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1,787 results for “coweeta”
NRCS-USFS Soil Moisture Measurements - Coweeta Hydrologic Laboratory, NC, 2022-2025
This dataset consists of soil moisture (volumetric water content and water potential), temperature, and electrical conductivity measurements at multiple depths within 12 soil pedons distributed across Watersheds 32 and 7 at the Coweeta Hydrologic Laboratory from March 2022 to April 2025. This work is a part of a larger partnership between the U.S. Forest Service (USFS) and the Natural Resources Conservation Service (NRCS) to install, monitor and generate long-term soil moisture datasets across multiple forested watersheds in the U.S. Associated data packages from both the Fernow and Hubbard Brook Experimental Forests can be found on the EDI Data Portal. Dataset contributors: Project planning led by Carlos Quintero (USFS, ORISE), with help from Amos Stead (NRCS) and Tiffany Allen (NRCS) in site selection. Scientific and logistical support from Chris Oishi (USFS), Amanda Pennino (NRCS), and Erin Rooney (NRCS). Seth Strickland (USFS), Amos Stead (NRCS), Ann Tan (NRCS), and Tiffany Allen (NRCS) assisted with site installation. Site visits, data downloading, and logger maintenance was by Seth Strickland (USFS). The dataset was curated by Emily Piché (USFS, ORISE) and Amanda Pennino (NRCS). Overall partnership initiation and project management was by Stephanie Connolly (USFS) and Skye Wills (NRCS)
Measurements of Coarse Woody Debris %C and %N at the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrological Laboratory, Otto, NC.
Coarse woody debris (CWD) plays a critical role in nutrient retention and cycling, including the cycling and retention of carbon and nitrogen. However, comparison studies of CWD in different forest types and elevation gradients in the southern Appalachian Mountains are lacking. We measured CWD in five different forest communities/elevations at Coweeta Hydrologic Lab. A subsample of CWD in each plot was measured for percent C and percent N, as well as for cations.
Coarse Woody Debris Cations Measurements at the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrological Laboratory, Otto, NC.
Coarse woody debris (CWD) plays a critical role in nutrient retention and cycling, including the cycling and retention of carbon and nitrogen. However, comparison studies of CWD in different forest types and elevation gradients in the southern Appalachian Mountains are lacking. We measured CWD in five different forest communities/elevations at Coweeta Hydrologic Lab. A subsample of CWD in each plot was measured for percent C and percent N, as well as for cations.
Measurements of coarse woody debris at 10 hillslope sites at the Coweeta Hyrdological Laboratory, Macon County, North Carolina
Coarse woody debris was measured at 10 hillslope sites representing a gradient of development, including forested, valley agriculture, and mountain housing developments in Macon County, NC. The length, diameters, decay class, and species of coarse wood was measured within each of the twelve 10 x 10-m plots located within each of the 10 sites. Volume of coarse wood was then calculated. Data from a subset of the sites were used as a covariate for Aphaenogaster spp. ant occupancy rates.
Consequences of non-random tree species loss on litter mass loss, nutrient dynamics, carbon cycling, and decomposer communities across a terrestrial-aquatic interface at Coweeta Hydrologic Lab, Otto, NC
Although litter decomposition is a fundamental ecological process, most of our understanding comes from studies of single-species decay. Recently, litter-mixing studies have tested whether monoculture data can be applied to mixed-litter systems. These studies have mainly attempted to detect non-additive effects of litter mixing, which address potential consequences of random species loss. The focus is not on which species are lost, but the decline in diversity per se. Under global change, species loss is likely to be non-random, with some species more vulnerable to extinction than others. Under such scenarios, the effects of individual species (additivity) as well as of species interactions (non-additivity) on decomposition rates are of interest. To examine potential impacts of non-random species loss on ecosystems, we studied additive and non-additive effects of litter mixing on decomposition. A full-factorial litterbag experiment was conducted using four deciduous leaf species, from which mass loss and nitrogen content were measured. Data were analysed using a statistical approach that first looks for additive identity effects based on the presence or absence of species and then significant species interactions occurring beyond those. It partitions non-additive effects into those caused by richness and or composition.
Plethodon study from removal plots located at the Coweeta Hydrologic Laboratory
Recent research shows Plethodon shermani and Plethodon teyahalee within the hybrid zone at the Coweeta LTER in Otto, North Carolina forage heavily on ants (>50% of all prey items consumed; found in 94% of samples). As most vascular plants in the Southern Appalachians rely on ants for seed dispersal, this significant predation on ants, especially Aphaenogaster, reveals an intriguing and important relationship between these salamanders and the vascular plant abundance and distribution within their ecosystem. Additionally, consumption of ants increases with high temperatures and low relative humidity indicating that, with climate change, the effects of Plethodon foraging behavior on woodland biodiversity will be amplified. Using a paired design, we placed removal plots along an elevational gradient within the plethodon shermani-teyahalee hybrid zone at the Coweeta LTER to observe and quantify the effect of Plethodon foraging on ant communities, seed dispersal, and vascular plant distribution by removing the salamanders from treatment plots. Foraging rates of ants, with a focus on Aphaenogaster, were monitored at treatment and control plots using direct observation/counts of ants visiting tuna bait stations.
