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22,549 results for “AND LTER”
Measurement of Plant Traits on Hylocomium splendens Samples Collected at Sites within the Bonanza Creek LTER Regional Site Network in Interior Alaska, 2019
This dataset contains measurements of plant traits on Hylocomium splendens species collected at a subset of sites from the Regional Site Network (n = 26). The two species, Hylocomium splendens and Vaccinium uliginosum, are the two most ubiquitous nonvascular and vascular species at these sites. The traits measured on these species relate to the fire ecology of each species. Traits measured for Hylocomium splendens include: length, width, aspect ratio (width/length), specific leaf area (SLA) and moisture content % at maximum water retention capacity. There is a corresponding dataset with trait data for Vaccinium uliginosum.
Measurement of Plant Traits on Vaccinium uliginosum Samples Collected at Sites within the Bonanza Creek LTER Regional Site Network in Interior Alaska, 2019
This dataset contains measurements of plant traits on Vaccinium uliginosum species collected at a subset of sites from the Regional Site Network (n = 26). The two species, Hylocomium splendens and Vaccinium uliginosum, are the two most ubiquitous nonvascular and vascular species at these sites. The traits measured on these species relate to the fire ecology of each species. Traits measured for Vaccinium uliginosum include: rhizome depth, number of rhizomes, plant height, moisture content % of aboveground tissues, aboveground tissue ratios and dry mass of leaves. There is a corresponding dataset with trait data for Hylocomium splendens.
Sap Flux and Microclimate Data for Co-Occurring White Spruce and Paper Birch at an Intermediate Aged Stand in the Bonanza Creek LTER Regional Site Network 2013-2018
This dataset contains hourly mean sap flux density and microclimate data for co-occurring white spruce and Alaska paper birch from early June of 2013 to mid-September of 2018. The data were published as part of a 2021 article in Journal of Ecology.
Vegetation surveys at CAP LTER ripirain-area bird-monitoring locations in the greater Phoenix metropolitan area (2013)
Over the past half-century, the greater Phoenix metropolitan area (GPMA) has been one of the fastest growing regions in the US, experiencing rapid urban expansion in addition to urban intensification. This backdrop provides an ideal setting to monitor biodiversity changes in response to urbanization, and the CAP LTER has been using a standardized point-count protocol to monitor the bird population throughout the GPMA and surrounding Sonoran desert region since 2000. A subset of these bird-monitoring sites are located in riparian areas, and additional riparian-area monitoring locations centered on the Salt River as it runs through the GPMA were added in 2013 and 2014. In May and June of 2013, the CAP LTER surveyed the vegetation in 6,400 square meter plots around all of these riparian-area sites as part of an analysis of change in bird abundance and community composition. This dataset catalogs the results of vegetation surveys at nineteen bird-monitoring sites in riparian areas of the GPMA.
Assembled file of one minute averages for high resolution surface meteorological (Met) and sea water intake (SWI) data from continuous underway measurements from CCE LTER process cruises in the CCE region, 2006 - 2019.
As the research vessel is underway for the duration of a CCE Process Cruise (since 2006, ongoing), 30 parameters are continuously measured regarding the oceanographic surface and atmospheric and navigational environment of the vessel, along the ship's trackline in the CCE region.
Measurements, from CCE LTER process cruises in the California Current region, of total dissolvable inorganic concentrations of the nutrient iron, 2017 - (ongoing).
Seawater profiles or discrete samples for total dissolvable iron (TDFe) analysis are collected with the trace metal rosette or GO-FLO bottles, respectively, in stations located within the CCE LTER region in the California Current System. The total dissolvable iron concentration is obtained by collecting unfiltered seawater samples in 250 mL LDPE bottles and storing them at pH 1.8 for 6 months or more. The acidified seawater sample is then filtered using acid cleaned 0.4 um PES membrane Titan 3 syringe filters and determined by flow injection chemiluminescent (FI-CL) analysis at Scripps Insitution of Oceanography since 2017 (ongoing).
