Treesearch

Equations are presented for estimating weights of total crowns and crown components for Douglas-fir and western hemlock.

Heat units were accumulated during the spring and early summer for five seasons to relate degree-days to tussock moth and host tree phenology. Little variation in the pattern and date of the phenological events was found during the five seasons of monitoring near Fort Klamath, southern Oregon.

The occurrence of permafrost in stream valleys of central Alaska causes problems with conventional stream-gauging installations. To minimize both thermal and physical disturbance at measurement sites, pre-fabricated Parshall flumes have been used to monitor streamflow at sites underlain with permafrost in a subarctic research watershed. Flumes ranging in capacity from 263 to 700 liters per second (l/s) were installed and have performed satisfactorily for two open-water runoff seasons.

Infiltration capacities were 50 percent greater during fall than during summer for forest soils of western Oregon. These results contrast with those measured in other studies. In forested areas, investigators should be aware of potentially large seasonal changes in infiltration capacities. Such seasonal changes may exceed effects due to applied treatments (logging, slash disposal, burning, etc.) and can confound study results.

Equations for estimating the selling value and tally volume for ponderosa pine lumber from the standing trees are described. Only five characteristics are required for the equations. Development and application of the system are described.

Price formation in export markets and available data on export and domestic markets are discussed. The results of tests of several hypotheses about interactions between domestic and export markets are presented and interpreted from the standpoints of trade promotion and trade policy.

Plant communities in the Great Basin of southeastern Oregon are described, and a field key is provided. The value of a plant community’s vertical and horizontal structure and the seasonal availability of its forage are examined in relation to wildlife habitat in managed rangelands. Further, the importance of individual and combined plant communities to wildlife in managed rangelands is discussed, and management alternatives are presented.

The occurrence of laminated root rot caused by Phellinus weirii on non-federal timberlands in 1976 in northwest Oregon is discussed and its locations are shown.

This report summarizes a 1978 timber-resource inventory of six counties in southwest Washington: Clark, Cowlitz, Lewis, Pacific, Skamania, and Wahkiakum. Detailed tables of forest area, timber volume, growth, mortality, and harvest are presented.

Air temperature at 0.5 m and soil temperature at 0.01 m were measured during May and early June after forest harvest on four residue treatment sites and a control. Broadcast burning or burning in piles increased daily accumulation of heat in air while scattered chips and scarified and cleared treatments were equal to the control (broadcast, untreated slash). During mid-afternoon, the pile-and-burn treatment was warmest; near sunrise, the broadcast burn was consistently warmer. Soil temperature within the chipped plot was colder than in the other plots. For seeded and unseeded plots, the...