United States Department of Agriculture
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.
Within the crowns of red pine, Pinus resinosa Ait., trees, larvae of the cone insect, Dioryctria disclusa Heinrich, tended to follow the distributions of their foods. Between-tree distributions of larvae, however, were relatable to food distributions in only two of five years. Cone damage/tree by D. disclusa increased linearly with cone abundance per tree when insect...
Presents and summarizes the green weights and volumes of trees, boles and residue for sugar maple, white spruce, aspen, balsam fir and red pine in Northern Michigan. Equations, tables and graphs are included for each of the five species.
Changes in litter weight, soil bulk density, soil nitrogen and organic carbon contents, soil water depletion, and snowpack accumulation were evaluated over 14 years of plantation growth on three different sites. The species studied were white and red pines, white spruce, and European larch, along with unplanted controls.
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 .
In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to lOO,547/ha) for a single species in a...