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ee TECHNICAL PAPER No. 48 os JULY 1960

SLASH WEIGHT TABLES FOR WESTSIDE MIXED CONIFERS

CRAIG C. CHANDLER

PACIFIC SOUTHWEST FOREST AND RANGE EXPERIMENT STATION

BERKELEY - CALIFORNIA

FOREST SERVICE -U. S. DEPARTMENT OF AGRICULTURE

SLASH WEIGHT TABLES FOR WESTSIDE MIXED CONIFERS

Craig C. Chandler

CONTENTS Page Introduction - -----+-+---+-+---- 1 Tables Dry weight of slash Ponderosa pine - - - ------ 3 Sugar pine - ---------- 6 Douglas-fir ---------- 10 White fir --------+---- 14 Incense cedar - -------- a Dry weight of cull logs and chunks - 20 Dry weight of slash from thinnings - el Technical Paper 48 July 1960

U. S. DEPARTMENT OF AGRICULTURE--FOREST SERVICE PACIFIC SOUTHWEST FOREST AND RANGE EXPERIMENT STATION

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SLASH WEIGHT TABLES FOR WESTSIDE MIXED CONIFERS

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yg iCrasien C wiChandalen Divisicn cf Forest Fire Research

The need for, and difficulty of, any slash disposal job depends to a large extent on the quantity and size distribution of slash on the cutover area. Usually the amount of slash is presumed to be proportional to the board-foot volume of timber cut, but this presumption is a very rough approximation because it ignores two inpomvanu Variables: ‘species and size of tree.

This report presents information on quantity and size of Sikash™ to be. expected from trees of the five predominant species of the Westside mixed-conifer timber type in California. The main segment of information is a set of 18 tables giving the oven-dry welght om slash in three size classes*and by.tree diameter. Basic data were obtained from the publication and original work notes of Storey, Fons, and Sauer (1955) and from volume tables by Dunning (1945), Hornibrook and Hartong (1942), and Mitchell (1918). For UMIRnOmMG vee cocee Volumes tor all species have been calculated, by the Scribner log rule to an 8-inch top diameter, inside bark.

These slash tables are of the "flat factor" type. Like the flat factor cull and breakage factors of Kimmey (1954), values from these tables should be applied to extensive stands and not to individual trees.

Besides collecting the type of cruise data needed to apply cull factors, those who apply these tables must record the llengthom dave" crown -as'.a percent of total tree height. However, crown length need not be tallied for each tree; an average for each species and size group in the stand should suffice.

Two other tables present information for cull logs and small trees. Since cull logs may add appreciably to the total amount of slash, a separate table is included for determining the dry weight of cull. Data for this table were obtained from the Forestry Handbook (Forbes, 1955, p. 1.47) and the Wood Hand- book (U. S. Forest Service, 1940, pp. 50-53).

The final table lists the total dry weight of small diameter trees. This table is intended for calculating the relative hazard from thinning operations. Data for the table were taken entirely from the field notes of Storey and co-workers.

/weihe major computing work for these tables was performed

by Robert L. Rennie.

(7)

LITERATURE CITED

Dunning, D. 1945. Diameter class volume tables for California old-growth timber. U. S. Forest Serv., Calif. Forest and Range Expt. Sta., Forest Research Note 42, 4 pp.

HORDES a kin De 1955. Forestry handbook. The Ronald Press Co., N.Y., 1142 pp.

Hornibrook, I. M. .. and Hartong, A. i. 1942. Local volume table for Douglas-fir. U. S. Forest Serv., Calif .5Horestsand Range txpire Stas sp. (processed).

Kimmey, J. W. 1954. Cull and breakage factors for pines and incense-cedar in, the Sierra Wevada. U- os. Hocesc serve, Calat forest and Range Expt. Sta. Forest Research Note 90, 4 pp.

Mitchell, J. A. 1918). --Imeense=cedar. “Us S. Deps., Aer.. Bull. 60k, 40 pps. illus.

Stomeye IWiGer) Ponsa iWe espe eeociae tae bhos Ni 1955. Crown characteristics of several coniferous tree species. AFSWP Interim Technical Report No. 416. U.S. Dept. Agr. HOBESE ASSIS eeu o Omit ele acy

U.. S.. Forest Service, Forest Products Laboratory 1940. Wood handbook. U. S. Dept. Agr., 326 pp., illus.

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SOE

DRY WEIGHT CF CULL LCGS AND CiilUNKS

Diameter : ; : :Sugar pine, at small : Douglas- 7) (Ponderosa: ss wiakiqemrrelaae end, in. 3 abet 3 pine :incense~cedar _

Pounds per MBF cul!

12-18 3,500 3 2 2,730 20-28 3,280 2,920 21 5)5,0) 30-38 3, 080 2,740 2,400 40-43 2,940 2,520 2,290 50-58 2,800 2,500 2,180 50-68 2,660 2537/0 2,070

ay) Volume of cull in board feet may be obtained — either from published cull’ factors or by subtractau= nes volume from gross volume in original cruise data.

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