Treesearch

A procedure for rapidly obtaining significant quantities of chyle is described. The amount and composition of chyle collected from larvae of the gypsy moth, Lymantria dispar (L.), varied according to the instar examined and the age within the instar.

A 2-acre hybrid poplar planting on a reclaimed strip-mine was harvested at age 16. The commercial clearcut yielded 90 tons of pulpwood and 9,400 board feet of lumber. This is equal to a growth rate of approximately 2 cords per acre per year. Selected physical properties of the hybrid poplars were compared with those of other commercial eastern species.

Test plantings were established to evaluate the survival and growth of trees and shrubs on 10 acid strip mines in the bituminous region of Pennsylvania. Included in the test were five species of European alder, four birch species, black locust, sycamore, Scotch pine, autumn olive, sawtooth oak, bristly locust, and Japanese fleeceflower. After 11 years, data showed that two of the birches had highest rate of survival and best growth overall. On a few plots, European alder from a German seed source performed well. Scotch pine also performed well on a few plots. In general, survival and...

A study using observational and survey techniques found that no backcountry users fully complied with rules designed to promote campsite dispersion and to avoid recurrent use of particular sites. Users perceived hiking/camping in general, and movement away from established trails in particular, as involving an element of risk. They indicated that convenience was an important determinant of their site selections. Increased information about the rules did not decrease the use of previously used sites, but did increase the average distance of chosen campsites from established trails.

On a coal haul spur road where water sprinkling was the primary method of dust control, the duration of control was increased tenfold by covering the road surface with a layer of wood chips. The chip blanket prevented existing dust-size particles from being kicked up and swept into plumes by passing traffic, insulated the road surface against evaporation and protected it from the pounding and abrasion of truck tires.

This annual assessment of regional timber output is based on a canvass of the pulpmills in the Northeast that use roundwood or wood residue as a basic raw material for paper, insulation, and hardboard products. The report includes a discussion and tabular data on roundwood and chips from plant residues produced in and received by 14 northeastern states in 1977: pulpwood production by state, county, and species group; pulpwood receipts from roundwood by state and species group; pulpwood chip receipts by state and species group; and production of total-tree chips. From 1976 to 1977, pulpwood...

International 1/4-inch board-foot volume equations are presented for the 17 species groups used in the forest survey of the 14 northeastern states. The volume equations are nonlinear in form.

This publication is the final one in a series on tree decay developed in cooperation with Harold G. Marx, Research Application Staff Assistant, U.S. Department of Agriculture, Forest Service, Washington, D.C. The purpose of this publication is to clarify further the tree decay concept that expands the classical concept to include the orderly response of the tree to wounding and infection-compartmentalization-and the orderly infection of wounds by many microorganisms-successions. The heartrot concept must be abandoned because it deals only with decay-causing fungi and types of decayed wood....

Understanding the Game of The Environment is a summary of major ecological principles and concepts viewed as a game in which living organisms interact with each other and their nonliving environment. The use of game terminology helps place a bewildering array of facts and relationships into an understandable framework. All students are familiar with games, and they recognize the necessity of defining the Playing Field, identifying the Players, and understanding the Rules of the Game. Similarly, students understand that when Rules are violated and Fouls are committed, the Players will be...