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69 results for “Bonanza Creek Experimental Forest”
Snowshoe hare pellet count data in Bonanza Creek Experimental Forest
Snowshoe hares, Lepus americanus, are a 'keystone' prey species in northern boreal forests and experience population fluctuations of 8-11-years. Despite intense responses of both vegetation and predators to changes in hare densities, landscape-scale comparisons of hare populations in Alaska have been limited to qualitative descriptions. We conducted capture-recapture studies of snowshoe hares at 5 locales in the Tanana valley, from Tok in the east to Clear in the west from 1999 to 2002. Snowshoe hare densities were highest in 1999 ( =6.36 ha-1, SE=0.63) and declined thereafter. We were unable to detect declines in apparent survival during declining densities in our study populations. Movement distances did not vary temporally and persistence of individuals through declining densities may be associated positively with body condition at the peak. The relationship of hare pellets and hare densities was weak and limits the utility of this methodology for estimating hare densities in Interior Alaska.
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.
Fates and morphometrics of snowshoe hares collared in Bonanza Creek Experimental Forest from 2008 to present
This dataset contains the fates and morphometric measurements of snowshoe hares collared in Bonanza Creek Experimental Forest, including dates of collaring and recovery, cause or mortality, weight, hind foot length, and sex.
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.
Structural cover at snowshoe hare predation sites in Bonanza Creek Experimental Forest from 2008 to 2012
This dataset contains the horizontal and canopy cover measured at predation sites of snowshoe hares that were collared in Bonanza Creek Experimental Forest.
Rain, well and river water oxygen and deuterium isotope analyses/values for Bonanza Creek Experimental Forest and LTTG sites ( 2002 - Present)
Isotope values for oxygen and hydrogen in waters provide information as to the source of the water, the climate at the time of collection, and the geographical location of the water source. Climate variations may be indicated in changes in the relationship between deuterium and 18O over an extended period. The sources and proportions of sources of ground water can be determined by isotope analysis. Rain, well and river waters were analyzed for ?18O and ?D values from LTER and LTTG sites in 2002, and LTER1, LTER2, UP2, and FP3 sites from 2003 on. Deuterium values were not replicable until the latter part of the 2005 field season and so were not reported until August, 2005.
Bonanza Creek Experimental Forest Precipitation (Water Buckets/Rain Gauges) at BCEF LTER sites: Weekly
Three (in clearings) or four (under canopies) Weather Bureau standard rain gauges have been placed on stands at a height of approximately 1 m at each site with meteorological measurements. Rainfall is measured each week during the summer with a dip stick. Measurements are entered into the computer and averaged by site and date. Prior to 1991 measurements were in inches. These data have been converted to mm.
Soil Respiration in Bonanza Creek Experimental Forest from Upland and Floodplain sites 1990-1992
This study is designed to evaluate total soil respiration among stages of forest succession in upland secondary and floodplain primary succession, and in relation to the impact of additions of carbon substrates of differing decomposibilities to the forest floors of these successional stages. The inverted bucket, soda-lime procedure was used to obtain weekly estimates of total soil respiration for three years during the growing season.
Soil Respiration in Bonanza Creek Experimental Forest Floodplain Black Spruce Sites
Fine root processes play a prominent role in the carbon and nutrient cycling of boreal ecosystems due to the high proportion of biomass allocated belowground and the rapid decomposition of fine roots relative to aboveground tissues. To examine these issues in detail, major components of ecosystem carbon flux were studied in three mature black spruce forests in interior Alaska, where fine root production, respiration, mortality and decomposition, and aboveground production of trees, shrubs and mosses were measured relative to soil CO2 fluxes. Fine root production, measured over a 2-year period using minirhizotrons, varied from 0.004 ? 0.001 mm cm-2 d-1 over winter, to 0.051 ? 0.015 mm cm-2 d-1 during July, with peak growing season values comparable to those reported for many temperate forests using similar methods. On average, 84% of this production occurred within 20 cm of the moss surface, although the proportion occurring in deeper profiles increased as soils gradually warmed throughout the summer. Monthly rates of production and mortality were somewhat asynchronous because mortality tended to peak during fall and be minimal during periods of peak production. Production and mortality were, however, positively correlated across all tubes and time periods (r2 = 0.42, P < 0.0001). Annual fine root production averaged 2.45 ? 0.31, 8.01 ? 1.39, and 2.53 ? 0.27 mm cm-2 yr-1 among the three sites, when averaged across years. Fine root survival and decomposition were measured by tracking and analyzing the fate of individual fine roots using mark-recapture techniques. Fine root survival was greatest during periods of peak root growth, and least over winter (?time). Roots first appearing in the middle of the growing season had higher survival rates than those first appearing early or late in growing season, or over winter (?cohort), and risk of mortality decreased with root age (?age). Survival estimates translate to mean life spans of 108 ? 4 days during the growing season
Artificial Communities Seedling Growth: Bonanza Creek Experimental Forest (planted in 1989; measured in 1992, 1995, and 2002).
