Treesearch

The Station has received recent inquiries regarding site index curves for species other than the mixed hardwood stands for which such data are already available, The attached curves for second growth yellow poplar and white pine will be found suitable for approximate site determinations in the Southern Appachians. The white pine curves are based upon measurements of 376 dominant and codominant trees growing in mixture with hardwoods, a common form of occurrence in the Southern Appalachians. The poplar curves were based on the height-age relationship of the average tree in the dominant...

This number of Forest Research Motes is primarily for the forest fire protectionist. It consists of a number of very short articles, each of which gives the essence of the results of a study made recently by this Forest Experiment Station. These so-called fire studies which are represented herein by brief fragments are all part of an organized research program, having as its objective the betterment of forest fire prevention, detection, and control.

The outstanding publication of this Forest Experiment Station in recent weeks is the bulletin of the above title by Axel J.F. Brandstrom, Senior Forest Economist. Through the generosity of the Charles Lathrop Pack Forestry Foundation and the cooperation of the West Coast Lumbermen's Association, an edition of 2500 has been printed. Most of the edition has been distributed to lumbermen, foresters and librarians. This bulletin of 115 pages of text, 47 illustrations and 54 tables has attracted much attention and its conclusions have been much discussed. It has undoubtedly started some new...

This inquiry, originally conceived as an effort to determine definitely whether the existing lack of adequate and practical forest fire insurance facilities is in truth unavoidable and, if possible, to suggest means whereby the condition might be remedied, finds no apparent reason why successful forest fire insurance should not be possible as far as the loss situation is concerned. There do not, furthermore, appear to be any serious deterrents from the underwriting or administrative point of view. Technical difficulties are no greater than those that have successfully been met in lines of...

An adequate expression for density of stocking in even-aged forests has long been sought by foresters. Comparison of total basal area of the stand with yield-table values of basal area for the same age and site quality has been the usual method of evaluating stand density. Other methods have been proposed, but none has given results good enough to warrant general adoption or displacement of the basal-area method. It is the purpose of this paper to present a stand-density index which does not require a yield table and which is not affected by possible errors in shape of tho total basal...

The conifer forests of the CaUfomia mountains are among the most valuable in North America. The character of the tree species forming the stands, the large dimensions attained by individual trees, the heavy yields, the extensive area occupied, and its comparative accessibihty contribute to high values.

Data from 317 oaks and yellow poplars wounded by a spring fire in Virginia were analyzed by means of multiple linear correlation. A method was obtained whereby the size of wound can be predicted provided the areas of discolored bark and diameters of injured trees are known. The method of prediction so far is safely applicable only to groups of trees similar to those studied. Of the species examined, yellow poplar was most resistant to basal damage, scarlet oak was the most susceptible, and black, white and chestnut oak were intermediate.https://doi.org/10.1093/jof/31.7.829

Silvicultural practice for the national forests in the mixed western white pine stands of northern Idaho has long been complicated by the economic problems arising from the presence of aggressive, tolerant, low-value species, such as western hemlock (Tsuga heterophylla) and lowland white fir (Abies grandis), in association with the less tolerant, faster-growing, high-value western white pine (Pinus monticola). Purely silvicultural measures to encourage the germination and survival of white pine (for example, the creation of more favorable light conditions on cut-over areas through the...