bluuebunny/crossref_metadata_2025_split huggingface dataset:
Twenty-Five-Year Growth and Mortality of Planted Ponderosa Pine Repeatedly Thinned to Different Stand Densities in Northern California
Authors: Oliver William W. 
Published: August 2019

Abstract
A 20 yr old ponderosa pine (Pinus ponderosa var. ponderosa) plantation on a productive site on the west slope of the Sierra Nevada in northern California was thinned four times over a 25 yr period. Stand densities tested were Stand Density Indexes (SDI) of 73, 128, 183, 238, and 293 (equivalent to 40,70,100,130, and 160 ft2/ac of basal area), replicated three times in a randomized design. Growth was analyzed for each of five 5 yr periods. Periodic annual increments (PAI) of diameter, net basal area, and net total volume differed significantly among periods and, in the earlier periods, among stocking levels. Mortality from winter storms and bark beetles was largely confined to the higher stand densities and in periods 3 and 4 caused PAIs of net basal area and net total volume to decline below that of lower densities. The sensitivity of mortality to stand density suggests a thinning target of SDI 183 (about 100 ft²/ac of basal area) for similar stands—no higher than that recommended for eastside stands of much lower site productivity. This sensitivity coupled with rapid growth suggests that multiple thinnings will be necessary in similar stands to maintain healthy, vigorous trees. West. J. Appl. For. 12(4):122-130.
Increased Value through Optimal Bucking
Authors: Bowers Steve 
Published: August 2019

Abstract
This study documented and field-tested computerized optimal bucking procedures in second-growth Douglas-fir (Pseudotsuga menziesii), comparing computerized bucking solution to the solution of two timber cutters. The increase in the number of logs was negligible; the computer solution often did not use the entire merchantable tree stem. Log volume and value differed between these two solutions primarily because of the locations of long logs versus short logs in the tree. Volume increased 9.5% and value increased 9.3% for 85 trees in the optimal bucking compared with the cutter's solution. West. J. Appl. For. 13(3):85-89.
Propagating Native Species: Experience at the Wind River Nursery
Authors: Harrington Constance A. , McGrath James M. , Kraft Joseph M. 
Published: August 2019

Abstract
Propagation information developed at the USDA Forest Service Wind River Nursery in Carson, WA, is provided for 9 hardwood tree and 30 shrub species native to the Pacific Northwest. This includes information on: seed collection, extraction, stratification, and storage; timing of collection and propagation techniques for cuttings; and a summary of propagation experience (planting media and container used, specialized methods, and type of stock produced). Most species were propagated from seed, some from stem or root cuttings, and some from both seed and cuttings. Some species were very difficult or impossible to propagate at the nursery. West. J. Appl. For. 14(2):61-64.
Clearwood Quality and Softwood Lumber Prices: What's the Real Premium?
Authors: Waggener Thomas R. , Fight Roger D. 
Published: August 2019

Abstract
Diminishing quantities of appearance grade lumber and rising price premiums for it have accompanied the transition from old-growth to young-growth timber. The price premiums for better grades are an incentive for producers to undertake investments to increase the yield of those higher valued products. Price premiums, however, are also an incentive for users to substitute lower grades, lower priced species, or nonwood materials for these higher priced appearance grades. This possibility may cast doubt on the permanence of the price premiums associated with appearance grade lumber. The real price premiums paid for appearance grades of lumber from January 1989 through October 1995 were substantial and quite stable during a widely fluctuating softwood lumber market. We found little or no evidence to suggest that these premiums are either "temporary" or are in decline. Although care is required in extrapolating these findings over future long time horizons typically required for silvicultural investments in wood quality changes, the results of this study may help forest managers better understand the possible magnitude of real price premiums to use in evaluating those investments. West. J. Appl. For. 14(2):73-79.
Weed Control in Spring and Summer After Fall Application of Sulfometuron
Authors: Ketchum J. Scott , Rose Robin , Kelpsas Bruce 
Published: August 2019