Conductivity Temperature Depth (CTD) Log of CTD casts from CCE LTER process cruises in the CCE region, 2006 - 2019 (ongoing).
Individual casts of Conductivity, Temperature and Depth (CTD) are logged on CCE Process cruises (since 2006, ongoing) in the Southern California region. The log includes time, location, number of bottles, cast and event numbers and other information about CTD casts.
Net nitrogen mineralization and nitrification across Long Term Ecological Research (LTER) Sites
This project organizes data files and code associated with a study evaluating the effect of soil C concentration in the relationship between net N mineralization and net nitrification across terrestrial Long Term Ecological Research (LTER) sites in North America. Data were aggregated from publically-available LTER databases. Replicated-averaged data and code to replicate figures and analyses in Gill et al. 2022. Soil carbon availability decouples net nitrogen mineralization and net nitrification across United States Long Term Ecological Research Site. Biogeochemistry.
Tree census, demography, and exposed canopy area data at the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrological Laboratory, Otto, NC from 1993 to 2016
The five Terrestrial Gradient sites were established in the early 1990s as part of the 1990 Coweeta LTER Renewal. The original terrestrial gradient sites were 20 x 40-m. In the late 1990s the plots were expanded to 80 x 80-m and later (around 1998) they were slope-corrected by Clark's lab using survey equipment. Much of the Coweeta LTER “core” datasets have been collected from the gradient plots. This study is one of the long-term studies that are ongoing with defined sampling intervals. The tree demography and census study consists of trees census every two years and seeds collected ~5 x each year.
Forest floor Carbon & Nitrogen pools at the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrological Laboratory, Otto, NC.
This project is part of a larger examination of site productivity along an elevational gradient. Forest floor weights, %C, and %N were measured at each of the five terrestrial gradient plots located along an elevational gradient at Coweeta Hydrologic Lab, Otto, NC.
Fish collections at Coweeta LTER 100 m stream sites from 1991 to 1998
We monitored fish populations at three sites in a southern Appalachian stream system during a 40-month study. Electro-fishing was performed biannually in spring (May) and late summer(Aug-Oct), to assess stream fish populations, production and recruitment in the LTER 100m sites: Coweeta Creek, Lower Ball Creek, and Upper Ball Creek. These data will be used with habitat availability estimates recorded during the same time periods to see if fish assemblages structure and production of species differ along the gradient in concordance with changing abundance of patch types.
Coweeta LTER Environmental Sensor Station Network
Coweeta LTER maintains a network of more than 60 environmental sensor stations at locations throughout the Coweeta Hydrologic Laboratory, western North Carolina, and Georgia. The stations provide long-term monitoring of various environmental parameters. This dataset provides various files with location descriptions, coordinates, and other information about the sites. The data is split between the sites inside and outside of the lab boundaries.
The Salinity and phosphorus mesocosm experiment in freshwater sawgrass wetlands: Determining the trajectory and capacity of freshwater wetland ecosystems to recover carbon losses from saltwater intrusion (FCE LTER), Florida, USA from 2015 to 2018
In experimental wetland mesocosms located at Florida Bay Interagency Science Center, Key Largo, Florida, researchers continuously added salinity (approximately 6.9 g salt d-1) and phosphorus ( approximately 0.5 mg P d-1) to Cladium jamaicense peat monoliths from February 2015 to February 2017 and quantified changes in carbon partitioning. Several studies, focusing on the functional roles of marsh, soil, periphyton and microbe in the sawgrass-peat ecosystem, summarized detailed methodology and results (Wilson et al. 2019; Servais et al. 2019; Mazzei et al. in press). Briefly, salinity was increased (~10 ppt) and phosphorus was added (0.45 mg P d-1) to simulate four treatment effects (n = 24 plots): i) freshwater and no-added phosphorus, ii) freshwater and added phosphorus, iii) saltwater and no-added phosphorus, and iv) saltwater and added phosphorus. Upon the termination of manipulation study (early February 2017), containers holding water and peat-sawgrass cores were drained, rinsed, and refilled with only freshwater without any added nutrient and salt. Then, we experimentally restored freshwater to previous treatment and control mesocosms from February 2017 to June 2018 to examine the capacity of wetland ecosystems to recover carbon losses from saltwater intrusion. Note that FCE1226_Water_quality.csv summarizes water quality during both the manipulation and restoration study; however, all other files in the Dataset Title section only summarize results from the restoration study. Detailed methodology is provided below.
