Treesearch

Estimates of energy utilization from various sources indicate that even-aged northern hardwood stands utilize less than 1/2 percent of net solar radiation for wood, leaf, and seed production, and only about 1/10 percent for production of merchantable wood. Forest managers should seek to understand and manipulate the remaining 99+ percent of solar energy, for improving the efficiency of merchantable wood production.

Paired sugar maple trees with single tapholes were used to compare sap yields from vacuum-pumping with sap yields from gravity flow. Results indicated that vacuum yields were approximately twice as great as gravity flows. These results support previous findings from studies in which vacuum and gravity were compared with two tapholes on the same tree.

A study of the physical suitability of Appalachian hardwood sawlogs for manufacture of sawed timbers revealed that: most grade 1 logs can be used to saw timbers as large as 8 by 9 inches, end dimension; most grade 2 logs are suited for manufacture of timbers 6 by 8 inches and smaller; and most grade 3 logs are suited for manufacture of timbers 5 by 7 inches and smaller.

A study was made of the performance of selected species of legumes, grasses, and trees hydroseeded on anthracite coal-mine spoils in a slurry of lime, fertilizer, and mulch. Hydroseeding failed on coal-breaker refuse, but was partially successful on strip-mine spoils.

Plastic-foam cups with plastic lids were found to be more suitable for rearing larvae of the fall webworm, Hyphantria cunea Drury, than other types of containers tested. These cups are inexpensive, lightweight, rigid, and translucent; and they protect the contents from rapid fluctuations in temperature.

Early in 1969 a survey of the veneer industry in the Northeast was made to determine veneer-log receipts for calendar year 1968, by species and states of origin. The survey revealed the following changes in the past 5 years: A drop in the number of container veneer plants, offset by an increase in the number of other types of veneer plants. A 15-percent increase in veneer log production. A 22-percent increase in receipt of veneer logs and bolts at the plants. Exports of veneer logs from the Northeast continued to overbalance imports.

This annual report is based on a canvass of all pulpmills in the Northeast that use wood-either from roundwood or plant residues-as a basic raw material for a variety of products. Mills that use pulpwood as a raw material in producing insulation board and hardboard were also included in the canvass. The production-from-roundwood statistics reported in this bulletin are based upon mill receipts, which are subject to fluctuations caused by uneven wood-inventory buildups or liquidations from year to year. The plant residues are received at the mill mostly in chip form; however, some coarse...

Under the authority of the McSweeney-McNary Forest Research Act of May 22, 1928, and subsequent amendments, the Forest Service, U. S. Department of Agriculture, conducts a series of continuing forest surveys of all states to provide up-to-date information about the forest resources of the Nation. A resurvey of the timber resources of Ohio was made in 1966 and 1967 by the Northeastern Forest Experiment Station, approximately 16 years after the initial forest survey. In this resurvey, the State of Ohio provided an appropriation of $75,000 to intensify the forest survey in the heavily...

Under the authority of the McSweeney-McNary Forest Research Act of May 22, 1928, and subsequent amendments, the Forest Service, U.S. Department of Agriculture, conducts a series of continuing forest surveys of all states to provide up-to-date information about the forest resources of the Nation. The first forest survey of New York was made in 1948-50 by the Northeastern Forest Experiment Station, with cooperation from the New York Department of Conservation. A resurvey of timber resources of New York was made in 1966-68, again with the cooperation of the Department of Conservation. The...

The School of Forestry's Tree Improvement Research Project was initiated in 1955. Studies in this area during the past fourteen years have been designed to accumulate information on genetic diversity in native and exotic tree species and isolate genetically superior lines for direct use in Minnesota forest plantings or for further selective breeding. Nursery facilities and outplanting cooperation have been provided chiefly by the University's North Central Experiment Station and the Blandin Paper Company at Grand Rapids, the Cloquet Forest Research Center at Cloquet, and the USDA Forest...