Abstract
This study tested the residual spring and summer efficacy of sulfometuron after fall applications in forest regeneration settings in coastal forests of Oregon. This is the first reporting of results from what is becoming a more widely used silvicultural treatment. Sulfometuron alone (S) and sulfometuron plus imazapyr and glyphosate (SIG) were applied to vegetation on mechanically scarified sites and unscarified sites. The applications were replicated each month through fall 1994. Vegetation cover was assessed in mid-June and mid-August 1995. The SIG treatment controlled the vegetation more than the S treatment did, although cover was significantly lower for both herbicide treatments (9% to 54% for summed cover) compared to the control (64% to 104% for summed cover). On scarified sites, the month of application, early or late fall, did not significantly influence the efficacy of S or SIG treatments. On unscarified sites, however, later applications of the SIG treatment were less effective than earlier treatments were. These results suggest that fall applications of sulfometuron are still effective in spring and may eliminate the need to retreat sites in the spring to achieve effective weed control. West. J. Appl. For. 14(2):80-85.
Evaluation of Physical Barriers to Protect Ponderosa Pine Seedlings from Pocket Gophers
Authors: Pipas Michael J. , Witmer Gary W. 
Published: August 2019

Abstract
A 2 yr study on the Rogue River and Mt. Hood National Forests in Oregon evaluated physical barriers for protection of Pinus ponderosa seedlings against damage by Thomomys talpoides. Seedlings protected with one of three weights of: (1) plastic mesh tubing (Vexar®) or (2) sandpapertubing (Durite®) were evaluated against control seedlings. On the Rogue River sites, Vexar® seedlings had the highest survival (62.6%), followed by the controls (59.1%), then Durite® seedlings (17.9%). Gophers were the primary cause of death for the Vexar® seedlings, versus desiccation for the Durite® seedlings. On the Mt. Hood sites, heavyweight Vexar® seedlings had the highest survival (35.4%), medium-weight Durite® seedlings the lowest (2.7%). Seedling mortality caused by gophers was highest for controls (70.2%), followed by light-weight (62.2%) and heavy-weight (53.9%) Vexar® treatments. Overall survival was low (Rogue River = 42%, Mt. Hood = 19.8%). Growth was greatest for the control seedlings but only significantly greater than growth of Durite® seedlings on the Rogue River sites. Growth of seedlings was not compromised by the Vexar® tubing. Although neither type of tubing was highly protective, Vexar® tubes performed better than Durite® tubes. West. J. Appl. For. 14(3):164-168.
Development of a Shrub-Fern-Ponderosa Pine Community Eleven Years After Site Preparation and Release
Authors: McDonald Philip M. , Abbott Celeste S. , Fiddler Gary O. 
Published: August 2019

Abstract
Vegetation management can direct trends in early plant development and species succession and through various treatments achieve specific combinations of species desired by the ecosystem manager. Density and development of several plant species were studied in an area in northern California that was planted with 1-yr-oldponderosa pine (Pinus ponderosa var. ponderosa) seedlings in 1986 and treated with three herbicides (Velpar L, Garlon 4, Escort) in fall 1986 and spring 1987. Abundant species in the new plantation were bush chinquapin (Chrysolepis sempervirens) that regenerated from root crowns, greenleaf manzanita (Arctostaphylos patula)from seed, and bracken fern (Pteridium aquilinum var. pubescens )from rhizomes. After 11 growing seasons, chinquapin sprouts in the control averaged more than 15,900/ac, manzanita seedlings over 16,400/ac, and bracken fronds 11,400/ac. Mean ponderosa pine diameter (5.1 in.), height (12.9 ft), and crown diameter (7.6 ft) were significantly greater in the Velpar treatment than in the control. Additional information is presented on plant diversity, the onset of statistically significant differences among treatments for pine, and the makeup of the plant community in the near future. West. J. Appl. For. 14(4):194-199.
Damage Characteristics in Young Douglas-Fir Stands from Commercial Thinning with Four Timber Harvesting Systems
Authors: Han Han-Sup , Kellogg Loren D. 
Published: August 2019

