Drying rates of saturated masticated fuelbeds from Rocky Mountain mixed-conifer stands
Robert E. Keane A C , Lisa M. Holsinger A , Helen Y. Smith A and Pamela G. Sikkink B
+ Author Affiliations
- Author Affiliations
A US Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory, 5775 Highway 10 West, Missoula, Montana 59808, USA.
B RTL Networks, Missoula Fire Sciences Laboratory, 5775 Highway 10 West, Missoula, Montana 59808, USA.
C Corresponding author. Email: rkeane@fs.fed.us
International Journal of Wildland Fire 29(1) 57-69 https://doi.org/10.1071/WF19021
Submitted: 12 February 2019 Accepted: 26 October 2019 Published: 26 November 2019
Abstract
Mastication is becoming a popular wildland fuel treatment in the United States but little is known about how masticated fuels dry over time, especially as these atypical fuelbeds age. This report summarises measured drying rates of different-aged masticated fuelbeds built from material collected from sites that were treated using one of four mastication techniques. We recreated three replicates of masticated fuelbeds in wire mesh cages using material collected from 13 sites sampled throughout the US Rocky Mountains. These caged fuelbeds were saturated and then their moisture contents were measured daily as they dried over 10 days in both a controlled growth chamber and outdoors. Relative moisture content after 24 and 96 h of drying and a drying rate were response variables that were analysed across fuel age, drying environment and mastication method. While our sites occurred across different forest types and climates and the mastication equipment used was different, we found that all fuelbeds dried within 3% of the equilibrium moisture contents (3–6%) after ~96 h for both growth chamber and outdoors under moderately dry environments. We also found that mastication method influenced fuelbed drying rates whereas age had little effect. Fire managers may use these drying rates to implement effective prescribed burns to reduce adverse impacts when masticated fuelbeds burn during wildfire conditions.
Additional keywords: fuel drying rate, fuel layers, fuel particles, fuel treatment, mastication, moisture content, ponderosa pine, wildland fuel properties.
References
Anderson HE (1985) Moisture and fine forest fuel response. In ‘Proceedings of the 8th conference on fire and forest meteorology’, Detroit, MI, USA. (Eds LR Donohue and RE Marin) pp. 192–199. (Society of American Foresters: Methsda, MD, USA)Battaglia MA (2013) Mastication effects on fuels, plants, and soils in four western US ecosystems: trends with time-since-treatment. Joint Fire Sciences Program Final Report. (Boise, ID, USA).
Battaglia MA, Rocca ME, Rhoades CC, Ryan MG (2010) Surface fuel loadings within mulching treatments in Colorado coniferous forests. Forest Ecology and Management 260, 1557–1566.
| Surface fuel loadings within mulching treatments in Colorado coniferous forests.Crossref | GoogleScholarGoogle Scholar |
Berg B (2000) Litter decomposition and organic matter turnover in northern forest soils. Forest Ecology and Management 133, 13–22.
| Litter decomposition and organic matter turnover in northern forest soils.Crossref | GoogleScholarGoogle Scholar |
Berry AH, Hesseln H (2004) The effect of the wildland–urban interface on prescribed burning costs in the Pacific north-western United States. Journal of Forestry 102, 33–37.
Berry AH, Donovan G, Hesseln H (2006) Prescribed burning costs and the WUI: economic effects in the Pacific Northwest. Western Journal of Applied Forestry 21, 72–78.
| Prescribed burning costs and the WUI: economic effects in the Pacific Northwest.Crossref | GoogleScholarGoogle Scholar |
Brennan TJ, Keeley JE (2015) Effect of mastication and other mechanical treatments on fuel structure in chaparral. International Journal of Wildland Fire 24, 949–963.
| Effect of mastication and other mechanical treatments on fuel structure in chaparral.Crossref | GoogleScholarGoogle Scholar |
Busse MD, Hubbert KR, Fiddler GO, Shestak CJ, Powers RF (2005) Lethal soil temperatures during burning of masticated forest residues. International Journal of Wildland Fire 14, 267–276.
| Lethal soil temperatures during burning of masticated forest residues.Crossref | GoogleScholarGoogle Scholar |
Droin-Josserand A, Taverdet J, Vergnaud J (1988) Modelling the absorption and desorption of moisture by wood in an atmosphere of constant and programmed relative humidity. Wood Science and Technology 22, 299–310.
| Modelling the absorption and desorption of moisture by wood in an atmosphere of constant and programmed relative humidity.Crossref | GoogleScholarGoogle Scholar |
Edmonds RL (1991) Organic matter decomposition in western United States forests, management and productivity of western-montane forest soils. Pages 118–129 In Harvey, Alan and Leon Neuenswhander (Editors): Proceedings—Management and Productivity of Western-Montane Forest Soils, Boise, ID, April 10-12, 1990 USDA Forest Service, Intermountain Research Station, General Technical Report. INT-280 (Boise, ID, USA)
Fosberg MA, Lancaster JW, Schroeder MJ (1970) Fuel moisture response–drying relationships under standard and field conditions. Forest Science 16, 121–128.
