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469 results for “spruce”
Soil temperature in Black Spruce Carbon cycling study along a temperature gradient in interior Alaska
Study conducted on black spruce C cycling study along a temperature gradient in interior Alaska from 1999 to 2002. The temperature gradient was established by locating sites in the Fairbanks area that varied in elevation and aspect. Measurements include:soil temperature, forest aboveground production, litterfall, decomposition of litter and cellulose proxies, soil carbon dioxide efflux, moss photosynthesis, soil moisture, foliar isotopes (15N and 13C).
White Spruce Seedling Counts at Bonanza Creek Experimental Forest Vegetation Plots (4-sq meters)
This study is a survey of the spruce seedlings of 24 LTER sites in Bonanza Creek Experimental Forest. The 24 sites are divided into three replicates for six primary successional stages onthe floodplains (3 replicates X 5 successional stages = 15 sites) and three replicates for three secondary sucessional stages in the uplands (3 replicates X 3 successional stages = 9 sites). White spruce seedlings were surveyed on some sites as early as 1975 and every 1-2 years from the 1980's through 2004. Seedlings are currently surveyed as part of the <a href="http://www.lter.uaf.edu/data_detail.cfm?datafile_pkey=530"> Shrub, Seedling and Sapling Density at Bonanza Creek LTER Research Sites (2006-Present) </a> data package.
Black spruce needle nitrogen concentration from 1998
We collected black spruce needle from one site located near Fairbanks Ak (S1: 64o52.164? N, 147o51.462? W) in August 1998. The needles were collected from 10 different trees, 5 leafage classes, 3 layers, 2 aspectss, and 3 replicates of each. Nitrogen concentration was measured on these needles. Data analysis indicated that canopy aspect and height did not significantly influence needle concentration, but needle age (F = 555, P < 0.0001) and individual trees within a stand (F = 108, P < 0.0001) combined to explain over 90% of the variation in foliar N.
Black spruce needle nitrogen concentration from 5 stands in 1999
We collected black spruce needle from several sites located near Fairbanks Ak, and Delta, Ak in August 1999 (Sites designated here as S1, S2, and S3) were located in Fairbanks (64o40?N, 148o15?W), Alaska (S1: 64o52.164? N, 147o51.462? W; S2: 64o52.058? N, 147o51.378? W; S3: 64o51.603? N, 147o52.789? W) with 2 additional sites (S4, S5) in Delta, Alaska (64010? N, 145030? W). In each stand, 30 trees were randomly selected for sampling. Within each tree, five shoots were collected from the southern aspect of the mid-canopy height from each of the following age classes: 0-, 1-, 4-, 9-, and 19-years old. In two of the Fairbanks stands (S2, S3), 19-year old needles were not present. A total of 690 samples over the five stands include 150 samples per stand in three stands (S1, S4, S5) and 120 samples per stand in the other two stands (S2, S3). Needles were returned to the lab and nitrogen content was determined. We used a three-factor nested analysis of variance (ANOVA) to evaluate differences in needle N concentration among the ages of needles on a tree, among trees nested within a stand, and among stands. Ages and stands were treated as fixed factors and tree was treated as a random factor. The ANOVA and means testing for these differences used Proc GLM in the SAS statistical package with needle N content as the dependent variable and needle age, tree, and stand as independent variables. The GLM procedure handled the problem of missing treatment combinations within the ANOVA. Type III sum of squares was used to test the effects of factors without interactions
White Spruce Seedling Demography and Browsing by Snowshoe Hares Inside and Outside the Moose-spruce Exclosures located along the Tanana River
This study started in September 2002 focused on the indirect effect of moose browsing on white spruce regeneration on the Tanana River floodplain. Twelve exclosures (7m X 10m, 2m high), with adjacent control plots of the same size, were constructed using chain-link fence panels. Exclosures were located along the Tanana River between FP 1A and FP 1C and instrumented with Hobo Microstations for monitoring of soil and air temperature, relative humidity, and PAR. Browsing effects on deciduous vegetation (biomass removal and canopy height) and soil properties were analyzed in relation to the performance (germination, growth and biochemistry) of planted white spruce seeds and seedlings (n=98/exclosure). Additionally, direct browsing by snowshoe hares on spruce seedlings (growth and survival) was evaluated in relation to canopy cover and terrace age. The study is ongoing. White spruce seedling height, basal diameter, browsing history, and survival were measured inside and outside the ten remaining paired exclosure and control plots located along the Tanana River floodplain in the summer of 2014.
Tree regeneration after fire: Wickersham Dome long-term vegetation study, bl. spruce cone analysis
These data represent the most recent set of observations (made in 2002 by J. Johnstone) for several long-term vegetation monitoring plots near Wickersham Dome that were set up by Les Viereck and Joan Foote following the 1971 wildfire and 1978 experimental burns. Earlier records are available in the BNZ long-term vegetation database. This dataset documents tree seedling/sapling and shrub measurements made in 2002. Contains counts of total numbers of cones on individual trees (black spruce only), along with tree height.