Fall 2013 grasshopper monitoring -- mid-marsh grasshopper abundance and species diversity at eight GCE LTER sampling sites
Grasshopper abundance and species diversity were investigated at eight sampling sites within the Georgia Coastal Ecosystems (GCE) LTER study area in August 2013. Visual surveys were conducted along 8 2m by 10m transects randomly allocated within the mid-marsh zone at each site. All grasshoppers observed within each transect were counted and identified to species, if possible. This survey was conducted as part of the GCE invertebrate monitoring program, and will be performed annually to assess long-term changes in relative species abundances across the GCE study area.
Annual ground-based photographs taken at 15 net primary production (NPP) study sites at Jornada Basin LTER, 1996-ongoing
This data package contains a list of ground-based photographs taken at fifteen Net Primary Production (NPP) study sites at the Jornada Basin LTER. Sites were selected to represent the 5 major ecosystem types in the Chihuahuan Desert (upland grasslands, playa grasslands, mesquite-dominated shrublands, creosotebush-dominated shrublands, tarbush-dominated shrublands). For each ecosystem type, three sites were selected to represent the range in variability in production and plant diversity; thus the locations are not replicates. At each site, a 1 hectare area was fenced in 1988 and a grid of 49 (48 at one playa location) 1m x 1m replicate quadrats was laid out when vegetation sampling began in 1989. Beginning in 1996, annual photos were taken from each of the 4 corners of each of the 15 70-meter x 70-meter NPP sites between August and November, depending on other research activity constraints. From 1996-2002 photos were taken using 35mm color slide film. Beginning in 2003, digital photos were taken in JPG format. Occasionally, supplemental photos may be taken at the same time that provide additional habitat information at the landscape, patch, or plant species level. No photographs were taken in 2013. Photo files (.jpeg format) are included in annual ZIP archives attached to this data package. This is an ongoing dataset that is updated once per year.
Perennial species canopy cover across grazed/ungrazed fencelines at the Jornada Basin LTER, 1986-ongoing
This ongoing data set contains percent canopy cover estimates of perennial plant species from transects that cross a grazed/ungrazed boundary fenceline of a single exclosure on the New Mexico State University Chihuahuan Desert Rangeland Research Center in Dona Ana County, New Mexico, USA. In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). The exclosure lies along a northeast facing piedmont slope at the base of a steep isolated mountain peak, and covers a variety of component landforms from the foot of the mountain to the basin floor. This provided the opportunity to investigate the response of vegetation with respect to landscape characteristics as well as release from grazing. This summary data set consists of percent canopy cover of all perennial plant species from the plant line intercept measurements on either side of the LTER-I exclosure East and West boundary fence. Sampling occurs approximately every five years; it was last conducted in November 2015 and will take place again in 2020.
