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Displaying entries 21 - 40 of 128 in total

AVA-AK: North Slope ARCSS/LAII Flux Study (Walker 1995-1996 unpublished data)

Aava nsflux dwalker 1995 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: North Slope ARCSS/LAII Flux Study. The vegetation and soils at the North Slope Arctic System Science/Land-Atmosphere-Ice Interactions ARCSS/LAII Flux tower sites of F. S. Chapin and W. Oechel on the North Slope of Alaska were described by D. A. Walker, J. Bockheim, and C. L. Ping in 1995 and 1996. The primary source documents for this dataset are a...
Complete
1995-08-15
1996-08-18
2019-09-30 13:46:08 -0800
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AVA-AK: Oumalik Vegetation Plots (Ebersole 1985)

Aava oumalik jebersole 1985 a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Oumalik Vegetation Plots. The vegetation in the vicinity of Oumalik Oil Well Number 1 was described and mapped by J. Ebersole for his doctoral thesis at the University of Colorado, Department of Environmental, Population and Organismic Biology (Ebersole 1985). Funding for the research came primarily from the Cold Climate Research Laboratory based on...
Complete
1979-06-20
1981-08-04
2019-09-30 13:47:24 -0800
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AVA-AK: Pingo Vegetation Plots (M. Walker 1990)

Aava pingos mwalker 1990 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Pingo Vegetation Plots. The vegetation and floristics of pingos on the Central Arctic Coastal Plain of Alaska were described by M. D. Walker for her doctoral thesis at the University of Colorado, Department of Environmental, Population and Organismic Biology (Walker 1990). Funding was provided by National Science Foundation grants DPP-8312497 and...
Complete
1983-07-29
1986-07-28
2019-09-30 13:48:42 -0800
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AVA-AK: Poplar Vegetation Plots (Breen 2014)

Aava poplars abreen 2014 a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Poplar Vegetation plots. The vegetation associated with balsam poplar stands in the Arctic Foothills of Alaska and the interior boreal forests of Alaska and Yukon was described by Breen (2014) as part of her doctoral dissertation research from 2003 to 2006 (Breen 2010). This research was supported by a National Science Foundation Doctoral Dissertation...
Complete
2003-06-18
2005-08-17
2019-09-30 13:42:21 -0800
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AVA-AK: Prudhoe Bay-ArcSEES Road Study (Walker et al. 2015)

Aava pruarc dwalker 2015 apicture Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Prudhoe Bay-ArcSEES Road Study. Sampling of vegetation in the vicinity of Lake Colleen off the Spine Road at Prudhoe Bay was undertaken in 2014 as part of a study that focused on thermokarst in relationship to climate change and oilfield infrastructure. The objectives of the project were to study the effects of road dust and road-related flooding to...
Complete
2014-06-01
2015-03-31
2019-09-30 13:51:08 -0800
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AVA-AK: Prudhoe Bay Vegetation Plots (Walker 1985)

Aava prudhoebay dwalker 1985 a site photo Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Prudhoe Bay Vegetation Plots. The vegetation of the Prudhoe Bay area was described and mapped by D. A. Walker for doctoral thesis at the University of Colorado, Department of Environmental, Population and Organismic Biology (Walker 1981). The study was initiated in 1973 under the U.S. Tundra Biome portion of the International Biological Program (IBP) and...
Complete
1974-01-06
1975-01-09
2019-09-30 13:58:38 -0800
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AVA-AK: Selawik National Wildlife Refuge (Jorgenson et al. 2009)

Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Selawik National Wildlife Refuge. Pending evaluation.
Unknown
2019-09-30 14:01:36 -0800
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AVA-AK: Southwest Alaska Alders (Talbot et al. 2005)

Arctic Vegetation Archive - Alaska: Southwest Alaska Alders. Talbot, S., S. L. Talbot and F. J. A. Daniëls. 2005. Comparative phytosociological investigation of subalpine alder thickets in southwestern Alaska and the North Pacific. Phytocoenologia, 35(4): 727-759. Pending evaluation.
Unknown
2019-10-02 13:51:40 -0800
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AVA-AK: Southwest Alaska Vegetation Plots

Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Southwest Alaska Vegetation Plots Pending evaluation.
Unknown
2019-09-30 14:07:26 -0800
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AVA-AK: Toolik Lake Vegetation Plots (Walker and Barry 1991)

Aava tooliklake dwalker 1991 a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Toolik Lake Vegetation Plots. The vegetation of the Toolik Lake area was described and mapped by D. A. Walker et al. during the Department of Energy R4D (Response, Resistance, and Resilience to, and Recovery from Disturbance in Arctic ecosystems, Grant No. DE-FG02-84ER60242.A006) study in 1988-89. Toolik Lake is a glaciated landscape in the southern...
Complete
1988-08-01
1989-08-26
2019-09-30 14:08:29 -0800
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AVA-AK: Tundra Fires (Breen 2015)

