Suppressed crown expansion and increased bud density after precommercial thinning in California Douglas-fir

1983 ◽  
Vol 13 (6) ◽  
pp. 1246-1248 ◽  
Author(s):  
Douglas A. Maguire
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Precommercial Thinning

A densely regenerated Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) plantation in northern California was precommercially thinned from approximately 15 000 stems/ha to 740 stems/ha. Trees in an unthinned strip served as control for analyzing thinning responses. The terminal and lateral leader growth of "released" trees were significantly reduced after thinning, but the number of buds was significantly increased.

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

Trunk-Implanted Acephate to Protect Douglas-Fir Seed Crops on Individual Trees in Northern California

1988 ◽  
Vol 81 (6) ◽  
pp. 1668-1671 ◽  
Author(s):  
John D. Stein ◽  
Thomas W. Koerber ◽  
Charles L. Frank
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Seed Crops ◽  
Individual Trees

TIMEMA DOUGLASI (PHASMATOPTERA: TIMEMATODEA), ANEW PARTHENOGENETIC SPECIES FROM SOUTHWESTERN OREGON AND NORTHERN CALIFORNIA, WITH NOTES ON OTHER SPECIES

1996 ◽  
Vol 128 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Cristina P. Sandoval ◽  
Vernon R. Vickery
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Old Growth ◽  
Parthenogenetic Species ◽  
The Third

AbstractTimema douglasi sp.nov. is described from southwestern Oregon and northern California, USA. It is the third parthenogenetic species in the genus and is a specialist feeder on old-growth Douglas fir, occasionally causing serious defoliation. Timema knulli Strohecker is synonymized with Timema californicum Scudder.

Rhabdocline parkeri, a ubiquitous foliar endophyte of Douglas-fir

1986 ◽  
Vol 64 (9) ◽  
pp. 1849-1855 ◽  
Author(s):  
Martha Sherwood-Pike ◽  
Jeffrey K. Stone ◽  
George C. Carroll
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Extensive Survey

Rhabdocline parkeri n. sp. (Hemiphacideaceae) is described, together with its sporodochial anamorph, Meria parkeri n. sp. Rhabdocline parkeri occurs as localized endophytic infections of living Douglas-fir needles, fruiting primarily on senescent, galled, or dead needles. It is ubiquitous in western Oregon, occurring on essentially all trees sampled in an extensive survey of Douglas-fir needle endophytes, and has been recorded from Washington and northern California.

Effect of precommercial thinning followed by a fertilization regime on branch diameter in coastal United States Douglas-fir plantations

2008 ◽  
Vol 38 (6) ◽  
pp. 1564-1575 ◽  
Author(s):  
David G. Briggs ◽  
Rapeepan Kantavichai ◽  
Eric C. Turnblom
Keyword(s):  
Remote Sensing ◽  
Growth Models ◽  
Important Variable ◽  
Douglas Fir ◽  
Precommercial Thinning ◽  
Breast Height ◽  
Remote Sensing Technology ◽  
Sensing Technology ◽  
The Mean ◽  
Pseudostuga Menziesii

The effect of precommercial thinning in 6- to 13-year-old Douglas-fir ( Pseudostuga menziesii (Mirb.) Franco var. menziesii ) plantations with and without fertilization with 224 kg·ha–1 nitrogen (N) as urea on the mean diameter of the largest limb at breast height (DLLBH) was modeled. DLLBH is a simple, nondestructive field measurement related to log knot indices used to measure log quality in product recovery studies. Model [1] succeeded in predicting mean DLLBH (RMSE = 2.80 and radj2 = 0.84) using only site, initial stocking, and treatment variables. Model [2], which used only mean tree variables, improved on model [1] and was simpler. However, model [3], which used a combination of both groups of variables, produced the best model. Model [4] successfully predicted mean DLLBH using variables that can be measured with light detection and ranging (LIDAR), a high-resolution remote sensing technology. Since the age when the live crown receded above breast height is an important variable in some of the models, model [5] was developed to predict when crown recession above breast height occurs. This study found that mean DLLBH of Douglas-fir plantations can be estimated using variables obtained from stand-level growth models or remote sensing, providing a quality indicator that can be easily measured and verified in the field.

Restoration thinning enhances growth and diversity in mixed redwood/Douglas-fir stands in northern California, U.S.A.

2018 ◽  
Vol 26 (6) ◽  
pp. 1170-1179 ◽  
Author(s):  
Christa M. Dagley ◽  
John-Pascal Berrill ◽  
Lathrop P. Leonard ◽  
Yoon G. Kim
Keyword(s):  
Douglas Fir ◽  
Northern California

A Generalized Height-Diameter Equation for Coastal California Species

1988 ◽  
Vol 3 (4) ◽  
pp. 113-115 ◽  
Author(s):  
Bruce E. Krumland ◽  
Lee C. Wensel
Keyword(s):  
Pseudotsuga Menziesii ◽  
Site Index ◽  
Douglas Fir ◽  
Sequoia Sempervirens ◽  
Small Samples ◽  
Diameter Distribution ◽  
Northern California ◽  
Local Volume ◽  
Total Height ◽  
Volume Table

Abstract The equation H = Hm exp [-b(D-c - Dm-c)] is proposed for estimating the total height of trees on growth and inventory plots. This estimator requires only the computation of average dbh (Dm) and average total height (Hm) of a sample of trees selected from the upper one-fifth of the stand diameter distribution. The procedure is also efficient because this stand component is also used to estimate site index. With small samples, these equations were found to be accurate in local volume table construction. Results are illustrated using redwood (Sequoia sempervirens) and Douglas-fir (Pseudotsuga menziesii) data from northern California. West. J. Appl. For. 3(4):113-115, October 1988.

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