Abstract
Damage to residual trees from commercial thinning was characterized and compared among four common harvesting systems in western Oregon: tractor, cut-to-length, skyline, and helicopter. Six young (30- to 50-yr-old) Douglas-fir (Pseudotsuga menziesii) stands with various residual densities were studied: Scarring was the most typical damage to crop trees, accounting for 90% of the total damage in most cases. Damage levels greatly decreased as the minimum scar size that defines damage was increased. Scarring by ground-based systems was more severe: scars were larger, and gouge and root damage were more prevalent than in skyline and helicopter systems. Damaged trees were concentrated within 15 ft of skid trails or skyline corridor centerlines. In the cut-to-length system, the harvester caused more wounding (70%) to crop trees than did the forwarder (30%), but forwarder scars were larger and sustained severe gouging. Recommendations for minimizing stand damage are included. West. J. Appl. For. 15(1):27-33.
Evaluating the Accuracy of Ground-Based Hemlock Dwarf Mistletoe Rating: A Case Study Using the Wind River Canopy Crane
Authors: Shaw David , Freeman Elizabeth A. , Mathiasen Robert L. 
Published: August 2019

Abstract
The accuracy of ground based estimates using the six-class dwarf mistletoe rating system was evaluated in an old-growth Douglas-fir/western hemlock forest by comparing ground ratings by five different observers to an examination of tree crowns from a construction crane at the Wind River Canopy Crane Research Facility, Washington. A total of 139 dominant, codominant, and intermediate western hemlock were evaluated. No consistent pattern emerged to indicate where overall error was made. All but one observer was relatively accurate at identifying noninfected trees (73 to 95% noninfected trees accurately rated by four observers). However, the observers were less accurate at estimating the DMR class of the infected trees (11% to 3 7% of the infected trees accurately rated), including a number of trees incorrectly rated by two or more DMR classes. One observer rated 98% of the trees as having infections, while the crane survey estimated only 53% of the trees as having infections. Each observer divided the individual tree crowns into thirds and estimated infections based on summing lower, middle, and upper canopy levels. There was no pattern to the errors associated with estimates by canopy level. One observer significantly overestimated all canopy levels, one observer estimated all accurately, one observer significantly underestimated all canopy levels, one observer underestimated the mid and upper canopies, and one observer underestimated the lower and upper canopies. The principal reasons for inaccurate dwarf mistletoe ratings were assumed to be difficulty in accurately estimating crown thirds, misidentification of infections because of various stem deformities or accumulation of organic debris resembling infections, and the difficulty in observing infections high above the ground and through dense vegetation. Only one of the five observers accurately represented the spatial pattern of the infection center. The implications of this research vary depending on whether the results are to be used for timber management or for research and modeling applications. West. J. Appl. For. 15(1):8-14.
Damage to Residual Trees and Advance Regeneration from Skyline and Forwarder Yarding in Mixed-Conifer Stands of Northeastern Oregon
Authors: Youngblood Andrew 
Published: August 2019

Abstract
Reducing the risk of occurrence of wildfire and outbreaks of insects and diseases through fuel reduction is a priority management objective on federal lands within the Blue Mountains in northeastern Oregon. Optimal methods to achieve desired levels of fuel in mixed conifer stands by mechanical means are as yet unknown. One factor essential in evaluating optimal fuel reduction methods is the damage to residual trees and advance regeneration associated with specific combinations of stand condition, prescription, and harvesting system. Residual stem damage on 12,899 stems was compared after partial cutting and yarding with either skyline or ground-based forwarder in mixed conifer stands of northeastern Oregon. There were 6,092 occurrences of damage on 4,074 stems after yarding; 4.1% of the damaged stems had crushed foliage, 15.4% had a broken terminal leader, 26.5% had broken branches, 28.9% were wrenched, 35.0% had scraped bark, and 38.9% had bole scars. Fir (Abies grandis and A. lasiocarpa) seedlings were more frequently damaged than nonfir (Larix occidentalis, Picea engelmannii, and Pinus contorta) seedlings, and the most frequent damage to fir seedlings occurred in units treated by the forwarder. More damage occurred to residual large trees during yarding than to seedlings. Forwarder yarding resulted in slightly more damage to trees than did skyline yarding. Wrenching was generally consistent between residual seedlings and trees. Scarring occurred more frequently to residual trees than to seedlings. Mean scar area per tree on those actually scarred was generally about 40 cm² on seedlings and 256 cm² on residual trees. Despite slight differences in stand damage, both yarding methods met the silviculture prescription of reducing fuel and protecting large western latch, Engelmann spruce, Douglas-fir, and lodgepole pine stems targeted for retention. This suggests that the decision by resource managers to use one method of yarding over the other should probably be based on considerations such as availability of equipment, costs, and soil impacts. West. J. Appl. For. 15(2):101-107.
Inoculum Reduction Measures to Control Armillaria Root Disease in a Severely Infested Stand of Ponderosa Pine in South-Central Washington: 20 Year Results
Authors: Roth Lewis F. , Shaw Charles G. , Rolph Leonard 
Published: August 2019

