Treesearch

This conference was the first full meeting of the Working Party since its inception at the Beech Bark Disease Colloquium held in Nancy, France in 1979. The meeting from 27 September to 7 October 1982 took the form of a study tour convened at the College of Forestry, University of Maine,with field trips in the Central New England States and New York and concluding at the U.S.D.A. Northeastern Forest Experiment Station's Center for Biological Control of Northeastern Forest Insects and Diseases, in Hsmden, Connecticut. During the tour a series of conference paper sessions was held and field...

Laboratory experiments were conducted to determine juglone sensitivity of 16 species (Trifolium incarnatum, Coronilla varia, Vicia villosa, Lespedeza stipulacea, L. cuneata, Acer ginnala, Caragana arboreseens, Elaegnus angustifolia, E. umbellata, Lonieera maackii, Quercus alba, Fraxinus americana, Liriodendron tulipifera, Alnus glutinosa, Pinus strobus, and P. sylvestris) being considered for mixed plantings with Juglans nigra (black walnut). All species were sensitive to juglone, but seed germination and radicle elongation were less affected than shoot elongation and dry weight accumulation.

Wood craftsmen would like an alternative to hardwood lumber and plywood and softwood products. They are very interested in edge-glued, standard-size panels. These conclusions are based on interviews with craftsmen at two trade shows, and the results are included in this report along with our recommendations for optimum acceptance by craftsmen of this new product.

Provides tables for estimating residual percent crown cover, using a 10-factor prism, of three species groups: (1) sugar and red maples, yellow and paper birches; (2) white ash, white pine, red spruce, balsam fir, and hemlock; and (3) beech.

To better evaluate the effects of surface mining for coal in first-order watersheds in Appalachia, a network of 421 water-quality sampling stations was established in 136 counties in nine states in 1977 and sampled on approximately a monthly basis until August 1979. Three categories of watersheds were sampled: (1) unmined, (2) mined after January 1972, and (3) mined before January 1972. Mean pH values averaged 7.0, 6.7, and 6.3 for these three categories of watersheds, respectively.

Producing healthy hardwood cuttings for Populus plantation establishment requires attention to the management of clonal nurseries, timely collection of cuttings, adequate grading of cuttings, storage temperature and conditions, preplanting treatments, and planting operations. Recommended nursery practices are outlined, along with their grounding in such biological factors as stem anatomy, moisture content, induction of dormancy, availability of carbohydrate reserves, and freedom from insects and pests.

Several technologies are described that have been developed to convert wood to fuel, chemicals or food products. Biomass from intensively cultured plantations has potential as a source of material for these energy related technologies. The technologies discussed here include: pyrolysis, gasification, liquefaction, hydrolysis, chemicals from lignin and hemicelluloses, and conversion of wood and foliage to ruminant animal feedstocks. Although these technologies show great promise, most need to become more economically attractive before they can be used on a large scale.

A study was begun in 1980 in a 4-year-old planting of P. nigra var. betulifolia x P. trichocarpa to identify the effects of harvesting season on-coppice production. Parts of the plantation were harvested monthly from October 1980 to September 1981. The trees were cut leaving 10 and 30 cm (4 and 12 in) stumps. Coppice measurements were taken 1 year after harvest. Harvesting during the leafless season (October to mid May) positively affected (a) stump survival, (b) height and d.b.h, growth of dominant sprouts, and (c) number of live sprouts/stump taller than 1.37m. Harvesting during the...

A promising approach to increasing the supply of wood fiber for pulp and energy is short-rotation intensively cultured (SRIC) forestry. To apply the principles of agriculture to the growing of wood fiber, designers of harvesting equipment must consider a unique set of operating criteria. This paper summarizes the design criteria relevant to the SRIC concept and describes the results of initial trials with a prototype short-rotation harvester.

Provenance tests and one clonal test have been analyzed to provide guidelines for the continuing efforts on the genetic improvement of Alnus. Observations also are made on the need for experiments with other silvicultural alternatives that might be applied to the intensive culture of alders.