Treesearch

A selected list of 373 references pertaining to tree improvement in the genus Abies.

The specific gravity of the wood of 14 conifers grown in Hawaii was measured by means of increment cores. Most species were growing in environments quite different from their native habitats. The specific gravity and growth characteristics under several site conditions were compared. Described in some detail are Norfolk-Island-pine, slash pine, Jeffrey pine, jelecote pine, cluster pine, Monterey pine, and loblolly pine. More limited information is given for shortleaf pine, Luzon pine, Masson pine, long-leaf pine, eastern white pine, Yunnan pine, and Douglas-fir.

A cost accounting analysis of full-scale logging operations in old-growth redwood during 2 years revealed that it cost $12.24 per M bd. ft. (gross Scribner log scale) to get logs on trucks. Road development costs averaged another $5.19 per M bd. ft. Felling-bucking production was calculated by average tree d.b.h. Both skidding and loading outputs per hour were determined by average log volume for a landing area and for a short time period. Costs of logging were highest on shelterwood, and lowest and about equal on the selection and clear cuttings.

Males 30-50 years of age from the smaller urban centers (under 25,000 population) make up the bulk of the California hunter population. They are mainly from the skilled-semiskilled and professional-managerial occupations. Their level of knowledge about forest fire prevention is generally high, but their knowledge is weak in some pertinent areas. Most frequently reported sources of information about fire prevention are forest rangers, signs, and Smokey Bear.

Seed trees were selected in young-growth ponderosa pine to produce an estimated 25,000, 50,000, and 100,000 seeds per acre. A year after a good seed crop, ponderosa pine stocking in cutover plots was: 1,910, 4,020, and 4,820 seedlings per acre. Some additional regeneration of other species also occurred.

The job of watershed management research is to conduct studies which will suggest better methods of management for water and predict the effects of a wide span of land management practices upon streamflow, water yield, and sedimentation. A program for watershed management research was prepared by Henry Anderson in 1960 (Anderson, 1960).

"Do you know of any fuel-breaks that were actually used to stop a fire under severe burning conditions?" This question was asked at the last meeting of the Fuel-Break Executive Committee. And a request was made that we report examples of how fuel-breaks have been used successfully in control of fires, or where they have failed to aid in fire suppression. Naturally, we prefer to start our reports with the successful use of the Glendora Ridge Fuel-Break. It was only partially completed at the time. Yet local fire bosses think this break already has shown some of the values of the fuel-break...