Breen tundra fire Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Tundra Fires. The vegetation associated with tundra fire scars on the Seward Peninsula and northern foothills of the Brooks Range in Arctic Alaska was surveyed in the field during late June and July 2011 and 2012. This research was supported by USGS Alaska Science Center grants to Amy Breen and Teresa Hollingsworth (Seward Peninsula) and Benjamin Jones...
Ongoing
2011-06-23
2019-09-30 14:10:03 -0800
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AVA-AK: Umiat (Churchill 1955)

Umiat%28umiat ec%29 Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Umiat. Early vegetation sampling on Alaska’s North Slope was undertaken by Ethan D. Churchill while stationed at Umiat on the Colville River. Churchill’s field work, completed in July and August of 1951, endeavored to identify plant communities, determine their relationship to environmental conditions, and obtain data for aerial photographic...
Complete
1951-07-01
1951-08-31
2019-09-30 14:20:00 -0800
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AVA-AK: Unalaska Vegetation Plots (Talbot et al. 2010)

Aava unalaska stalbot 2010 sitephoto Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Unalaska Vegetation Plots. In 2007, one of the first quantitative studies of vegetation from sea level to alpine on Unalaska Island in the Aleutian Islands was completed (Talbot et al. 2010). The focus of the study was to 1) describe the major plant communities along environmental gradients, 2) identify the main vegetation types and communities and...
Complete
2007-08-03
2007-08-22
2019-09-30 14:11:43 -0800
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AVA-AK: Western Alaska Vegetation Plots (Hanson 1951)

Hhanson 1951 ecol monograph plantcomm westalaska page 30 image 0002 Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Western Alaska Vegetation Plots. Sampling of grassland, marsh and other plant communities across Alaska was completed by Hanson (1951) to learn about community floristic composition, cover, frequency, environmental relationships, geographic distribution, and relationships between communities and plant succession. Stands were sampled in the vicinity of...
Complete
1949-08-10
1949-08-15
2019-09-30 14:22:22 -0800
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AVA-AK: Willow Vegetation Plots (Schickhoff 2002)

Aava willows schickhoff 2002 a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Willow Vegetation Plots. The riparian vegetation in arctic Alaska mainly consists of willow shrub communities that are functionally important components of arctic landscape ecosystems. Willow communities along a south-north transect from the Brooks Range to Prudhoe Bay were described by Schickhoff et al. (2002). Support for the project was provided by the...
Complete
1997-07-09
1997-08-17
2019-09-30 13:53:08 -0800
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AVA-AK: Yukon-Kuskokwim Delta Plots

Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Yukon-Kuskokwim Delta Plots. Pending evaluation.
Unknown
2019-09-30 14:28:10 -0800
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AVA-CA: High Arctic Canada, Green Cabin, Banks Island Vegetation Plots (Vonlanthen et al. 2008)

Aava hacgrncabin cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Canada: High Arctic Canada, Green Cabin, Banks Island Vegetation Plots. The vegetation at Green Cabin on Banks Island, Canada were studied as part of a multi-year project focused on the bicomplexity of patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features caused by differential freezing processes in...
Complete
2003-07-08
2003-07-12
2019-09-27 17:10:01 -0800
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The Alaska Arctic Vegetation Archive (AVA-AK)

Phyt http://dx.doi.org/10.1127/phyto/2016/0128 Phytocoenologia 46:221-229 Walker, D.A. 2016 The Alaska Arctic Vegetation Archive (AVA-AK, GIVD-ID: NA-US-014) is a free, publically available database archive of vegetation-plot data from the Arctic tundra region of northern Alaska. The archive currently contains 24 datasets with 3,026 non-overlapping plots. Of these, 74% have geolocation data with...
Complete
2016-09-01
2018-08-09 15:17:13 -0800
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Alaska Arctic AVHRR NDVI Map

Aga arctic ak avhrr ndvi 1995 Alaska Geobotany Center (AGC) - The normalized difference vegetation index (NDVI) is a measure of greenness. NDVI was calculated as: NDVI = (NIR - R) / (NIR + R), where NIR is the spectral reflectance in the AVHRR near-infrared channel (0.725-1.1 µm, channel 2) where light-reflectance from the plant canopy is dominant, and R is the reflectance in the red channel (0.5 to 0.68 µm, channel 1), the portion of the spectrum where...
Complete
2019-08-26 13:59:23 -0800
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Alaska Arctic Bioclimate Subzone Map

Aga arctic ak bioclimate 2005 Alaska Geobotany Center (AGC) - Various authors, working with different geobotanical traditions, have divided the Arctic into bioclimatic regions using a variety of terminologies. The origins of these different terms and approaches have been reviewed by the Panarctic Flora (PAF) initiative (Elvebakk 1999). The PAF and CAVM accepted a five-subzone version of the Russian zonal approach. The subzone boundaries are somewhat...
Complete
2019-08-15 13:34:19 -0800
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