Montana Logging Utilization, 2002

Abstract

Morgan, Todd A.; Spoelma, Timothy P.; Keegan, Charles E.; Chase, Alfred L.; Thompson, Michael T. 2005 A study of logging utilization in Montana during 2002 provided logging and product utilization data for sawlog and veneer log harvests in Montana. Results of the study indicate a shift toward greater utilization of smaller diameter material, as 78 percent of the harvested volume in Montana during 2002 came from trees less than 17 inches diameter at breast height. The portion of inventory volume utilized is also increasing, as indicated by decreasing removals factors for growing stock (1.081 cubic feet removed from inventory per cubic foot delivered to the mill) and sawtimber trees (0.961 cubic feet removed per cubic foot delivered to the mill). The study also provided factors for converting volumes to and from Scribner and International 1 ⁄ 4 -inch rule log scales, as well as to and from cubic foot volumes.Key words: growing-stock removals, logging residue, sawtimber removals, timber harvest, timber products output, utilization factorsYou may order additional copies of this publication by sending your mailing information in label form through one of the following media. Please specify the publication title and number.

Logging utilization in Idaho: Current and past trends

“…As Morgan and Spoelma (2008) pointed out, it is not possible to know in advance the full population of logging sites in a state for a given year and simply draw a sample of those sites to measure. Harvest volumes and characteristics change from year-to-year and even scheduled harvests may not be executed as planned; so the characteristics of recent harvests are the best predictors of geographic location and ownership of current and future harvests.…”

“…To qualify as a potential measurement tree, it had to be growing stock (live prior to harvest, dbh ≥ 5 inches, and meet minimum merchantability standards) and the entire stem, including the stump and top, had to be measureable (Morgan and Spoelma 2008;Woudenberg and others 2010).…”

“…1) removed from forest inventory during commercial timber harvest activities. The studies also provide information by developing logging utilization factors, which quantify the amount of growing-stock volume cut and either delivered to the mill or left as logging residue in the forest or at the landing (Morgan and Spoelma 2008). These logging utilization factors are used in the calculation of logging residue volumes that are published in the Timber Products Output (TPO) database (http://srsfia2.fs.fed.us/php/tpo_2009/tpo_rpa_int2.php), which is maintained by the Forest Inventory and Analysis (FIA) Program of the USDA Forest Service.…”

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“…1) residue ratio --growing-stock logging residue volume divided by mill-delivered timber volume. The residue ratio can be used to quickly estimate growingstock residue volumes by applying timber harvest volumes at stand, landscape, or state-levels (Morgan and Spoelma 2008). Bole, branch, and foliar biomass (i.e., non-growing stock portions of logging residue) can then be estimated with allometric equations.…”

“…TPO logging utilization studies are an effective and relatively simple way to make estimates of logging residue whether for potential biomass supply or as a component of removals. PNW-GTR-931 Logging utilization studies provide estimates of tree bole residue volumes without the need for detailed tree-level inventories (Morgan and Spoelma 2008). Study results include calculation of the growing-stock 1 (Fig.…”