Consumption of Sound and Decayed Ponderosa Pine and Douglas-Fir by Reticulitermes spp. (Isoptera: Rhinotermitidae) from Northern California

1998 ◽  
Vol 91 (3) ◽  
pp. 650-654 ◽  
Author(s):  
Gail M. Getty ◽  
Michael I. Haverty
Keyword(s):  
Ponderosa Pine ◽  
Douglas Fir ◽  
Northern California

scholarly journals Deterioration of Fire-Killed Timber in Southern Oregon and Northern California

1996 ◽  
Vol 11 (4) ◽  
pp. 125-131 ◽  
Author(s):  
Eini C. Lowell ◽  
James M. Cahill
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Douglas Fir ◽  
Northern California ◽  
Percent Loss ◽  
White Fir ◽  
Wide Range ◽  
Sugar Pine ◽  
Second Year ◽  
One Year

Abstract Deterioration of fire-killed timber in the coastal mountains of southern Oregon and northern California was monitored over a 3 yr period (1988-1990). Defect was identified and measured on felled and bucked sample trees by using Scribner and cubic scaling rules. Douglas-fir (Pseudotsuga menziesii), grand fir (Abies grandis), white fir (A. concolor),ponderosa pine (Pinus ponderosa), and sugar pine (Pinus lambertiana), covering a wide range of geographic areas, site conditions, and tree size and age, were studied. One year after death, Douglas-fir, sugar pine, and ponderosa pine had lost about 1% and the true firs 5% of their cubic volume. The sapwood of the pines was heavily stained. The occurrence of sap rot and weather checks increased the second year. Percent loss in all species was correlated with small-end scaling diameter. A logistic regression model predicting the incidence of cull was developed for use on logs that have been dead for 3 yr. West. J. Appl. For. 11(4):125-131.

scholarly journals Douglas-fir encroachment reduces drought resistance in Oregon white oak of northern California

2021 ◽  
Vol 498 ◽  
pp. 119543
Author(s):  
Jill J. Beckmann ◽  
Rosemary L. Sherriff ◽  
Lucy P. Kerhoulas ◽  
Jeffrey M. Kane
Keyword(s):  
Drought Resistance ◽  
Douglas Fir ◽  
Northern California ◽  
White Oak ◽  
Oregon White Oak

scholarly journals Douglas Fir and Ponderosa Pine Seed Dormancy as Regulated by Grassland Seedbed Conditions

2004 ◽  
Vol 57 (6) ◽  
pp. 661 ◽  
Author(s):  
Yuguang Bai ◽  
Don Thompson ◽  
Klaas Broersma
Keyword(s):  
Seed Dormancy ◽  
Ponderosa Pine ◽  
Douglas Fir

A field experiment informs expected patterns of conifer regeneration after disturbance under changing climate conditions

2015 ◽  
Vol 45 (11) ◽  
pp. 1607-1616 ◽  
Author(s):  
Monica T. Rother ◽  
Thomas T. Veblen ◽  
Luke G. Furman
Keyword(s):  
Field Experiment ◽  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Douglas Fir ◽  
Tree Regeneration ◽  
Colorado Front Range ◽  
Front Range ◽  
Average Growth ◽  
Growth And Survival ◽  
Treatment Type

Climate change may inhibit tree regeneration following disturbances such as wildfire, altering post-disturbance vegetation trajectories. We implemented a field experiment to examine the effects of manipulations of temperature and water on ponderosa pine (Pinus ponderosa Douglas ex P. Lawson & C. Lawson) and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings planted in a low-elevation, recently disturbed setting of the Colorado Front Range. We implemented four treatments: warmed only (Wm), watered only (Wt), warmed and watered (WmWt), and control (Co). We found that measures of growth and survival varied significantly by treatment type. Average growth and survival was highest in the Wt plots, followed by the Co, WmWt, and Wm plots, respectively. This general trend was observed for both conifer species, although average growth and survival was generally higher in ponderosa pine than in Douglas-fir. Our findings suggest that warming temperatures and associated drought are likely to inhibit post-disturbance regeneration of ponderosa pine and Douglas-fir in low-elevation forests of the Colorado Front Range and that future vegetation composition and structure may differ notably from historic patterns in some areas. Our findings are relevant to other forested ecosystems in which a warming climate may similarly inhibit regeneration by dominant tree species.