This study considers the relative role of competition and facilitation in primary succession of the boreal forest floodplain of Bonanza Creek Experimental Forest. Alder (Alnus tenuifolia Nutt.) is an early colonist of young floodplain sites, where it contributes greatly to soil development through the addition of nitrogen to the soil. White spruce (Picea glauca (Moench.) Voss) typically colonizes such sites later; it becomes established beneath a canopy of alder and willow (Salix spp.) which is sometimes overtopped by young balsam poplar (Populus balsamifera L.). The alder may potentially influence white spruce both positively and negatively. Possible facilitative effects include protection of small seedlings from excess heat or heavy siltation accompanying flooding and addition of soil nitrogen, an effect that may extend for many years. Competition for light (and other resources) before the white spruce has overtopped the alder canopy may prove to be a major negative effects. This study seeks to determine the net balance of these effects on the floodplain successional sequence by planting spruce seedlings with and without the presence of alder. Plots of white spruce seedlings were planted in 1989 on an early successional silt bar with and without alder in the Bonanza Creek Experimental Forest. Biomass by species and carbon and nitrogen pools of plants and soils were measured in 2002. Height and survivorship of spruce seedlings were measured in 1992, 1995, and 2002. White spruce grew more rapidly in the presence of alder during the first six years. After 13 years, however, seedlings planted with alder experienced high mortality due to intensive browsing by snowshoe hares. Alder resulted in greater total biomass and larger carbon and nitrogen pools in plants and soils.
Bonanza Creek Experimental Forest: Weekly TDR measurments at core upland and floodplain sites.
Weekly measurements of soil moisture detected with Time Domain Reflectometry using a TRASE TDR system that was operated from 1992 through 2002.
Core Meteorological Measurements for the APEX Alpha Fen Bonanza Creek Experimental Forest: 2007-Present
Air temperature, relitive humidity, barometric pressure, net radiation, and precipitation were recorded every half hour at the APEX alpha Fen. APEX Fen is located in the Bonanza Creek LTER outside of Fairbanks, AK. APEX Fen uses a full-factorial water table (flooded or raised, lowered or drained, and control treatments, as well as a moisture gradient) by warming manipulation (warmed, unwarmed treatment).
Bonanza Creek Experimental Forest Beetles Per Trap Beginning in 1975 - Kruse
This is a more detailed datafile then the previous method of reporting found in the datafile: Bonanza Creek Experimental Forest Bark Beetle Per Trap 1Begining in 1975 - Werner. Starting 2010 it contains counts of all woodboring insects and bark beetles caught in the pheromone baited traps, and retains information at the individual sample level.
Bonanza Creek Experimental Forest Defoliating Insect Population Levels Per Leaf Beginning in 1975 - Kruse
The datafile has more detailed information including host species, a wider array of target species, date of sampling etc then the previous method of reporting found in Bonanza Creek Experimental Forest Defoliating Insect Population Levels Per Leaf Beginning in 1975 -Werner. The more detailed information was recorded starting in 2010.