Coweeta Synoptic Data from 49 sampling sites in the Upper Little Tennessee River Basin from 2009 to 2010 (mesoscale habitat data)
This data was generated as part of synoptic sampling conducted at the Coweeta LTER between June 2009 and May 2010. 49 wadeable streams with low levels of development were sampled throughout the Upper Little Tennessee River Basin in the Southern Appalachians. Effects of riparian vegetative conditions on a suite of channel morphological variables were investigated: active channel width, variability of width within a reach, large wood frequency, mesoscale habitat distributions, median particle size, and percent fines. Stream mesoscale habitat areas for each 150 m stream reach were recorded in this particular dataset. At each site, a uniform 150 meter section of stream was surveyed. Observers kept a running tally of the areas associated with various mesoscale habitat units including, cascades, riffles, pools, alcoves, pocket water, runs, glides, and obstructions.
Terrestrial-Stream Biodiversity Litter Processing Datasets from Watershed 20 within the Coweeta Hydrologic Laboratory
Although litter decomposition is a fundamental ecological process, most of our understandings comes from studies of single-species decay. Recently, litter-mixing studies have tested whether monoculture data can be applied to mixed-litter systems. These studies have mainly attempted to detect non-additive effects of litter mixing, which address potential consequences of random species loss -- the focus is not on which species are lost, but the decline in diversity per se. Under global change, species loss is likely to be non-random, with some species more vulnerable to extinction than others. Under such scenarios, the effects of individual species (additivity) as well as of species interactions (non-additivity) on decomposition rates are of interest. To examine potential impacts of non-random species loss on ecosystems, we studied additive and non-additive effects of litter mixing on decomposition. A full-factorial litterbag experiment was conducted using four deciduous leaf species, from which mass loss and nitrogen content were measured. This study was conducted at the Coweeta Hydrologic Laboratory in Watershed 20 on Ball Creek that drains into Coweeta Creek, a tributary of the Little Tennessee River. Data were analyzed using a statistical approach that first looks for additive identiy effects based on the presence or absence of species and then significant species interactions occurring beyond those. It partitions non-additive effects into those caused by richness and/ or composition. This approach addresses questions key to understanding the potential effects of species loss on ecosystem processes. If additive effects dominate, the consequences for decomposition dynamics will be predictable based on our knowledge of individual species, but not statistically predictable if non-additive effects dominate.
Summer and winter invertebrate and physicochemical data from the Coweeta Hydrologic Lab
<p>This resource contains data for aquatic invertebrates collected from leaf litterbags, which were deployed in 11 streams at the Coweeta Hydrologic Lab (Macon County, North Carolina, USA) during winter and summer months in 2017-2018. Litterbags consisted of fine-mesh bags (250µm) attached to coarse-mesh bags (5mm), each containing <em>Rhododendron maximum</em> leaf litter. The litterbags were deployed for two-month periods, which were as follows: 19 October - 11 or 18 December, 2017; 15 November - 5 January 2017-2018; 9 May - 5 July 2018; and 5 July - 31 August 2018. We collected invertebrate samples from the >1mm size fraction from 3 coarse-fine litterbag pairs incubated in each of our streams during the aforementioned 2-month periods. Invertebrates were preserved in ethanol, identified, and classified into functional feeding groups based on classifications in Merritt et al. 2019. We identified invertebrates in the "shredder" functional feeding group to genus and all other insects to family (Merritt et al. 2019). We also measured invertebrate lengths in mm and converted these lengths to masses using information from Benke 1999. This resource also contains daily temperature and discharge data, litter breakdown data from the coarse-mesh bags associated with the invertebrate data, and weekly nutrient concentration data from the streams during the study period. Discharge data was provided by the USFS Coweeta Hydrologic Lab and can also be found here: https://www.fs.usda.gov/rds/archive/catalog/RDS-2016-0025-2</p> <p>Discharge data citation:</p> <p>USFS Coweeta Hydrologic Laboratory. 2023. Daily streamflow data for gauged watersheds at Coweeta Hydrologic Laboratory, North Carolina. 2nd Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2016-0025-2</p>
Litterfall on the elevational gradient (Group 1) at Coweeta Hydrologic Laboratory from 1992 to 1993
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 2) focusing on Rhododendrum leaf litter from the Coweeta Hydrologic Laboratory from 1994 to 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 3) from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 4) with a focus on greenfall from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 5) from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 6) from the Coweeta Hydrologic Laboratory from 1995 to 1996
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 7) in the Coweeta Hydrologic Laboratory from 1996 to 1998
Null Hypothesis: Litterfall weights are not statistically different between plots on the altitudinal gradient.
Dendrometer Band Measurements from the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrologic Laboratory, Otto, North Carolina.
Trees for this project were banded with aluminum bands and growth increment markers to accurately measure tree growth at multiple times during the year. Trees were located on each of the five terrestrial gradient plots. Tree species, initial diameter, and subsequent calculated diameters are included for each tree.
Fine root dynamics along an elevational gradient in the southern Appalachian mountains in the Coweeta Hydrologic Laboratory from 1993 to 1994
Annual rates of fine root mass appearance and disappearance were calculated from samples of fine roots taken in soil cores over time on the five gradient plots.
Fine root dynamics along an elevational gradient in the southern Appalachian mountains in the Coweeta Hydrologic Laboratory from 1994 to 1995 (lengths of fine root segments)
The lengths of fine root segments visible in photographs of roots growing against the windows of minirhizotron boxes were measured.
Canopy gradient frass from the Coweeta Hydrologic Laboratory from 1996 to 1998
Insect frass was collected for more than two years along an elevation gradient at Coweeta Hydrologic Laboratory.
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