Genetically Improved Ponderosa Pine Seedlings Outgrow Nursery-Run Seedlings with and without Competition—Early Findings

1994 ◽  
Vol 9 (2) ◽  
pp. 57-61 ◽  
Author(s):  
Philip M. McDonald ◽  
Gary O. Fiddler ◽  
Jay H. Kitzmiller
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Northern California ◽  
Stem Height ◽  
Herbaceous Vegetation ◽  
Competing Vegetation ◽  
Growing Seasons ◽  
Pine Seedlings ◽  
Genetically Improved

Abstract Three classes of ponderosa pine (Pinus ponderosa) seedlings (nursery-run, wind-pollinated, control-pollinated) were evaluated for stem height and diameter at the USDA Forest Service's Placerville Nursery and the Georgetown Ranger District in northern California. Pines in all three classes were grown with competing vegetation or maintained in a free-to-grow condition. Control-pollinated seedlings were statistically taller (P < 0.05) than nursery-run counterparts when outplanted, and after 1 and 2 growing seasons in the field with and without competition. They also had significantly larger diameters when outplanted and after 2 growing seasons in the field when free to grow. Wind-pollinated seedlings grew taller than nursery-run seedlings when free to grow. A large amount of competing vegetation [bearclover (Chamaebatia foliolosa)—29,490 plants per acre; herbaceous vegetation—11,500; hardwood sprouts—233; and whiteleaf manzanita (Arctostaphylos viscida) seedlings—100] ensure that future pine development will be tested rigorously. West. J. Appl. For. 9(2):00-00.

scholarly journals Restoration Treatments Improve Overstory Tree Resistance Attributes and Growth in a Ponderosa Pine/Douglas-Fir Forest

Forests ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 574
Author(s):  
Justin S. Crotteau ◽  
Christopher R. Keyes
Keyword(s):  
Ponderosa Pine ◽  
Bark Beetles ◽  
Douglas Fir ◽  
Fuel Reduction ◽  
Surface Fire ◽  
Tree Resistance ◽  
Crown Length ◽  
Treatment Type ◽  
The Impact ◽  
Overstory Tree

Research Highlights: This study provides much needed insight into the development of resistance to disturbance and growth dynamics of overstory trees in response to restoration-based fuel reduction, and will be useful to scientists and managers attempting to better grasp the relative merits of restoration treatment types. Background and Objectives: Restoration-based fuel reduction treatments are common in dry, fire-prone forests of the western United States. The primary objective of such treatments is to immediately reduce a stand’s crown fire hazard. However, the impact of these treatments on residual trees is relevant to assess their longevity and resistance to future disturbances. In this study, we evaluate the effects of restoration on retained overstory ponderosa pine (Pinus ponderosa Lawson & C. Lawson) and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees in western Montana, where treatments were experimentally implemented 13 years prior as part of the national Fire and Fire Surrogate study. Materials and Methods: We examined tree attributes in response to the following replicated treatments: thin-only, burn-only, thin + burn, and a no-action control. We analyzed three different tree attributes that confer resistance to common disturbances: height-to-diameter ratio (resistance to wind), bark thickness (resistance to surface fire), and growth efficiency (resistance to bark beetles). Results: Our models suggest that thinning (with or without burning) alters tree attributes relative to the control in a manner that may increase tree resistance to wind and snow breakage, surface fire, and biotic agents such as bark beetles. Further analysis of annual growth of ponderosa pine and Douglas-fir varied by treatment type: thinning-based restoration (thin-only and thin + burn) increased diameter growth for both species, crown length and width in ponderosa pine, and crown length in Douglas-fir relative to unthinned treatments. Burning (burn-only and thin + burn) did not significantly affect tree growth relative to unburned treatments. Conclusions: While low-severity prescribed burning treatments are often used for restoration and have various ecosystem benefits, this study demonstrates that thinning (alone or in addition to burning) produces more measureable, beneficial results to overstory tree disturbance resistance metrics and growth.

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