Abstract
A stand of ponderosa pine (Pinus ponderosa) severely impacted by Armillaria root disease was treated with five different levels of sanitation by root removal in an attempt to reduce losses to root disease in the regenerating stand. Treatments included: (1) Trees pushed out, maximum removal of roots by machine, visible remaining roots picked out by hand; (2) Trees pushed out, maximum removal of roots by machine; (3) Trees pushed out, no further removal of roots; (4) Trees pushed out, large stumps left, otherwise maximum removal of roots by machine; (5) Clear logged, sod scalped between the stumps, stumps retained. After 20 yr there was a general reduction in mortality with improved sanitation, although treatment #3 was less effective than expected. In each type of stand regeneration (thinned, unthinned, and planted), only treatment #1 consistently expressed less mortality than the other treatments, and differences were significant in the thinned and unthinned portions of the experiment between treatments #1 and #5. Crop tree height and diameter growth after 20 yr were also best in treatment #1. These results do not necessarily indicate that push-over logging is ineffective, but rather they show that after trees and intact stumps have been pushed out, further cleaning is needed to reach the satisfactory sanitation level achieved in treatment #1. Hand cleaning as done in treatment #1 would certainly be cost prohibitive, but perhaps that level of root removal could be achieved in light textured soils with judicious use of a land-clearing brush rake. West. J. Appl. For. 15(2):92-100.
Effectiveness of Repeated Manual Cutting and Glyphosate for Release of Engelmann Spruce from Mixed-Shrub Herb Vegetation
Authors: Comeau P. G. , Biring B. S. , Harper G. J. 
Published: August 2019

Abstract
This study, initiated in 1992, examined the effectiveness of repeated cutting for controlling vegetation in a mixed-shrub-herb community to release planted Engelmann spruce (Picea engelmannii) seedlings. Eight treatments were compared: (a) cut once in spring of 1992, (b) cut once in summer of 1992, (c) 3 yr of cutting once annually in the spring (mid to late June) starting in 1992, (d) 3 yr of cutting once annually in the summer (late July) starting in 1992, (e) 3 yr of cutting twice annually, in the spring and in the summer starting in 1992, (f) 2 yr of cutting twice annually, in the spring and in the summer starting in 1993, (g) application of glyphosate herbicide at 2.1 kg ai/ha during late August, 1992, and (h) an untreated control. Treatments were replicated 3 times in 30 × 30 m plots. Glyphosate treatment (g) and spring cutting treatments (c, e, and J) significantly reduced vegetation (vascular plant) cover and height compared to the control in 1993 and 1994. There were no significant differences in vegetation cover among treatments in year 5 (1996), but vegetation height was significantly lower in the glyphosate treatment (g) and repeated cutting treatments (c, d, e, and f) compared to the control. After 5 yr, spruce survival was high for both control (86%) and treated (> 91%) plots, with no significant (P ≤ 0.05) differences detected among treatments. Repeated cutting treatments (c, d, e, and f) and glyphosate treatment (g) significantly increased root collar diameter (rcd) over that of untreated (h) seedlings, and repeated summer cutting (d) significantly increased seedling height. Three years of repeated cutting (c, d, and e) increased rcd by 54%, and glyphosate (g) increased rcd by 46% compared to the control (h). At the end of year 5, seedlings receiving 3 yr of cutting (e) were not significantly larger than seedlings receiving only 2 yr of cutting (J). West. J. Appl. For. 15(3):154-162.
Can Selection Thinning Convert Even-Age Douglas-Fir Stands to Uneven-Age Structures?
Authors: Miller Mark , Emmingham Bill 
Published: August 2019

