1956, and 1968 documented the rapid advance of reforestation. Observations of streamflow began about 25 years after farming had terminated; any measurable hydrologic...

Shows 1976 veneer-log production and receipts by species in the Lake States (Michigan, Minnesota, and Wisconsin) and in the Central States (Illinois, Indiana, Iowa, and Missouri). Comparisons are made with similar data for 1974. Includes tables showing veneer-log production and receipts (for selected years) since 1946 in the Lake States and since 1956 in the Central States.

The area of tax-forfeited land that is county-administered in Minnesota is currently estimated at almost 2.9 million acres--a decrease of about 17% since the mid-1960's. This decrease is the result of a change in land sales, land forfeitures, and other land transfers. Not only have land sales decreased since the early 1960's, but also less land has been forfeited back to the counties. Although the tax-forfeited acreage sold increased each year, the value of the land sold increased dramatically--from $6.33 per acre in 1960 to nearly $70.00 per acre in 1974.

Discusses 1976 pulpwood production and receipts and recent production in the Lake States and Central States. Shows pulpwood production in the Lake States (Michigan, Minnesota, and Wisconsin) by species for each county and compares production by Forest Survey Unit with that of previous years. Presents 1976 pulpwood production and receipts data by state for the Central State (Illinois, Indiana, Iowa, and Missouri) and shows four production classes by county.

Missouri's third Forest Survey showed an 11% decline in commercial forest area between 1959 and 1972. Most of this land was converted to nonforest uses, primarily pasture. Of the land that remained classified as commercial forest, 75% underwent little or no treatment between surveys.

Describes a canker, shoot blight, and leaf spot disease of yellow birch seedlings in the northern Great Lakes region and tells how and when trees become infected by the fungal causal agent, Gnomonia setacea.

Effects of position in the crown on needle morphology and surface area were studied. Needle length, surface area, and dry weight increased and specific needs area decreased from the lower to the upper third of the crown.

Describes response to weathering of 100-gram (1/2-inch) fuel moisture sticks over 6-month fire season in the Northeast. Presents a chart for correcting weathered-stick values and gives replacement recommendations for those sticks used in the National Fire Danger Rating System.

An application section presents tables for estimating foliage and branchwood (wood plus bark) of aspen tree crowns; the branchwood is subdivided by (1) living and dead material and by (2) living material alone into diameter size groups. A documentation section describes the derivation of equations and compares the equations derived with those derived by other researchers.