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Tsuga heterophylla

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Journal Article
Journal: Geology
Published: 01 January 2005
Geology (2005) 33 (1): 33-36.
...Lenny Kouwenberg; Rike Wagner; Wolfram Kürschner; Henk Visscher AbstractA stomatal frequency record based on buried Tsuga heterophylla needles reveals significant centennial-scale atmospheric CO2 fluctuations during the last millennium. The record includes four CO2 minima of 260–275 ppmv (ca. A.D...
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Image
Figure 1. Response of stomatal parameters of  <b>Tsuga</b> <b>heterophylla</b>  to  p CO ...
in > Geology
Published: 01 January 2005
Figure 1. Response of stomatal parameters of Tsuga heterophylla to p CO 2 increase from 24 to 38 Pa. CO 2 partial pressure was calculated as CO 2 mixing ratio (in parts per million by volume) times barometric air pressure P B (Pa). Barometric air pressure was estimated according to Jones
Journal Article
Published: 07 January 2016
Canadian Journal of Earth Sciences (2016) 53 (3): 304-320.
... mertensiana pollen at Lynn and Seymour valleys and Port Moody characterize most of the Olympia Interstade during local peat deposition in Cyperaceae and Myrica wetlands until about 26.7 14C ka BP under a cool and moist climate. A brief Pinus– Tsuga heterophylla zone at Lynn Valley 44–39 14C ka BP suggests...
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Journal Article
Published: 18 June 2007
Canadian Journal of Earth Sciences (2007) 44 (5): 707-719.
... and increased fire frequency in the southernmost Coast Mountains. About 1300 14C years BP, the forest became more coastal in composition with abundant Tsuga heterophylla and Abies. An increase in Tsuga mertensiana pollen suggests the onset of cool and wet conditions by ca. 500 14C years BP, coincident...
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Journal Article
Journal: Palynology
Published: 01 October 1995
Palynology (1995) 19 (1): 95-117.
...); Arceuthobium, Abies, Picea, Pinus, Pseudotsuga, Sequoiadendron, Tsuga heterophylla, and T. mertensiana reach maxima in cool moist climate (10-15 degrees C, 500-2000 mm); and Cyperaceae, Umbelliferae, and Salix reach maxima in cold wet climate (<5 degrees C and >2000 mm). The frequency distribution...
Journal Article
Published: 01 September 1989
Canadian Journal of Earth Sciences (1989) 26 (9): 1811-1825.
...-Mazama (ca. 6600–6800 years ago) interval, when the vegetation was more open and herb rich and the lake levels were lower than at present. Wetter climatic conditions appear in post-Mazama time, indicated by regional increases in the pollen of Tsuga heterophylla and other coastal and subalpine trees...
Journal Article
Published: 01 August 1986
Canadian Journal of Earth Sciences (1986) 23 (8): 1156-1168.
... years old, is dominated by arboreal pollen, mainly Picea. MC 2 (approximately 34 000 years old) is dominated by Picea in conjunction with significant amounts of Tsuga heterophylla. Paleoclimatic implications of the assemblages are that temperatures 42 000 years ago were approximately 3 °C cooler than...
Journal Article
Published: 01 August 1983
Canadian Journal of Earth Sciences (1983) 20 (8): 1232-1247.
... provenance and paleocurrent data indicate that stream flow during the last interglacial issued from nearby mountains and onto coastal floodplains that shelved into the ancestral Strait of Georgia and Juan de Fuca Strait. Abundant Pseudotsuga and Tsuga heterophylla pollen indicate that climate during...
Journal Article
Published: 01 May 1983
Canadian Journal of Earth Sciences (1983) 20 (5): 873-885.
...Linda E. Heusser AbstractVarved, black clayey silts deposited in the marine waters of Saanich Inlet yield unusually abundant and diverse pollen assemblages derived from the coastal Douglas-fir (Pseudotsuga) and western hemlock (Tsuga heterophylla) forests of southwestern British Columbia. The 12...
Journal Article
Published: 01 May 1975
Canadian Journal of Earth Sciences (1975) 12 (5): 745-756.
... and Douglas-fir, and increasing cedar (Thuja-Chamaecyparis type), western hemlock (Tsuga heterophylla), fir (Abies) and birch; an assemblage indicating a return to wetter conditions. This sequence contrasts with previously described successions that recognized the classical Hypsithermal in adjacent areas...