Halbrook J, Han H-S, Graham RT, Jain TB, Denner R (2006) Mastication: a fuel reduction and site preparation alternative. In ‘Proceedings of the 29th Council on Forest Engineering Conference’ 30 July–2 August 2006, Coeur d’Alene, ID. (Eds W Chung, HS Han) pp. 137–146.
Harmon ME, Franklin JF, Swanson FJ, Sollins P, Gregory SV, Lattin JD, Anderson NH, Cline SP, Aumen NG, Sedell JR, Lienkaemper GW, Cromack K, Cummins KW (1986) Ecology of coarse woody debris in temperate ecosystems. Advances in Ecological Research 15, 133–302.
| Ecology of coarse woody debris in temperate ecosystems.Crossref | GoogleScholarGoogle Scholar |
Harrod R, Ohlson P, Flatten L, Peterson D, Ottmar R (2009) A user’s guide to thinning with mastication equipment. USDA Forest Service, Pacific Northwest Region, Okanogan-Wenatchee National Forest. Available at http://www.wy.blm.gov/fireuse/pubs/UsersGuide2Thinning.pdf [Verified 11 August 2011].
Heinsch FA, Sikkink PG, Smith HY, Retzlaff M (2018) Characterizing fire behavior from laboratory burns of multi-aged, mixed-conifer masticated fuels in the western United States. USDA Forest Service, Rocky Mountain Research Station Research Paper RMRS-RP-107 (Fort Collins, CO, USA).
Hood S, Wu R, (2006) Estimating fuel bed loadings in masticated areas. Pages 333–345. In ‘Fuels Management – How to Measure Success’ (Eds PL Andrews, BW Butler) US Department of Agriculture, Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-41 (Portland, OR, USA)
Jain TB, Battaglia MA, Han H-S, Graham RT, Keyes CR, Fried JS, Sandquist JE (2012) A comprehensive guide to fuel management practices for dry mixed conifer forests in the north-western United States. USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-292, (Fort Collins, CO, USA).
Jain T, Sikkink P, Keefe R, Byrne J (2018) To masticate or not: useful tips for treating forest, woodland, and shrubland vegetation. USDA Forest Service, Rocky Mountain Research Station (Fort Collins, CO, USA)
Johnson EA, Miyanishi K (2008) Testing the assumptions of chronosequences in succession. Ecology Letters 11, 419–431.
| Testing the assumptions of chronosequences in succession.Crossref | GoogleScholarGoogle Scholar | 18341585PubMed |
Kane JM, Varner JM, Knapp EE (2009) Novel fuel characteristics associated with mechanical mastication treatments in northern California and south-western Oregon, USA. International Journal of Wildland Fire 18, 686–697.
| Novel fuel characteristics associated with mechanical mastication treatments in northern California and south-western Oregon, USA.Crossref | GoogleScholarGoogle Scholar |
Keane RE (2008) Surface fuel litterfall and decomposition in the northern Rocky Mountains, USA. USDA Forest Service Rocky Mountain Research Station, Research Paper RMRS-RP-70. (Fort Collins, CO, USA)
Keane RE (2015) ‘Wildland fuel fundamentals and applications.’ (Springer: New York, NY, USA)
Keane RE, Sikkink PG, Jain T (2018) Physical and chemical characteristics of surface fuels in masticated mixed-conifer stands of the US Rocky Mountains. USDA Forest Service, Rocky Mountain Research Station, General Technical Report RMRS-GTR-370 (Fort Collins, CO, USA).
Knapp EE, Varner JM, Busse MD, Skinner CN, Shestak CJ (2011) Behaviour and effects of prescribed fire in masticated fuelbeds. International Journal of Wildland Fire 20, 932–945.
| Behaviour and effects of prescribed fire in masticated fuelbeds.Crossref | GoogleScholarGoogle Scholar |
Kreye J, Varner J (2007) Moisture dynamics in masticated fuelbeds: a preliminary analysis. In ‘The fire environment – innovations, management, and policy, Destin, FL’. (Eds BW Butler, W Cook) USDA Forest Service Rocky Mountain Research Station RMRS-P-46CD (Destin, FL) pp. 173–186.