White Spruce NPP: Tree density and basal area by diameter sizeclass in upland and floodplain mid- and late-successional stands: 1989-2008
This data set is derived from BNZ LTER inventory plots. Stand density and basal area are listed by diameter size class of live white spruce trees for each replicate stand within mid-successional and mature white spruce stands within both floodplain and upland landscapes by year from 1989-2008.
White Spruce NPP: average NPP per tree by age cohort for 4 time periods between 1993 and 2008
This data set is derived from BNZ LTER inventory plots, where DBH of all trees is measured every 3 to 4 years, and increment changes in AG biomass are derived from allometric equations. Data included in this file were obtained from 1993, 1997, 2000, 2004 and 2008 inventories, generating 4 growth increments between 1997 and 2008. Data are reported by age cohort, and include NPP increments (averaged across all trees within each landscape and successional stage) for all trees of known age (determined from coring).
White Spruce NPP: average NPP per tree by diameter sizeclass for 4 time periods between 1993 and 2008
This data set is derived from BNZ LTER inventory plots, where DBH of all trees is measured every 3 to 4 years, and increment changes in AG biomass are derived from allometric equations. Data included in this file were obtained from 1993, 1997, 2000, 2004 and 2008 inventories, generating 4 growth increments between 1997 and 2008. Data are reported by diameter sizeclass (10 cm increments), and include NPP increments (averaged across all trees within each landscape and successional stage) for which adequate numbers of trees (typically >5) were present to obtain useful measurements (see N in data file).
White Spruce NPP per tree and per ha averaged across a 15 year period (1993 to 2008)
This data set is derived from BNZ LTER inventory plots, where DBH of all trees is measured every 3 to 4 years, and increment changes in AG biomass are derived from allometric equations. Data included in this file were obtained from 1993, 1997, 2000, 2004 and 2008 inventories. Data are reported by diameter sizeclass (10 cm increments), and include NPP (averaged across all trees within each landscape and successional stage) expressed on a per tree (kg biomass/tree/year) and a per ha (kg biomass/ha/year) basis.
White Spruce NPP per tree calculated from dendrometer bands annually from 1994 to 2008
This data set is derived from BNZ LTER inventory plots, where band dendrometers are in place on trees within each diameter size class (typically 10 trees per 10 cm increment diameter size class). Dendrometer bands are read in the fall each year. Biomass is calculated from allometric equations, from which annual biomass increments are derived. Data are reported as the average annual growth per tree across all trees within a given landscape and successional stage and reported as kg biomass/tree/year.
White spruce tree diameter vs age in mid-successional and late-successional long-term Bonanza Creek LTER inventory plots
This data lists age and diameter for white spruce trees of varying diameters growing in mid and late successional long-term BNZ LTER inventory plots in floodplain and upland landscapes.
APEX gamma black spruce site: hourly soil temperature, soil moisture, air temperature and RH and photosynthetically active radiation (PAR).
This dataset contains hourly averages of air temperature and RH, soil temperature and moisture, and PAR. This basic environmental data supports the other research that is going on at this site.
Black spruce soil delta15N values from 31 sites centered around Fairbanks, AK collected in 2007.
This dataset contains delta 15N values of bulk organic soils, dissolved organic nitrogen, ammonium, and nitrate. Soil delta 15N values were measured using the denitrifier method at the University of Florida.
Canopy cover in mature black spruce forest, mature mixed forest, and early successional forest in Bonanza Creek Experimental Forest
This dataset contains measurements of canopy cover in three habitats commonly used by snowshoe hares in Bonanza Creek Experimental Forest.
Horizontal cover in mature black spruce forest, mature mixed forest, and early successional forest in Bonanza Creek Experimental Forest
This dataset contains measurements of horizontal cover (i.e. visual obstruction) in three habitats commonly used by snowshoe hares in Bonanza Creek Experimental Forest.
Post-fire succession in Delta Junction burns: Measurements of aspen and spruce stem density and biomass in 1987, 1990, 1994 and 1999 burns
This dataset contains measurements of stem density and biomass of aspen and black spruce taken during summer 2008 in 4 burns located near Delta Junction (1987, 1994, 1999) and Tok (1990). These data can be found in Shenoy et al. 2011.
Post-fire succession in 1994 Hajdukovich Creek burn: Measurements of aspen and black spruce stem density
This dataset contains measurements of stem density of aspen and black spruce taken during summer 2009 in the 1994 Hajdukovich Creek burn.
Post-fire succession in 1994 Hajdukovich Creek burn: Measurements of aspen and black spruce biomass
This dataset contains measurements of biomass of aspen and black spruce taken during summer 2009 in the 1994 Hajdukovich Creek burn.
Post-fire succession in 1994 Hajdukovich Creek Burn: in-situ measurements of aspen and spruce inorganic nitrogen uptake rates
This dataset contains in-situ measurements of inorganic nitrogen uptake rates in aspen and spruce saplings regenerating in one severely and one lightly burned site in the 1994 Hajdukovich Creek burn.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
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OpenNeuro
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