Canopy cover for 9 perennial plant taxa across grazed/ungrazed fencelines at the Jornada Basin LTER, 1982-ongoing
This ongoing data set contains percent canopy cover estimates of 6 perennial plant species and 3 genera from transects that cross a grazed/ungrazed boundary fenceline of a single exclosure on the New Mexico State University Chihuahuan Desert Rangeland Research Center in Dona Ana County, New Mexico, USA. In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). The exclosure lies along a northeast facing piedmont slope at the base of a steep isolated mountain peak, and covers a variety of component landforms from the foot of the mountain to the basin floor. This provided the opportunity to investigate the response of vegetation with respect to landscape characteristics as well as release from grazing. This data set is limited to 6 perennial species and 3 genera because of the limited taxonomic resolution of the initial sampling in 1982. See data package knb-lter-jrn.210120001 for a dataset that contains all perennial species encountered but begins in 1986 instead of 1982. Sampling occurs approximately every five years; it was last conducted in November 2015 and will take place again in 2020.
Nematode abundance in soil cores collected beneath mesquite trees in irrigated and non-irrigated plots at the Jornada Basin LTER site, 1988
This data package contains nematode abundance in soils subjected to an irrigation experiment in mesquite coppice dune habitats during the early years of Jornada Basin LTER (LTER-I and II). The purpose of this study was to quantify total nematode abundance, and the abundance of nematode functional groups, in irrigated and non-irrigated (control) soils beneath mesquite plants (Prosopis glandulosa). Soil cores were taken from three depths (0-50cm, 50-100cm, and 100-150cm) then divided into subsamples for nematode investigation. Nematodes were quantified via a semi-automatic elutriator with sugar flotation-sieving and the Baerman Funnel technique. Nematodes were counted and separated into trophic groups: fungal feeders, bacterial feeders, plant parasites, and omnivore-predators. The data collection began in March 1988 and ended in October 1988. This dataset is complete.
Surface soil analyses from a range of mesquite sites at Jornada Basin LTER, 1986
This data package contains data from a series of analyses of surface soils in mesquite habitats during the early years of Jornada Basin LTER (LTER-I and II). The objective of the study was to determine whether there have been changes in the structure and function of the surface (0-20cm) soil system, the zone most affected by litter decomposition, associated with the rapid movement of mesquite (Prosopsis glandulosa) from historical habitats (arroyo and playa fringe) into recent habitats (grassland and dunes). The mesquite soils were sampled at 4 habitats (playa, coppice dune, arroyo, and grassland) in October 1986, with subsamples analyzed and incubated in the laboratory thereafter. This data set contains analyses for gravimetric soil moisture, pH, phosphate, total Kjeldahl nitrogen, total phosphorus, NO3-N nitrogen mineralization, total inorganic nitrogen, NH4 nitrogen mineralization, organic carbon, inorganic carbon, total roots, tap roots, intermediate roots, and fine roots. This data set is complete.
Soil carbon, soil nitrogen, and geometry of 30 playas and their catchment areas at the Jornada Basin LTER site in 2012
This data package contains soil carbon and nitrogen data at a range of soil depths from 30 ephemerally-flooded desert wetlands, or playas, in the Jornada Basin of southern New Mexico, USA. We conducted this study to assess how catchment biophysical variables control soil organic carbon and nitrogen in playas and how playas function differently than upland ecosystems. We chose 30 playas from across this Chihuahuan Desert Basin and collected 36 soil samples from four depths and nine locations. Soil cores samples were taken along two perpendicular transect lines to account for a topographic gradient from the edge of the playa to the center of the playa. At each of the nine locations, one sample was collected at four depths (0–10 cm, 10–30 cm, 30–60 cm, 60–100 cm). We measured soil organic carbon and total nitrogen concentrations in these soils using elemental combustion analysis. Using bulk density measurements for each depth range (m), we converted each soil measurement (g/g) to calculate concentrations of organic carbon and nitrogen per unit area (g/m^2) within the depth-ranges sampled. Data on the geometry of the playas and their associated catchments is also provided. This study is complete. For further information, refer to: McKenna, Owen P., and Osvaldo E. Sala. "Biophysical controls over concentration and depth distribution of soil organic carbon and nitrogen in desert playas." Journal of Geophysical Research: Biogeosciences 121, no. 12 (2016): 3019-3029. https://doi.org/10.1002/2016JG003545
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