Collins, Brandon M. Das, Adrian J. Battles, John J. Fry, Danny L. Krasnow, Kevin D. Stephens, Scott L. 2014 tabular digital data Fort Collins, CO Forest Service Research Data Archive https://doi.org/10.2737/RDS-2014-0023 This data publication contains tree density and biomass, shrub cover, and tree ring widths measured at the Blodgett Forest Research Station in the northern Sierra Nevada in California between 2001 and 2009. Plot treatments included mechanical, fire, mechanical followed by prescribed fire, and a control. Both pre- and post-treatment data are included. Specifically, the following plot-level data are included: 1) pre- and post-treatment (3 and 7 year) live tree density (in four size classes); 2) pre- and post-treatment (3 and 7 year) live tree biomass; 3) post-treatment (7 year) shrub cover; and 4) post-treatment (7 year) large snag. Tree ring widths from increment cores collected at each plot are also included. These data were collected to investigate the effects of fuel and restoration treatments on potential fire hazard, forest structure, and forest health. The treatments studied were part of the National Fire and Fire Surrogate Study (see McIver et al. 2009). Original metadata date was 11/14/2014. Minor metadata updates on 07/01/2016, which included updating the citation information for the associated journal article (Collins et al. 2014). Minor metadata updates on 12/14/2016. 2001 2009 ground condition Complete Unknown University of California, Center for Forestry, Blodgett Forest Research Station (El Dorado Country, California, USA) -120.67929 -120.64012 38.92674 38.86587 ISO 19115 Topic Category biota environment National Research & Development Taxonomy Natural Resource Management and Use Forest management None mixed-conifer forest fuel treatments prescribed fire sugar pine Pinus lambertiana ponderosa pine Pinus ponderosa white fir Abies concolor incense-cedar Calocedrus decurrens Douglas-fir Pseudotsuga menziesii Joint Fire Science Program JFSP None Sierra Nevada California Blodgett Forest Site None plants multiple species ITIS 2014 database Retrieved [October, 10, 2014] https://www.itis.gov Vegetation was identified to species when possible. Some species which were minor components of the study area were identified to genus. Kingdom Plantae plantes Planta Vegetal plants Subkingdom Viridaeplantae green plants Infrakingdom Streptophyta land plants Division Tracheophyta vascular plants tracheophytes Subdivision Spermatophytina spermatophytes seed plants phanérogames Infradivision Gymnospermae gymnosperms gymnospermes gimnosperma Class Pinopsida conifers Order Pinales pines Family Pinaceae pines Genus Abies fir Species Abies concolor balsam fir silver fir Colorado fir concolor fir white balsam oyamel de California white fir Genus Pinus pine Species Pinus lambertiana sugar pine California sugar pine pino de azúcar Species Pinus ponderosa ponderosa pine bull pine western yellow pine blackjack pine pinabete rock pine Genus Pseudotsuga Douglas-fir Species Pseudotsuga menziesii red fir Douglas spruce Oregon pine Douglas-fir Order Cupressales Family Cupressaceae cypress redwood Genus Calocedrus incense cedar Species Calocedrus decurrens incense cedar None These data were collected using funding from the U.S. Government and can be used without additional permissions or fees. If you use these data in a publication, presentation, or other research product please use the citation below when citing the data product: Collins, Brandon M.; Das, Adrian J.; Battles, John J.; Fry, Danny L.; Krasnow, Kevin D.; Stephens, Scott L. 2014. Forest structure and tree ring widths from the Fire and Fire Surrogate Study - Blodgett Forest Site. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2014-0023 \Supplements\BlodgettFFS_plot_maps.pdf Adobe Acrobat PDF file containing 13 different contour maps of the Blodgett Forest Research Station Fire and Fire Surrogate Study. Maps show plot locations for each treatment and compartment. PDF Funding for this project provided by Joint Fire Science Program (JFSP # 10-1-10-21): https://www.firescience.gov. Funding also provided by USDA Forest Service, Pacific Southwest Research Station. Collins, Brandon M. Das, Adrian J. Battles, John J. Fry, Danny L. Krasnow, Kevin D. Stephens, Scott L. 2014 journal article Ecological Applications 24(8):1879–1886 https://doi.org/10.1890/14-0971.1 Although we did not perform a formal accuracy assessment, consistency across measurement time periods allow us to conclude that these data are reasonably accurate. Data were checked for erroneous observations. Where observations noticeably exceeded known maximum values (e.g., tree diameters) plots were revisited and new measurements were made. Plots missing measurements in any of the three measurements: pre-treatment, 2001; 1 year post-treatment, 2003; or 7 year post-treatment, 2009 were removed. Field National Fire and Fire Surrogate Study Treatments: Three different fuel treatments were tested: mechanical-only (MECH), mechanical-plus-fire (MECHFIRE), and prescribed-fire-only (FIRE), as well as untreated control (CONT), which were each randomly applied (complete randomized design) to 3 of 12 experimental units that varied in size from 14 to 29 hectares (ha). CONT units received no treatment during the study period (2000-2012). MECH units had a two-stage prescription; in 2001 stands were crown thinned followed by thinning from below to maximize crown spacing while retaining 28 to 34 square meters / ha of basal area with the goal to produce an even species mix of residual conifers with little overlap of live crowns in dominant and co-dominant trees (Stephens and Moghaddas 2005). Following the harvest, approximately 90% of understory conifers and hardwoods up to 25 centimeters (cm) diameter-at-breast-height (DBH) were masticated in place using an excavator mounted rotary masticator. Mastication shreds and chips standing small diameter live and dead