Abstract
Uneven-age management of Douglas-fir (Pseudotsuga menziesii) stands can be used to address aesthetic, wildlife habitat, biodiversity, and sustainability concerns, but there has been little long-term experience with this type of management. To develop timely information on converting even-age stands to uneven-age forests, we used retrospective stand reconstruction methods to document harvest frequency, intensity, and stand structural development at four sites in western Oregon. We studied stands managed by selection thinning and identified strategies for creating and managing uneven-age forests. Selection thinning benefited mid- and understory trees and stimulated natural regeneration. Although stand growth was less than expected from low thinning, growth per unit of growing stock was similar to that in unmanaged stands. Douglas-fir often dominated regeneration and had satisfactory vigor at stocking levels about half that considered full stocking for even-age management, but good growth of regeneration may require even lower overstory stocking. Shade-tolerant grand fir and western hemlock, however, were more abundant at higher stocking levels. Selection thinning of young Douglas-fir stands can sometimes be effective in promoting viable regeneration while providing regular income and biodiversity. Because this was a retrospective study only, further, long-term testing is necessary. West. J. Appl. For. 16(1):35–43.
Quantifying Stand Targets for Silvicultural Prevention of Crown Fires
Authors: Keyes Christopher R. , O'Hara Kevin L. 
Published: August 2019

Abstract
Forest managers are expressing a growing interest in proactively reducing susceptibility to crown fires, but the quantitative basis for defining specific stand targets and prescribing silvicultural regimes for this objective is lacking. A procedure is presented for creating resistant stand structures that exploits the relationship between crown fire development and characteristics of stand structure. The BEHAVE surface fire model was integrated with modified versions of the Van Wagner crown ignition and crown fire spread equations in order to quantify structural targets for mitigative silvicultural practices. The procedure tolerates an array of input data types for weather, site, and surface fuel variables so that hazard-reducing guidelines are tailored to specific site and stand conditions. Suggested strategies for achieving crown fire-resistant stand targets include pruning, low thinning, and surface fuel management. West. J. Appl. For. 17(2):101–109.
Views of Old Forestry and New Among Reference Groups in the Pacific Northwest
Authors: Ribe Robert G. , Matteson Mollie Y. 
Published: August 2019

Abstract
A public opinion survey was conducted in Washington and Oregon. It was not a representative poll sample but instead sampled groups of people favoring forest production, those favoring forest protection, and others not aligned with either of these viewpoints. There is strong consensus across groups regarding the unpopularity of established forestry methods and the need to regulate clearcutting. The weight of the sampled groups' opinions indicated that replanting and hiding clearcuts are not enough to make them acceptable, that New Forestry should not be practiced in old growth, and that foresters should attend more to wildlife. There was no clear weight of opinion that forest harvests be eliminated or clearcutting be banned. There was passionate distrust of foresters among many protectionists and nonaligned respondents, but most of the same people support New Forestry intentions. New Forestry offers a potentially more politically acceptable and stable basis for public forestry practice and policy. West. J. Appl. For. 17(4):173–182.
Stocking Control Procedures for Multiaged Lodgepole Pine Stands in the Northern Rocky Mountains
Authors: O'Hara Kevin L. , Kollenberg Cassandra L. 
Published: August 2019

Abstract
Patterns of leaf area distribution in multiaged lodgepole pine stands were used to develop a stocking control model. This model, the Lodgepole Pine–Multi-aged Stocking Control Model (LPP–MASAM), allows the user to design multiaged stand structures for implementation in lodgepole pine stands in the northern Rocky Mountains. The model is suitable for designing stands with two or three age classes, or two canopy strata. These multiaged stands represent a management alternative to even-aged stands where vigorous stands exist and windthrow is not a major constraint. The model requires the user to divide stands into components such as age classes or canopy strata that are the basic unit for growing space allocation. Growing space is represented by leaf area index. Stocking regimes are assessed over a single cutting cycle using projections of volume increment, stand density and tree vigor. Example stocking regimes are provided as are internet links to access the model. West. J. Appl. For. 18(1):15–21.
Marking Tree Seeds with Spray Paint for Germination Studies
Authors: Dumroese R. Kasten 
Published: August 2019

Abstract
I evaluated the potential use of spray paint for marking conifer seeds for germination studies in forest nurseries. For bulk seedlots of large-seeded species like western white pine (Pinus monticola), ponderosa pine (Pinus ponderosa), and Douglas-fir (Pseudotsuga menziesii), paint had little or no effect on six different germination parameters, but negatively affected germination of western larch (Larix occidentalis). On a family level with pine seeds, spray paint may or may not be appropriate depending on the specific objectives of the researcher and the level of conservatism used. West. J. Appl. For. 18(3):175–178.