scholarly journals Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas fir (Pseudotsuga menziesii(Mirb.) Franco)

2006 ◽  
Vol 63 (7) ◽  
pp. 699-706 ◽  
Author(s):  
Cyrille B. K. Rathgeber ◽  
Valérie Decoux ◽  
Jean-Michel Leban
Keyword(s):  
Tree Ring ◽  
Wood Density ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Anatomical Characteristics

scholarly journals Dynamics of cavitation in a Douglas-fir tree-ring: transition-wood, the lord of the ring?

2014 ◽  
Vol 1 ◽  
pp. e005 ◽  
Author(s):  
Guillermina Dalla-Salda ◽  
María Elena Fernández ◽  
Anne-Sophie Sergent ◽  
Philippe Rozenberg ◽  
Eric Badel ◽  
...  
Keyword(s):  
Water Stress ◽  
Tree Ring ◽  
Wood Density ◽  
Douglas Fir ◽  
X Ray ◽  
Conductive Surface ◽  
Lower Transition ◽  
Successive Initiation ◽  
Old Trees ◽  
Transition Wood

The objective of this work was to investigate the dynamics of embolism formation within a Douglas-fir tree-ring. Four resistant and four vulnerable 10-year-old trees were selected among 50 trees, based on their P50. Stem samples, taken next to those used to obtain the vulnerability to cavitation curves, were collected and submitted to increasing positive pressures, in order to simulate increasing tension caused by water stress in the xylem. Then the conductive surface of the samples was stained and scanned and the images were analyzed. X-ray microdensity profiles were obtained on the same samples. The microdensity profiles of the 2011 ring were analyzed in three parts, earlywood, transition-wood and latewood. The dynamics of embolism propagation was observed separately in these three parts. Our results showed that the initiation and the propagation of the cavitation follow a discrete trend, with at least two successive initiation events: first cavitation initiates and propagates rapidly in the latewood. Then, a second cavitation event begins and spreads in the earlywood and eventually propagates to the transition-wood, which remains the last conductive part in the ring before full embolism. We observed that resistant to cavitation trees showed lower transition-wood density than vulnerable to cavitation trees. 

scholarly journals Genetic control of the tree-ring response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to the 2003 drought and heat-wave in France

2008 ◽  
Vol 65 (1) ◽  
pp. 102-102 ◽  
Author(s):  
Alejandro G. Martinez Meier ◽  
Leopoldo Sanchez ◽  
Guillermina Salda ◽  
Mario J. M. Pastorino ◽  
Jean-Yves Gautry ◽  
...  
Keyword(s):  
Genetic Control ◽  
Heat Wave ◽  
Tree Ring ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir

The Curious Douglas-Fir (Pseudotsuga Menziesii) Trees in Schulman Grove, Mesa Verde National Park, Southwestern Colorado, USA

2021 ◽  
pp. 1-20
Author(s):  
Stephen E. Nash ◽  
Ronald H. Towner ◽  
Jeffrey S. Dean
Keyword(s):  
Forest Management ◽  
Tree Ring ◽  
Pseudotsuga Menziesii ◽  
National Park ◽  
Douglas Fir ◽  
The West ◽  
West Side ◽  
Mesa Verde ◽  
Ancestral Puebloan ◽  
Tree Manipulation

In 1954, archaeologists James Allen Lancaster and Don Watson and dendrochronologist Edmund Schulman asserted that a small grove of Douglas-fir (Pseudotsuga menziesii [Mirbel] Franco var. glauca [Beissener] Franco) trees in Navajo Canyon on the west side of Chapin Mesa in Mesa Verde National Park contained evidence of stone-axe-cut tree limbs. In 1965, archaeologists Robert Nichols and David Smith published an article entitled “Evidence of Prehistoric Cultivation of Douglas-Fir Trees at Mesa Verde,” in which they supported the Lancaster/Watson/Schulman assertion with tree-ring dates from suspected stone-axe-cut limbs. If correct, Nichols and Smith (1965) document the only trees in the entire U.S. Southwest that contain ancient stone-axe-cut stubs and evidence of precolumbian forest management. Rather than accept their interpretations at face value, we attempt to replicate their dates through the (re)analysis of archived and recently collected tree-ring samples, and through a controlled analysis and comparison of archived and published records. We could not confirm their results, and we have no option but to reject their claim that Schulman Grove contains evidence of precolumbian tree manipulation by Ancestral Puebloan inhabitants of Mesa Verde.

scholarly journals Wood density proxies of adaptive traits linked with resistance to drought in Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)

Trees ◽  
2014 ◽  
Vol 28 (5) ◽  
pp. 1289-1304 ◽  
Author(s):  
Manuela Ruiz Diaz Britez ◽  
Anne-Sophie Sergent ◽  
Alejandro Martinez Meier ◽  
Nathalie Bréda ◽  
Philippe Rozenberg
Keyword(s):  
Wood Density ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Adaptive Traits