Journal Article
Published: 23 July 2010
Canadian Journal of Earth Sciences (2010) 47 (7): 971-985.
... mertensiana). In some valley bottom alluvial settings, black cottonwood (Populus trichocarpa) forms locally significant stands. In Prince William Sound to the east, a more diverse coastal forest of Sitka spruce, mountain hemlock, with western hemlock in some areas (Tsuga heterophylla), and rare stands...
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Figure 3. Reconstructed CO 2  mixing ratios based on stomatal frequency cou...
in > Geology
Published: 01 January 2005
Figure 3. Reconstructed CO 2 mixing ratios based on stomatal frequency counts on Tsuga heterophylla needles for A.D. 800–2000. Black line connects means of 3–5 needles per sample; thick white line shows three-point moving average. Gray area indicates confidence interval of ±1 root mean standard
Image
Figure 2. Benthic δ 18 O, CaCO 3 , C org , and representative pollen specie...
in > Geology
Published: 01 December 2001
. (1984) for >400 ka. Pollen associated with strong interglacials, e.g., Sequoia , are prominent for only ∼10% of record. Pollen of cold-climate vegetation, e.g., Artemisia spp., are associated with coldest SSTs. Intermediate conditions cause a third group, e.g., Tsuga heterophylla
Image
Figure 4. Comparison between reconstructed CO 2  mixing ratios and Northern...
in > Geology
Published: 01 January 2005
Figure 4. Comparison between reconstructed CO 2 mixing ratios and Northern Hemisphere climate records. A: CO 2 mixing ratios from stomatal counts on Tsuga heterophylla needles from Jay Bath. Thin dashed line connects means of 3–5 needles per sample depth, thick line three-point moving average
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Figure 4. Stratigraphic distribution of regionally extinct and unusual poll...
Published: 01 June 2001
Figure 4. Stratigraphic distribution of regionally extinct and unusual pollen types. One species of Zamiaceae, Zamia integrifolia , is extant in Florida today. Tsuga canadensis –type includes T . canadensis and T . caroliniana , which occur in the Appalachians and northeastern North
Journal Article
Journal: Geology
Published: 01 December 2001
Geology (2001) 29 (12): 1115-1118.
.... (1984) for >400 ka. Pollen associated with strong interglacials, e.g., Sequoia , are prominent for only ∼10% of record. Pollen of cold-climate vegetation, e.g., Artemisia spp., are associated with coldest SSTs. Intermediate conditions cause a third group, e.g., Tsuga heterophylla...
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Journal Article
Published: 01 June 2012
Bulletin of the Seismological Society of America (2012) 102 (3): 1079-1098.
... 1240–1390 Limiting minimum for unit A and B Tsuga heterophylla cone in 2 cm above sand units Wetland; 47.52655, −122.69600 BETA 263042 1390 ± 40 570–690 Limiting maximum for unit B Charcoal in 5 cm below unit B Otto Jarstad Park; 47.530485, −122.708573 BETA 263043 1100 ± 25 890–990...
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Journal Article
Published: 13 January 2015
Bulletin of the Seismological Society of America (2015) 105 (1): 38-71.
... plicata Donn ex D. Don Tsuga heterophylla (Raf.) Sarg. Vaccinium L. Veratrum viride Common lady fern Deer fern Purple marshlocks American skunk cabbage False lily of the valley Indian plum Licorice fern Western red cedar Western hemlock Blueberry Green false hellebore Upland closed‐canopy forest...
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Series: Geological Society, London, Special Publications
Published: 01 January 2005
DOI: 10.1144/GSL.SP.2005.251.01.03
EISBN: 9781862394995
... been logged to varying degrees. Tree species present on the study fans were Picea sitchensis, Picea glauca, Picea engelmannii, Picea glauca x engelmannii, Thuja plicata, Abies lasciocarpa, Abies amabilis, Tsuga heterophylla, Pinus contorta var. latifolia, Pinus albicaulis, Alnus rubra, Alnus incana...
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Journal Article
Journal: Palynology
Published: 03 April 2018
Palynology (2018) 42 (2): 168-179.
..., which is often dispersed close to the ground and may not have been recycled into the caves located at higher elevations. © 2017 AASP – The Palynological Society 2017 AASP – The Palynological Society In both the sediment and surface samples there were only sporadic occurrences of Tsuga heterophylla...