trees in place and this material was not removed from the experimental units. The remaining un-masticated understory trees were left in scattered clumps of 0.04 to 0.20 ha in size. MECHFIRE units underwent the same treatment as MECH units, but in addition, they were prescribed burned using a backing fire. FIRE units were burned with no pre-treatment using strip head-fires. All prescribed burning was conducted during a short period (10/23/2002 to 11/6/2002) with the majority of burning being done at night because relative humidity, temperature, wind speed, and fuel moistures were within pre-determined levels to produce the desired fire effects. Data measured: Individual plots were placed on a systematic 60 meter (m) grid with a random starting point. Plot centers were permanently marked with a pipe and by tagging witness trees to facilitate plot relocation after treatments. Tree species, status (live/dead), DBH, total height, height to live crown base, and crown position (dominant, co-dominant, intermediate, and suppressed) were recorded for all trees greater than 10 cm DBH. Woody shrubs were also sampled for cover on three, 11.3 m transects (with randomly chosen azimuths from plot center) using transect intersections. Increment cores were collected from 7-10 trees within each of the following stratum combinations: 1) five dominant conifer species (white fir [Abies concolor], incense-cedar [Calocedrus decurrens], Douglas-fir [Pseudotsuga menziesii var. menziesii], sugar pine [Pinus lambertiana], ponderosa pine [Pinus ponderosa], and black oak [Quercus kelloggii], 2) three DBH classes (25.1 - 50 cm, 50.1 - 75 cm, and > 75 cm), and 3) four treatment types (CONT=control, MECH=mechanical only, MECHFIRE=mechanical followed by prescribed fire, and FIRE=prescribed fire only). There were some combinations in which only 2-6 trees were cored, due to lack of availability: >=75 cm DBH white fir and sugar pine, and 25.1-50 cm DBH sugar and ponderosa pine. * At this time, not all of the data described above are available through this data publication. See the entity and attributes section for a complete list of available data. Collins, Brandon M. Das, Adrian J. Battles, John J. Fry, Danny L. Krasnow, Kevin D. Stephens, Scott L. 2014 journal article Ecological Applications 24(8):1879–1886 https://doi.org/10.1890/14-0971.1 McIver, James Stephens, Scott L. Youngblood, Andrew 2009 journal article Ecological Society of America 19:283-284 //www.treesearch.fs.fed.us/pubs/34602 Stephens, Scott L. Moghaddas, Jason J. 2005 journal article Forest Ecology and Management 214: 53-64 We used species-specific regional volume equations and wood density estimates to calculate biomass to maintain consistency with long-standing procedures employed by the Forest Inventory and Analysis Program. Zhou, Xiaoping; Hemstrom, Miles A. 2009. Estimating aboveground tree biomass on forest land in the Pacific Northwest: a comparison of approaches. Res. Pap. PNW-RP-584. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 18 p. //www.treesearch.fs.fed.us/pubs/34067 Unknown This data publication contains four comma-delimited ASCII text files. Below you will find a list of those files along with a complete description of the variables contained within each file. \Data\Live_tree_density_biomass.csv contains pre- and post-treatment live tree density and live tree biomass. Variables include the following: Timing = Treatment timing (Pre = pre-treatment (2001), Post1 = 1 year post-treatment (2003), Post7 - 7 years post-treatment (2009)). Treatment = Treatment type (cont=control, mech=mechanical only, mechfire=mechanical followed by prescribed fire, and fire=prescribed fire only). Unit = Treatment unit (also called compartment). Plot = Plot number. TPH_SZ1 = Tree density (trees per hectare) from 0.1 to 25.0 cm DBH. TPH_SZ2 = Tree density (trees per hectare) from 25.0 to 50.0 cm DBH. TPH_SZ3 = Tree density (trees per hectare) from 50.1 to 75.0 cm DBH. TPH_SZ4 = Tree density (trees per hectare) > 75.0 cm DBH. TPHsum_GT25 = Tree density (trees per hectare) greater than 25.0 cm DBH. LiveTreeBiomass = Live tree biomass (milligrams per hectare). \Data\Shrub_post_7yr.csv contains plot shrub cover measured 7 years after treatment implementation (2009). Variables include the following: Treatment = Treatment type (cont=control, mech=mechanical only, mechfire=mechanical followed by prescribed fire, and fire=prescribed fire only). Unit = Treatment unit (also called compartment). Plot = Plot number. shbcvr = Shrub cover percentage (0-100). \Data\Snag_post_7yr.csv contains new snags added between 2003 and 2009. Variables include the following: Treatment = Treatment type (cont=control, mech=mechanical only, mechfire=mechanical followed by prescribed fire, and fire=prescribed fire only). Unit = Treatment unit (also called compartment). Plot = Plot number. snaggt50 = Number of new snags between 2003 and 2009 PER PLOT that were greater than 50 cm DBH. \Data\Tree_ring_widths.csv contains annual tree ring widths measured using digital sliding stage. Variables include the following: Treatment = Treatment type (cont=control, mech=mechanical only, mechfire=mechanical followed by prescribed fire, and fire=prescribed fire only). Unit = Treatment unit (also called compartment). Plot = Plot number. Tree = Tree number. Species = Tree species: PILA = sugar pine (Pinus lambertiana), PIPO = ponderosa pine (Pinus ponderosa), ABCO = white fir (Abies concolor) CADE = incense-cedar (Calocedrus decurrens), and PSME = Douglas-fir (Pseudotsuga menziesii). 2009 DBH = Diameter at breast height (cm) measured in 2009. slope = Position of extracted tree core (C = along the contour, U = upslope). 1945 - 2010 = Measured tree ring widths (micrometers) for the specified year (one per column). Collins et al. (2014) USDA Forest Service, Research and Development Research Data Archivist mailing and physical

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