New Tree-Ring Dates for Recent Eruptions of Mount St. Helens

1983 ◽  
Vol 20 (2) ◽  
pp. 246-250 ◽  
Author(s):  
David K. Yamaguchi
Keyword(s):  
Tree Ring ◽  
Pseudotsuga Menziesii ◽  
Tree Growth ◽  
Douglas Fir ◽  
Growth Patterns ◽  
Tephra Layer ◽  
Growth Rings ◽  
Old Growth ◽  
Mount St Helens

Distinctive patterns of growth rings in increment cores from old-growth Douglas-fir (Pseudotsuga menziesii) stands identify A.D. 1800 as a more precise date for the eruption of tephra layer T by Mount St. Helens, Washington. Layer T was previously inferred to date to about A.D. 1802. Growth patterns also establish A.D. 1480 as the date of eruption of the earlier layer Wn, previously estimated as dating to about A.D. 1500. The timing of radial tree growth places a small limitation on the seasonal resolution of these new tree-ring dates.

scholarly journals Analyse rétrospective de l'adaptation à la sécheresse chez le douglas

2012 ◽  
Vol 163 (3) ◽  
pp. 88-95 ◽  
Author(s):  
Philippe Rozenberg ◽  
Anne-Sophie Sergent ◽  
Guillermina Dalla-Salda ◽  
Alejandro Martinez-Meier ◽  
Sara Marin ◽  
...  
Keyword(s):  
Retrospective Analysis ◽  
Water Deficit ◽  
Wood Density ◽  
Pseudotsuga Menziesii ◽  
Hydraulic Properties ◽  
Douglas Fir ◽  
Ecological Preferences ◽  
Significant Relationships ◽  
Dry Conditions ◽  
The Relationship

Retrospective analysis of the adaptation of the Douglas-fir to drought For a number of years in certain regions of France the Douglas-fir trees (Pseudotsuga menziesii [Mirb.] Franco) have presented symptoms of withering which have been attributed to drought. Our results show that the hydraulic function of the wood plays a part in the resistance of the Douglas-fir to dry conditions. Narrower cellular conduits, and therefore a greater wood density, contribute to the survival of trees confronted with a period of a marked water deficit. This idea is confirmed by the existence of significant relationships between wood density and hydraulic properties of wood in which the raw sap circulates, and also by the relationships found between the ecological preferences of specimens in their area of origin and the density of their wood in regions of France where they have been introduced. Those coming from dry regions have a tendency to develop wood with characteristics similar to that of trees which have survived drought. While the relationship between wood density and survival has been demonstrated, the differences in the nature of this relationship between different sites show that the mechanisms involved are complex and to a large extent still not understood.

scholarly journals Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Plant Disease ◽  
2013 ◽  
Vol 97 (6) ◽  
pp. 744-748 ◽  
Author(s):  
Jerry E. Weiland ◽  
Bryan R. Beck ◽  
Anne Davis
Keyword(s):  
Pseudotsuga Menziesii ◽  
Seedling Survival ◽  
The United States ◽  
Douglas Fir ◽  
Tree Seedlings ◽  
Pythium Species ◽  
Forest Nursery ◽  
Damping Off ◽  
Greenhouse Study ◽  
Forest Nurseries

Pythium species are common soilborne oomycetes that occur in forest nursery soils throughout the United States. Numerous species have been described from nursery soils. However, with the exception of P. aphanidermatum, P. irregulare, P. sylvaticum, and P. ultimum, little is known about the potential for other Pythium species found in nursery soils to cause damping-off of tree seedlings. A greenhouse study was conducted to evaluate the pathogenicity and virulence of 44 Pythium isolates representing 16 species that were originally recovered from soil at three forest nurseries in Washington and Oregon. Seeds of Douglas-fir (Pseudotsuga menziesii) were planted into soil infested with each of the isolates. Seedling survival, the number of surviving seedlings with necrotic root lesions, and taproot length were evaluated 4 weeks later. Responses of Douglas-fir to inoculation varied significantly depending on Pythium species and isolate. Eight species (P. dissotocum, P. irregulare, P. aff. macrosporum, P. mamillatum, P. aff. oopapillum, P. rostratifingens, P. sylvaticum, and P. ultimum var. ultimum) significantly reduced the number of surviving seedlings compared to the noninoculated treatment. However, all Pythium species caused a greater percentage of seedlings to develop root lesions (total mean 40%) than was observed from noninoculated seedlings (17%). Taproot length varied little among Pythium treatments and was not a useful character for evaluating pathogenicity. Results confirm the ability of P. irregulare, P. mamillatum, and P. ultimum var. ultimum to cause damping-off of Douglas-fir seedlings, and are indicative that other species such as P. dissotocum, P. aff. macrosporum, P. aff. oopapillum, P. rostratifingens, and P. sylvaticum may also be responsible for seedling loss.

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