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Full-Text Articles in Life Sciences
Tb186: Assessing Silviculture Research Priorities For Maine Using Wood Supply Analysis, Robert G. Wagner, Ernest H. Bowling, Robert S. Seymour
Tb186: Assessing Silviculture Research Priorities For Maine Using Wood Supply Analysis, Robert G. Wagner, Ernest H. Bowling, Robert S. Seymour
Technical Bulletins
To identify the highest priorities for silviculture research in Maine, the authors of this report quantified the absolute and relative influence of future silvicultural investments (tree planting, herbicide application, and PCT) and commercial thinning on projected harvest levels and future wood supplies in Maine. They also quantified the absolute and relative importance of the growth and yield assumptions (via sensitivity analysis) used in estimating the influence of these silvicultural treatments on projected harvest levels and future wood supplies in Maine; and based on the absolute and relative importance of the growth and yield assumptions and on the influence of differing …
Tb141: Nitrogen Fertilization Effects On Growth And Value Of Eastern White Pine Sawlog Stands On Till And Outwash Soils, Robert K. Shepard, Gregory A. Reams
Tb141: Nitrogen Fertilization Effects On Growth And Value Of Eastern White Pine Sawlog Stands On Till And Outwash Soils, Robert K. Shepard, Gregory A. Reams
Technical Bulletins
Diameter growth response functions were developed using data collected from nitrogen fertilization study plots in eastern white pine stands on till and outwash soils. These functions were combined with height measurements and used to evaluate stand volume and value growth. White pine diameter growth functions were developed for application rates of 0, 50, 100, and 200 lb of nitrogen/ac, but only those for the 0 and 100 lb/ac treatments were compared because it was evident that the 100 lb/ac treatment would provide a larger financial return than either 50 or 200 lb/ac. The mean increase in sawtimber volume due to …
Tb125: Fertilization Of Eastern White Pine (Pinus Strobus L.) In Maine Shows Economic Potential, Robert K. Shepard, Thomas B. Brann
Tb125: Fertilization Of Eastern White Pine (Pinus Strobus L.) In Maine Shows Economic Potential, Robert K. Shepard, Thomas B. Brann
Technical Bulletins
Plots in seven eastern white pine sawlog stands were treated with nitrogen at rates of 0, 56, 112, and 224 kg/ha. After four years the largest increase in basal area growth, 0.31 dm2 /tree, and volume growth, 13.0 m3 /ha, occurred in plots that received 112 kg/ha. It appears that an application rate of 112 kg/ha may provide a real return of 15% or more in some stands.
Tb65: The Commercial Use Of Puckerbrush Pulp, Andrew J. Chase, Fay Hyland, Harold E. Young
Tb65: The Commercial Use Of Puckerbrush Pulp, Andrew J. Chase, Fay Hyland, Harold E. Young
Technical Bulletins
This study investigates the potential of several local puckerbrush or weed trees and shrubs as sources of fiber for papermaking. Four different pulping processes were used (sulfate, magnesium bisulfite, neutral sulfite semichemical, and cold caustic) with six puckerbrush species (alder, gray birch, red maple, pin cherry, aspen, and willow). Mixtures of puckerbrush species, and commercial chip-puckerbrush species mixtures were pulped by the sulfate process with the objective of producing a pulp that would be suitable for fine-grade papers. The results produced a good grade of bleachable pulp with adequate physical characteristics for most fine paper grades. The other three pulping …
Tb63: Variation In Foliar Nutrient Concentrations In Red Spruce, C. E. Schomaker
Tb63: Variation In Foliar Nutrient Concentrations In Red Spruce, C. E. Schomaker
Technical Bulletins
Red spruce (Picea rubens Sarg.) is an important pulpwood species in northern New England and Canada. Management objectives favor this species and the closely related black spruce (Picea mariana Mill. BSP) on many sites. Foliar nutrient concentrations of unfertilized, economically mature, red spruce trees growing on four different sites and over two- and three-year periods are presented here and compared to foliar concentrations reported by other scientists.
Tb25: The Effect Of Stand Factors On The Productivity Of Wheeled Skidders In Eastern Maine, Ernest B. Harvey Iii, Thomas J. Corcoran
Tb25: The Effect Of Stand Factors On The Productivity Of Wheeled Skidders In Eastern Maine, Ernest B. Harvey Iii, Thomas J. Corcoran
Technical Bulletins
The objective of this study was to determine what forest stand factors, as they constitute a set of operating conditions, affect skidder and skidder crew productivity and the degree of their effect.
Tb18: Mensuration Methods For Site Classification Of Shade Tolerant Tree Species, Leigh E. Hoar Jr., Harold E. Young
Tb18: Mensuration Methods For Site Classification Of Shade Tolerant Tree Species, Leigh E. Hoar Jr., Harold E. Young
Technical Bulletins
All of the climax tree species in Maine are shade tolerant. This means that they have the capacity of surviving and growing slowly in the seedling, sapling and pole-size stages. As a result none of the established methods employing total age are applicable. In searching for a way to overcome this problem an entirely new approach to quantitative site evaluation was conceived. This study evaluates this new mensurational approach to site evaluation for shade-tolerant trees.
Tb15: The Standardization Of Symbols In Forest Mensuration, International Union Of Forestry Research Organizations
Tb15: The Standardization Of Symbols In Forest Mensuration, International Union Of Forestry Research Organizations
Technical Bulletins
This technical bulletin reprints the recommendations on the standardization of symbols in forest mensuration, originally published in 1959. The recommendations were made by a small working group in Section 25 of the International Union of Forestry Research Organizations, which was appointed at the Congress of the Union held in Rome in 1953. Members of the group were asked to enquire into the possibility of standarizing the use of symbols (and the systems of measurement) in forest mensuration and to make recommendations.
Tb10: A Comparison Of Arch-Yarding And Ground-Skidding Of Pine Sawlogs In The University Of Maine Forest, Henry A. Plummer, Roger F. Taylor
Tb10: A Comparison Of Arch-Yarding And Ground-Skidding Of Pine Sawlogs In The University Of Maine Forest, Henry A. Plummer, Roger F. Taylor
Technical Bulletins
The decision whether to use a trailing-arch or operate by ground-skidding methods may face many sawlog producers. This case study attempted to determine statistically whether there existed significant differences between the two methods of operation by examining the various activities performed by a crawler-type tractor within the arch-yarding and ground-skidding phases of a harvesting system.
Tb7: Scheduling Of Pallet Trucks In Pulpwood Operations, Thomas J. Corcoran
Tb7: Scheduling Of Pallet Trucks In Pulpwood Operations, Thomas J. Corcoran
Technical Bulletins
This study illustrates a method of scheduling pallet trucks using data obtained from pallet operations in Maine. The method, which is based upon a linear programming technique, can be employed in the determination of the minimum number of trucks required to handle a continuous flow of pulpwood in situations involving multi-pickup and multi-delivery points. In addition, the program establishes times and places of pulpwood pickup and delivery for each required truck.