Densities of snowshoe hares at Bonanza Creek Experimental Forest
Snowshoe hares, Lepus americanus, are a 'keystone' prey species in northern boreal forests and experience population fluctuations of 8-11-years. Despite intense responses of both vegetation and predators to changes in hare densities, landscape-scale comparisons of hare populations in Alaska have been limited to qualitative descriptions. We conducted capture-recapture studies of snowshoe hares at 5 locales in the Tanana valley, from Tok in the east to Clear in the west from 1999 to 2002. Snowshoe hare densities were highest in 1999 ( =6.36 ha-1, SE=0.63) and declined thereafter. We were unable to detect declines in apparent survival during declining densities in our study populations. Movement distances did not vary temporally and persistence of individuals through declining densities may be associated positively with body condition at the peak. The relationship of hare pellets and hare densities was weak and limits the utility of this methodology for estimating hare densities in Interior Alaska.
Foliage chemistry of the major tree and shrub species in Bonanza Creek Experimental Forest
Foliage (leaf tissue) chemistry across the various treatment and control plots in each of the successional stages of boreal forest located in the Bonanza Creek Experimental Forest.
Surface carbon, water and energy fluxes measured by eddy covariance at 3 sites within the Alaska Peatlands Experiment and Bonanza Creek Experimental Forest 2013-2016
These data are simultaneous and continuous measurements of carbon, water and energy fluxes of the terrestrial landscape. These fluxes are major regulatory drivers of the boreal climate system and form key linkages and feedbacks between the land surface, the atmosphere and the oceans. At the APEX project site, within Bonanza Creek Experimental Forest, this monitoring is repeated across a chronosequence of permafrost degradation; the Black Spruce site is an area of stable permafrost with intact black spruce forest (APEX gamma site), the Thermokarst site is an active thermokarst zone with considerable tree mortality (APEX betaSW site), the Fen site is within a stable treeless fen with deep active layer depth (APEX apexcon,low, and ele sites). The main variables being monitored are the instananeous fluxes of CO2, water vapor and surface energy (shortwave, longwave and net radiation), secondary variables included photosynthetically active radiation (PAR), air and soil temperatures, rainfall, snow depth, soil moisture content, wind direction and speed, and average atmospheric concentrations of CO2 and H2O through the year. Our site naming scheme is as follows: 1) gamma = Black Spruce site = YF_2472, 2) betaSW = Thermokarst site= BC_5166, 3) (apexcon+apexele+apexlow) = Fen site = BC_FEN
Alaskan Peatland Experiment (APEX): Ammonium Uptake Experiment I - Uptake Data Collected in 2016 at Lowland Bog Sites in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains data from an ammonium uptake experiment conducted at the APEX Beta site in the BCEF. Data includes ammonium uptake of Carex aquatilis roots from porewater spiked with (NH4)2SO4 for 4 and 8 hours after excavation from thermokarst bogs. Comparisons involve deep vs shallow roots and roots excavated from the edge and centre of thermokarst bogs.
Alaskan Peatland Experiment (APEX): Ammonium Uptake Experiment II - Size Characteristics of Carex aquatilis Plants Harvested in 2016 from Thermokast Features Located in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains data from an ammonium uptake experiment conducted at the APEX Beta site in the BCEF. Data includes size characteristics of Carex aquatilis plants harvested from the edge and centre of thermokarst features.
Plant-mediated root methane emissions and oxidation in a thermokarst bog complex in the Bonanza Creek LTER Experimental Forest I - Standard Oxic Methane Fluxes 2015
Vascular plants are important in the wetland methane cycle but their effect on production, oxidation, and transport has high uncertainty, limiting our ability to predict emissions. Vegetation operated on top of baseline methane emissions, which varied with proximity to the thawing permafrost margin. Emissions from vegetated plots increased over the season, resulting in cumulative seasonal methane emissions that were 4.1-5.2 g m-2 season-1 greater than unvegetated plots. Mass balance calculations signify these greater emissions were due to increased methane production (3.0-3.5 g m-2 season-1) and decreased methane oxidation (1.1-1.6 g m-2 season-1). Minimal oxidation occurred along the plant-transport pathway and oxidation was suppressed outside the plant pathway. Our data indicate suppression of methane oxidation was stimulated by root exudates fueling competition among microbes for electron acceptors. Root exudates are known to fuel methane production and our work provides evidence they also decrease methane oxidation. This dataset contains the 2015 weekly oxic methane flux from treatment plots within a bog complex in the Bonanza Creek LTER. Treatments include natural-vegetation, simulated-aerenchyma, and sphagnum-only. No updates are planned.
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