Kreye JK, Varner JM, Knapp EE (2012) Moisture desorption in mechanically masticated fuels: effects of particle fracturing and fuelbed compaction. International Journal of Wildland Fire 21, 894–904.
| Moisture desorption in mechanically masticated fuels: effects of particle fracturing and fuelbed compaction.Crossref | GoogleScholarGoogle Scholar |
Kreye JK, Brewer NW, Morgan P, Varner JM, Smith AMS, Hoffman CM, Ottmar RD (2014) Fire behavior in masticated fuels: a review. Forest Ecology and Management 314, 193–207.
| Fire behavior in masticated fuels: a review.Crossref | GoogleScholarGoogle Scholar |
Kreye JK, Varner JM, Kane JM, Knapp EE, Reed WP (2016) The impact of aging on laboratory fire behaviour in masticated shrub fuelbeds of California and Oregon, USA. International Journal of Wildland Fire 25, 1002–1008.
| The impact of aging on laboratory fire behaviour in masticated shrub fuelbeds of California and Oregon, USA.Crossref | GoogleScholarGoogle Scholar |
Lambert MB, McCleese WL (1977) The San Dimas forestland residue machine. Fire Management Notes Summer, 3–6.
Lyon ZD, Morgan P, Stevens-Rumann CS, Sparks AM, Keefe RF, Smith AMS (2018) Fire behaviour in masticated forest fuels: lab and prescribed fire experiments. International Journal of Wildland Fire 27, 280–292.
| Fire behaviour in masticated forest fuels: lab and prescribed fire experiments.Crossref | GoogleScholarGoogle Scholar |
Matthews S (2013) Dead fuel moisture research: 1991–2012. International Journal of Wildland Fire
McKenzie DW, Makel B (1991) Update: field equipment for precommercial thinning and slash treatment. San Dimas Technology and Development Center. (San Dimas, CA, USA)
Peters B, Bruch C (2003) Drying and pyrolysis of wood particles: experiments and simulation. Journal of Analytical and Applied Pyrolysis 70, 233–250.
| Drying and pyrolysis of wood particles: experiments and simulation.Crossref | GoogleScholarGoogle Scholar |
Pokela RW (1972) Rolling chopper disposes of pine slash. Fire Control Notes 33, 7–8.
Reardon J, Keane RE, Sikkink PG (2019) Smoldering rates of masticated fuelbeds from mixed-conifer stands of the US Rocky Mountains. USDA Forest Service, Rocky Mountain Research Station, (Fort Collins, CO, USA)
Ritter E (1950) Mechanical fire hazard reducer. Fire Control Notes 11, 30–31.
Rummer RB (2006) Cumulative watershed effects of fuels management: a western synthesis. In ‘Forest Operations for Fuel Treatment’, Chapter 4: 1–11. (USDA Forest Service: Washington, DC, USA)
Sikkink PG, Jain TB, Reardon J, Heinsch FA, Keane RE, Butler B, Baggett LS (2017) Effect of particle aging on chemical characteristics, smoldering, and fire behavior in mixed-conifer masticated fuel. Forest Ecology and Management 405, 150–165.
| Effect of particle aging on chemical characteristics, smoldering, and fire behavior in mixed-conifer masticated fuel.Crossref | GoogleScholarGoogle Scholar |
Simard AJ (1968) The moisture content of forest fuels. I – A review of the basic concepts. Department of Forestry and Rural Development, Report No. FF-X-14. (Ottawa, ON, Canada)
Stephens SL, McIver JD, Boerner RE, Fettig CJ, Fontaine JB, Hartsough BR, Kennedy PL, Schwilk DW (2012) The effects of forest fuel-reduction treatments in the United States. Bioscience 62, 549–560.
| The effects of forest fuel-reduction treatments in the United States.Crossref | GoogleScholarGoogle Scholar |
Team R (2014) ‘R: A Language and Environment for Statistical Computing.’ In R Foundation for Statistical Computing (Vienna, Austria)
Viney NR (1991) A review of fine fuel moisture modelling. International Journal of Wildland Fire 1, 215–234.
| A review of fine fuel moisture modelling.Crossref | GoogleScholarGoogle Scholar |
