A MAPPING, PETROGRAPHY, AND GEOCHEMISTRY-BASED STUDY OF VOLCANIC UNITS IN THE SOUTHERN OREGON CASCADES

The article aims to evaluate the research provenance plot established in 1980 in locality No. 214 – Hrubá Skála (in the north of the Czech Republic), where nine provenances of grand fir (Abies grandis (Douglas ex D. Don) Lindley) provided in the framework of the International Union of Forest Research Organizations project, and one provenance of grand fir, Norway spruce, silver fir and Douglas-fir from a standard commercial source are tested. We present the results of tree height, stem DBH, stem volume production and health status after 36 years. The results correspond with similar experiments in the Czech Republic and abroad and suggest that grand fir provenances from Vancouver Island (British Columbia, Canada) and the Washington (USA) State coastal region show the best production features, while the Oregon Cascades, Idaho and Montana provenances grow more slowly. Comparison with other tree species indicates that the production of grand fir at the investigated age exceeds the production of both Norway spruce and silver fir, and equalizes or gently exceeds even Douglas-fir.

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Cloud-Seeding Analysis in Oregon *

Bulletin of the American Meteorological Society ◽

10.1175/1520-0477-34.7.298 ◽

1953 ◽

Vol 34 (7) ◽

pp. 298-303 ◽

Cited By ~ 1

Author(s):

R. T. Beaumont

Keyword(s):

Regression Method ◽

The Other ◽

Supporting Evidence ◽

Cloud Seeding ◽

Other Hand ◽

Oregon Cascades

Two separate evaluations of commercial cloud-seeding operations in Oregon are discussed using the regression method with non-seeded control areas. No supporting evidence that cloud-seeding materially increased precipitation is found. On the other hand, strongest evidence found in these analyses of possible precipitation modification which could be attributed to cloud-seeding is a decrease of snowfall for two winters in the Southern Oregon Cascades.

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Response of aboveground biomass increment, growth efficiency, and foliar nutrients to thinning, fertilization, and pruning in young Douglas-fir plantations in the central Oregon Cascades

Canadian Journal of Forest Research ◽

10.1139/x92-170 ◽

1992 ◽

Vol 22 (9) ◽

pp. 1278-1289 ◽

Cited By ~ 37

Author(s):

Alejandro Velazquez-Martinez ◽

David A. Perry ◽

Tom E. Bell

Keyword(s):

Leaf Area ◽

Aboveground Biomass ◽

Cultural Practices ◽

Growth Efficiency ◽

Douglas Fir ◽

Nitrogen And Phosphorus ◽

Area Index ◽

Biomass Increment ◽

Oregon Cascades

The effect of thinning and cultural practices (multinutrient fertilization, pruning) on total aboveground biomass increment and growth efficiency was studied over three consecutive 2-year periods (1981–1987) in young Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) plantations. Net aboveground biomass increment over the 6-year period averaged 14.5, 7.8, and 5.5 Mg•ha−1•year−1 for the high-, medium-, and low-density plots, respectively. Growth efficiency, after dropping sharply between leaf area indexes of 1 and 6 m2/m2, remained relatively constant up to a leaf area index of 17, the highest measured. Consequently, aboveground biomass increment continued to increase at leaf area indexes well above that at which the Beer–Lambert law predicts maximum light should be absorbed. Foliage analyses indicate that thinning improved nitrogen, potassium, and magnesium nutrition and increased the translocation of potassium from 1-year-old foliage to support new growth. However, fertilization increased foliar nitrogen and phosphorus contents only when coupled with pruning, suggesting that trees favor total leaf area over individual needle nutrition. Indications of potassium and magnesium limitations in this study are supported by other recent studies in Douglas-fir. Further work on the role of multinutrient deficiencies in this species is warranted.

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Early Realized Genetic Gains for Coastal Douglas-Fir in the Northern Oregon Cascades

Western Journal of Applied Forestry ◽

10.1093/wjaf/19.3.195 ◽

2004 ◽

Vol 19 (3) ◽

pp. 195-201 ◽

Cited By ~ 12

Author(s):

J. Bradley St. Clair ◽

Nancy L. Mandel ◽

Keith J. S. Jayawickrama

Keyword(s):

Douglas Fir ◽

Stem Volume ◽

Early Assessment ◽

Improvement Program ◽

Genetic Gains ◽

Large Numbers ◽

Genetically Improved ◽

Progeny Tests ◽

Realized Genetic Gains ◽

Oregon Cascades

Abstract Block-plot realized genetic gain trials were established for coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) at five sites in the northern Oregon Cascades. The long-term objectives of these trials are to explore the growth trajectories and productivity of genetically improved stands and their relationship to predicted genetic gains based on performance in progeny tests. Measurements 5 years after planting provide an opportunity for an early assessment of realized genetic gains as compared to predicted gains and provide data for determining the number of replicates needed to detect statistically significant differences between improved and unimproved populations using large block plots. Results indicate that progress from selection and breeding of Douglas-fir is readily achievable, and realized genetic gains 5 years after planting are similar to those predicted based on results from progeny tests. Realized genetic gains were about 6% for height, 8% for diameter, and 28% for stem volume, compared to predicted genetic gains of about 8% for height, 7% for diameter, and 25% for stem volume. Large numbers of replicates (30–50) are required to detect statistically significant differences in height and diameter between improved and unimproved populations given genetic gains expected in a typical tree improvement program. West. J. Appl. For. 19(3):195–201.

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The 13–14 December 2001 IMPROVE-2 Event. Part II: Comparisons of MM5 Model Simulations of Clouds and Precipitation with Observations

Journal of the Atmospheric Sciences ◽

10.1175/jas3551.1 ◽

2005 ◽

Vol 62 (10) ◽

pp. 3520-3534 ◽

Cited By ~ 53

Author(s):

Matthew F. Garvert ◽

Christopher P. Woods ◽

Brian A. Colle ◽

Clifford F. Mass ◽

Peter V. Hobbs ◽

...

Keyword(s):

Liquid Water ◽

Mesoscale Model ◽

Heavy Precipitation ◽

Precipitation Event ◽

State University ◽

Cloud Liquid Water ◽

Aircraft Flight ◽

Oregon Cascades ◽

Microphysical Parameterization ◽

Mass Concentrations

Abstract This paper compares airborne in situ observations of cloud microphysical parameters with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) simulations, using the Reisner-2 bulk microphysical parameterization, for a heavy precipitation event over the Oregon Cascades on 13–14 December 2001. The MM5 correctly replicated the extent of the snow field and the growth of snow particles by vapor deposition measured along aircraft flight tracks between altitudes of 4.9 and 6 km, but overpredicted the mass concentrations of snow. The model produced a broader number distribution of snow particles than observed, overpredicting the number of moderate-to-large-sized snow particles and underpredicting the number of small particles observed along the aircraft flight track. Over the mountain crest, the model overpredicted depositional growth of snow and mass concentrations of snow, but underpredicted the amount of cloud liquid water and conversion of snow to graupel. The misclassification of graupel as snow and excessive amounts of snow resulted in the model overpredicting precipitation on the lee slopes and in localized areas along the foothills of the Cascades. The model overpredicted cloud liquid water over the lower windward slopes and foothills, where accretion of cloud liquid water by rain was the primary precipitation-producing mechanism.

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