Carbon-14 Ages of Douglas Fir Tree Rings From Vancouver Island

1966 ◽  
Author(s):  
W Dyck
Keyword(s):  
Tree Rings ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Carbon 14

scholarly journals Erratum: Corrigendum: Another rapid event in the carbon-14 content of tree rings

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Fusa Miyake ◽  
Kimiaki Masuda ◽  
Toshio Nakamura
Keyword(s):  
Tree Rings ◽  
Carbon 14

scholarly journals Radiocarbon Concentration in the Atmosphere: 8000-Year Record of Variations in Tree Rings: First Results of a USA Workshop

Radiocarbon ◽  
1980 ◽  
Vol 22 (3) ◽  
pp. 950-961 ◽  
Author(s):  
Jeffrey Klein ◽  
Juan Carlos Lerman ◽  
Paul E Damon ◽  
Timothy Linick
Keyword(s):  
Tree Rings ◽  
Half Life ◽  
Temporal Variations ◽  
Radiocarbon Dates ◽  
Calibration Scheme ◽  
Carbon 14 ◽  
Ongoing Process ◽  
De Vries ◽  
First Results ◽  
Historical Times

Radiocarbon dates calculated from the ratio of modern carbon-14 activity and sample activity and the half-life of carbon-14 need to be calibrated to compensate for temporal variations in the concentration of carbon-14 in the atmosphere. Development of a suitable calibration scheme has been an ongoing process of the last twenty years, ever since the discovery of variations in historical times of the atmospheric radiocarbon content which parallel climatic and solar phenomena (de Vries, 1958; 1959) and the recent depletion due to industrial effects (Suess, 1955).

A ROOT-ROT OF DOUGLAS FIR CAUSED BY PORIA WEIRII

1940 ◽  
Vol 18c (10) ◽  
pp. 522-533 ◽  
Author(s):  
Irene Mounce ◽  
J. E. Bier ◽  
Mildred K. Nobles
Keyword(s):  
Root Rot ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Thuja Plicata ◽  
Close Resemblance

A laminated root-rot of Douglas fir [Pseudotsuga taxifolia (Lamb.) Britt.] occurs in young stands on Vancouver Island, B.C. The decay, the sporophore associated with it, and the cultural characters of the fungus are described A comparison with Poria Weirii Murr., previously reported only on Thuja plicata (D Don.), shows a close resemblance in all respects between the two fungi.

scholarly journals Forest nutrition studies in Douglas-fir on Vancouver Island: A second report

1972 ◽  
Vol 48 (2) ◽  
pp. 88-91 ◽  
Author(s):  
D. L. Handley ◽  
L. V. Pienaar
Keyword(s):  
Vancouver Island ◽  
Douglas Fir ◽  
Forest Nutrition

not available

Ectomycorrhizae and growth of Douglas-fir seedlings preinoculated with Rhizopogonvinicolor and outplanted on eastern Vancouver Island

1993 ◽  
Vol 23 (8) ◽  
pp. 1711-1715 ◽  
Author(s):  
S.M. Berch ◽  
A.L. Roth
Keyword(s):  
Cold Storage ◽  
Growing Season ◽  
Vancouver Island ◽  
Douglas Fir ◽  
The Other ◽  
Field Soil ◽  
Field Season ◽  
Ectomycorrhizal Colonization ◽  
Growth Differences ◽  
And Control

Ectomycorrhizal colonization of container-grown Pseudotsugamenziesii (Mirb.) Franco (Douglas-fir) inoculated with Rhizopogonvinicolor A.H. Smith was determined after cold storage and after one growing season on a clearcut on eastern Vancouver Island. Inoculated Douglas-fir seedlings were taller than noninoculated controls when outplanted but, perhaps because of browse damage, no growth differences were found after one field season. Rhizopogonvinicolor colonized all of the inoculated but none of the control seedlings examined after cold storage. Volunteer Thelephoraterrestris Fr. colonized almost half of the control and 10% of the inoculated seedlings before outplanting. After one field season, inoculated and control seedlings were colonized by 15 ectomycorrhizal fungi each, only eight of which were found on both. Rhizopogonvinicolor persisted on the roots of inoculated plants, but was also present in the field soil since the control seedlings also bore these mycorrhizae after one growing season. The relative abundance of T. terrestris decreased from the nursery to the field. The other common ectomycorrhizae in the field included Myceliumradicisatrovirens Melin, Cenococcumgeophilum Fr., and types resembling Tuber and Endogone.

PREVENTION OF INSECT-CAUSED SEED LOSS IN DOUGLAS-FIR WITH SYSTEMIC INSECTICIDES

1966 ◽  
Vol 42 (1) ◽  
pp. 76-82 ◽  
Author(s):  
A. F. Hedlin
Keyword(s):  
Insect Pests ◽  
Gall Midge ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Systemic Insecticides ◽  
Seed Loss ◽  
Stage Of Development

Cone-bearing Douglas-fir trees in three localities on Vancouver Island were sprayed with the systemic insecticides Bidrin (0.35 and 0.75%), dimethoate, Sumithion, Meta-Systox-R, and SD 9129 (1.0 and 2.0%) when cones had reached the pendent stage of development. With the exception of Sumithion, all materials gave varying degrees of control over important insect pests of cones in this area, i.e. the gall midge, Contarinia oregonensis Foote, the cone moth, Barbara colfaxiana (Kft.), the seed chalcid, Megastigmus spermotrophus Wachtl, and the scale midge, C. washingtonensis Johnson.

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