Treesearch

Presents information for black walnut seedlings on storage chilling requirement, fall lifting for overwinter storage, spring lifting, planting times, use of root regeneration potential (RRP) to assess physiological quality of planting stock, and relation between RRP at planting and field performance.

Describes the energy consumption and biological effects of fluorescent, incandescent, and high pressure sodium lighting on the growth of poplars, white spruce, and jack pine in a greenhouse. At similar light levels the biological effects of all three light sources were similar. The incandescent lamps consumed several times more energy than the other two light sources.

Discusses the advantages and disadvantages of various time study methods for determining efficiency and productivity in logging. The work sampling method is compared with the continuous time-study method. Gives the feasibility, capability, and limitation of the work sampling method.

Several methods of calculating machine rates, costs, and productivity for both single pieces of logging equipment and for logging systems are discussed.

Shoot growth and survival of container-grown and 1-0 bare-root English oak (Quercus robur L.) seedlings are reported for a 3-year period after planting in a clearcut. Effects of mulching with black polyethylene are also reported.

Fertilization of poor site black spruce on organic soil with various rates of nitrogen and phosphorus increased height and diameter growth from 2 to 4 times. The growth response declined with time but was still apparent 16 years after fertilization. Shrub biomass and coverage, and nutrient levels of spruce foliage were strongly affected by fertilization.

Analyzes previous visits to a forest and the associated experiences, as well as the expectations of those who had not previously visited a forest. Recommends educational programs that focus on the urban forest.

Presents findings from a study in Michigan's Upper Peninsula to evaluate the effectiveness of unstaffed trail registration stations to obtain recreation use information. Two registration approaches were evaluated: (1) self-issued voluntary registration form, and (2) self-issued mandatory registration form. The paper also cites factors influencing registration compliance and gives implications for management.

Reviews opportunities for treatment of timber stands in Minnesota for the decade of 1977-1986. Under the assumptions and management guides specified, 27% of Minnesota's commercial forest land would require timber harvest or some other form of treatment during the decade.

Papers presented at the Second Conference on Scientific Research in the National Parks.