Treesearch

Provides a means of assessing the impact of hardwood-pine conversions on water yield. Assembles many interception studies and applies them to evaluate net precipitation under red pine and aspen forests .

Describes a computerized model of a full-tree field chipping system from stump to mill using the GPSS simulation language. The program instructions reproduce the interactions, production, and costs for the various operations under given stand and operating conditions so a user can find the best way to operate his system.

Describes the derivation and use of biomass prediction equations for five shrub species from northeastern Minnesota. The various equations predict four weight variables based on four shrub dimensions used as independent variables.

Methods are presented for estimating red pine site index from the height growth of red pine, site index of several associated species (jack pine, white pine, white spruce, or quaking aspen), and from easily measured soil properties. The restrictions and limitations of each method and their relative precision are discussed.

Hardwoods were planted in a long-abandoned field. Growth was poor in a grassy area, better in areas formerly having natural trees or planted pine, and outstanding in an area formerly having planted black locust. Improved growth was associated with better soils structure and more foliar nitrogen.

Describes the changes in the structure and quality of two upland central hardwood areas and discusses an anticipated change in species composition.

Of six species interplanted in oak clearcuttings, sugar maple, red maple, and white ash were the most successful. Other species planted were northern red oak, yellow-poplar, and American basswood. Gives numbers of trees that should be planted for each species and initial size of planting stock.

Efficient chip transport operations are difficult to achieve due to frequent and often unpredictable changes in distance to market, chipping rate, time spent at the mill, and equipment costs. This paper describes a computer simulation model that allows a logger to design an efficient transport system in response to these changing factors.

This paper provides an insight into how snowmobilers feel about various management strategies to regulate snowmobile use on public land. The paper provides the composite opinion of snowmobilers and their opinion based on whether they were members of snowmobile clubs.

Values of the Palmer Drought Index, the Keetch-Byram Drought Index, and a Buildup Index are calculated for 26 critical fires situations in the north-central and north-eastern states. The paper examines the response characteristics of these indexes, representative of different moisture regimes, relative to fire danger.