Treesearch

Two-year-old seedlings of black cherry, Prunus serotina Ehrh., northern red oak, Quercus rubra L. and sugar maple, Acer saccharum Marsh., and ramets of hybrid poplar, Populus maximowizii x trichocarpa, clone 245 were grown in eight charcoal-filtered open-top chambers per species. Half the chambers, per species, received 0.08 iL L-1 O3 from 1000 to 1800 h each day of the growing season. Accelerated foliar senescence and associated O3- induced loss in Rubisco were observed in older foliage of hybrid poplar and black cherry. Younger leaves were less responsive to O3 and in the case of hybrid...

The response of tree root systems to interacting environmental stress is poorly understood in comparison to knowledge of above-ground organs.

The conference addressed the broad issues concerning environmental policies affecting the forestry and forest products industries, the driving forces behind them, and the effects they have on the national and global environment. A paradigm of three general factors or forces that drive environmental policy was proposed based on: 1) Society's Wants and Needs, 2) The Need to Maintain the Integrity of the Eastern Forest Ecosystems, and 3) The Role of Forest Management, Forest Products Research and Development and the Associated Improved Utilization of the Harvested Resource in satisfying...

The proceedings contains 50 research and management papers on the following subjects: trends in the recreation profession, mountain biking, recreation pricing, outdoor recreation management, environmental perceptions and recreation resource management, outdoor recreation: satisfactions and conflicts, tourism, economic impacts and values, historic and cultural tourism, recreational trails, recreation choice and participation trends, and travel motivations and decision-making.

A survey of the flora and natural communities of Nancy Brook Research Natural Area, Crawford Notch, White Mountain National Forest, New Hampshire, was conducted during the summer and fall of 1992. Nancy Brook Research Natural Area is noted for being the largest virgin mountain spruce forest in New Hampshire, and one of the few remaining large examples in the northeastern United States. The primary goal was to characterize major natural community associations observed across representative samples within the area, and document the flora contained therein.

OPTIGRAMI V2 is a computer program available for IBM persaonl computer with 80286 and higher processors. OPTIGRAMI V2 determines the least-cost lumber grade mix required to produce a given cutting order for clear parts from rough lumber of known grades in a crosscut-first rough mill operation. It is a user-friendly integrated application that includes optimization for species graded under standard National Hardwood Lumber Association grade rules, as well as yellow-poplar and black walnut. Output information includes gross volume of lumber required in each lumber grade, estimated total...