Occurrence of vesicular-arbuscular mycorrhizae in Pseudotsuga menziesii and Tsuga heterophylla seedlings grown in Oregon Coast Range soils

Mycorrhiza ◽  
1995 ◽  
Vol 6 (1) ◽  
pp. 65-67 ◽  
Author(s):  
E. Cázares ◽  
J. E. Smith
Keyword(s):  
Pseudotsuga Menziesii ◽  
Arbuscular Mycorrhizae ◽  
Tsuga Heterophylla ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Vesicular Arbuscular Mycorrhizae ◽  
Vesicular Arbuscular

Correlations Between Overtopping Vegetation and Development of Douglas-Fir Saplings in the Oregon Coast Range

1987 ◽  
Vol 2 (4) ◽  
pp. 117-119 ◽  
Author(s):  
Samuel S. Chan ◽  
John D. Walstad
Keyword(s):  
Pseudotsuga Menziesii ◽  
Tree Height ◽  
Douglas Fir ◽  
Morphological Features ◽  
Diameter Growth ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Sapling Growth ◽  
Stem Diameter Growth

Abstract The response of Douglas-fir (Pseudotsuga menziesii) saplings to overtopping vegetation on three northeast-facing sites in the Oregon Coast Range was studied for two years. As amount of overtopping brush increased, sapling growth (as indicated by size) generally decreased. Basal stem diameter growth was most reduced, but similar reductions in growth occurred for tree height and other morphological features. West. J. Appl. For. 2(4):117-119, October 1987.

Ethanol in Douglas-fir with black-stain root disease (Leptographium wageneri)

1998 ◽  
Vol 28 (8) ◽  
pp. 1207-1212 ◽  
Author(s):  
Rick G Kelsey ◽  
Gladwin Joseph
Keyword(s):  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Root Disease ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Coos Bay ◽  
Root Collar

Diseased and healthy Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) were identified at two black-stain root disease centers, caused by Leptographium wageneri var. pseudotsugae Harrington & Cobb, in the Oregon Coast Range near Coos Bay. Phloem and sapwood near the root collar were sampled monthly for 1 year, whereas roots were sampled in October and November. Ethanol concentrations in sapwood of diseased trees near the root collar were 4-24 times higher than in healthy trees for all months of a year, except January and June. Roots from diseased trees in October had 5 times more ethanol in the phloem and 19 times more ethanol in the sapwood than corresponding tissue from healthy trees. Ethanol concentrations in roots from diseased trees in November were no different from October. Within trees, ethanol concentrations varied substantially among positions around the root collar and among different roots. Ethanol may play an important role in the biology of L.wageneri and beetle-pathogen interactions in Douglas-fir. Ethanol also may be useful in detecting stressed or diseased trees.

Overstory and understory development in thinned and underplanted Oregon Coast Range Douglas-fir stands

2006 ◽  
Vol 36 (10) ◽  
pp. 2696-2711 ◽  
Author(s):  
Samuel S Chan ◽  
David J Larson ◽  
Kathleen G Maas-Hebner ◽  
William H Emmingham ◽  
Stuart R Johnston ◽  
...  
Keyword(s):  
Tsuga Heterophylla ◽  
Douglas Fir ◽  
Coast Range ◽  
Old Growth ◽  
Shrub Species ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Crown Length ◽  
Accelerate Development ◽  
Understory Plant

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests managed for timber in western Oregon frequently lack structure and diversity associated with old-growth forests. We examined thinning effects on overstory and understory development for 8 years after treatment. Three 30- to 33-year-old Oregon Coast Range plantations were partitioned into four overstory treatments: unthinned (~550 trees/ha) and lightly (~250 trees/ha), moderately (~150 trees/ha), and heavily (~75 trees/ha) thinned. Within each overstory treatment, two understory treatments were established: underplanted with Douglas-fir and western hemlock (Tsuga heterophylla (Raf.) Sarg.) or not underplanted. Thinning increased overstory stem growth, crown expansion, and retained crown length. Thinned overstory canopies began to close rapidly the third year after thinning, decreasing % skylight by approximately 2%/year, whereas % skylight in unthinned stands increased slightly. All seedlings planted in unthinned stands died, whereas eighth year survival in thinned stands averaged 88%. Natural regeneration densities and distributions were highly variable. Understory shrub cover was reduced by harvesting disturbance but recovered by the fifth year. Thinning increased understory plant species diversity, and no shrub species were lost. Thinning to low densities and underplanting has the potential to accelerate development of multilayered stands characteristic of old-growth Douglas-fir forests.

Geologic map of the Tillamook Highlands, Northwest Oregon Coast Range

1994 ◽  
Author(s):  
R.E. Wells ◽  
P.D. Snavely ◽  
N.S. MacLeod ◽  
M.M. Kelly ◽  
M.J. Parker
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Geologic Map

FORMATION AND SEDIMENTATION OF LANDSLIDE-DAMMED LAKES WITHIN SMALL WATERSHEDS OF THE CENTRAL OREGON COAST RANGE

2017 ◽  
Author(s):  
Logan R. Wetherell ◽  
◽  
Lisa L. Ely ◽  
Megan Walsh ◽  
Joshua Roering ◽  
...  
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Small Watersheds

QUANTIFYING SEDIMENTATION PATTERNS OF SMALL LANDSLIDE-DAMMED LAKES IN THE CENTRAL OREGON COAST RANGE

2019 ◽  
Author(s):  
Logan R. Wetherell ◽  
◽  
Lisa L. Ely ◽  
Joshua Roering ◽  
Megan Walsh ◽  
...  
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast

Tholeiitic and alkalic basalts of the Eocene Siletz River Volcanics, Oregon Coast Range

1968 ◽  
Vol 266 (6) ◽  
pp. 454-481 ◽  
Author(s):  
P. D. Snavely ◽  
N. S. MacLeod ◽  
H. C. Wagner
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Alkalic Basalts
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