Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
1,605
datasets available to search
ShareScore release 0.9.0
Dataset results
1,605 results for “1995”
Biogeochemistry of Permafrosted/NonPermafrosted Watersheds in CPCRW: Summer 1995
Chemical measurements of groundwater, soil water and stream water were made in watersheds C2 and C3 in CPCRW (DOC, DON, NO3-N, NH4-N, Al, Mg, Ca, Mn, Si, K, Na, SO4 and conductivity). One watershed C3 had extensive permafrost and the other C2 had limited permafrost. Stream discharge data was collected from permanently installed flumes. Soil water retained within the rooting zone (0.3 - 0.5 m) was high in DOC, DON and DIN but low in dissolved minerals (dominantly Ca, Mg and Na) and conductivity. The reverse was true for groundwater from springs and wells. Permafrost in C3 prevented deep percolation of water and generated stormflows rich in DOC. Stormflow accounted for 24% of total streamflow in C3 but only 3% of total streamflow in C2. The presence of permafrost appears to result in higher fluxes of DOC, DON and DIN into stream water from upland soils.
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.
Landuse classification of central Arizona-Phoenix 1912 to 1995
This dataset is part of a time series of maps that encompasses the development of the entire 20th century. Landuse categories include Urban, Agriculture, Desert, and Recreation. The development of these maps is to describe the nature of the change of each category between years. Based upon available data, the years used for this dataset are 1912, 1934, 1955, 1975, and 1995. Data sources used include U.S. Soil Conservation Service air photos, USGS topographic maps, Glendale Historical Society, Salt River Project historical agricultural data, and Arizona Department of Water Resources historical agricultural data.
Growth-mortality relationships for southern Appalachian trees from the Coweeta Hydrologic Laboratory in 1995
Ecologists and foresters have long noted a link between tree growth rate and mortality, and recent work suggests that interspecific differences in low growth tolerance is a key force shaping forest structure. Little information is available, however, on the growth-mortality relationship for most species. We present three methods for estimating growth-mortality functions from readily obtainable field data. All use annual mortality rates and the recent growth rates of living and dead individuals. Annual mortality rates are estimated using both survival analysis and a Bayesian approach. Growth rates are obtained from increment cores. Growth-mortality functions are fitted using two parametric approaches and a non-parametric approach. The three methods are compared using bootstrapped confidence intervals and likelihood ratio tests. For two example species, Acer rubrum and Cornus florida, growth-mortality functions indicate a substantial difference in the two species abilities to withstand slow growth. Both survival analysis and Bayesian estimates of mortality rates lead to similar growth-mortality functions, with the Bayesian approach providing a means to overcome the absence of long-term census data. In fitting growth-mortality functions, the non-parametric approach reveals that inflexibility in parametric methods can lead to errors in estimating mortality risk at low growth. We thus suggest that non-parametric fits be used as a tool for assessing parametric models.
Nitrogen transformation along an elevational and vegetative gradient from the Coweeta Hydrologic Laboratory from 1991 to 1995
Examination of N-transformation along elevation and vegetation gradient. These measurements are analysis of plant nitrogen availability and overall site productivity.
Nitrogen transformation along an elevational and vegetative gradient from the Coweeta Hydrologic Laboratory from 1991 to 1995
Examination of N-transformation along elevation and vegetation gradient. These measurements are analysis of plant nitrogen availability and overall site productivity.
Stream fish assemblage stability in a southern Appalachian stream at the Coweeta Hydrologic Laboratory from 1984 to 1995
Stream fish abundance data was collected seasonally in three 30m sections of stream from 1984 to 1995. Population estimates were obtained using electrofishing (3 pass removal). Habitat availability measurements were recorded biannually along with the electrofishing data starting in fall 1988. Data was collected each fall and spring from 1988-1995, in order to examine changes in fish assemblage structure along the habitat gradient. We used strong inference with Akaike’s Information Criterion (AIC) to assess the processes capable of explaining long-term (1984–1995) variation in the per capita rate of change of mottled sculpin (Cottus bairdi) populations in the Coweeta Creek drainage (USA). We sampled two fourth- and one fifth-order sites (BCA [uppermost], BCB, and CC [lowermost]) along a downstream gradient, and the study encompassed extensive flow variation.
Physical Attributes of the Hubbard Brook Valley Plots, 1995 - 1998 Survey Data
The valley-wide plots are a grid of 431 sites along fifteen N–S transects established at 500-m intervals spanning the entire Hubbard Brook Valley. Multiple above- and below- ground attributes were measured between 1995 and 1998. This dataset includes physical attribute data; tree inventory, soil data and other measurements are presented in separate datasets. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Soil Depth Statistics for the Hubbard Brook Valley, 1995 - 1998 Survey Data
The valley-wide plots are a grid of 431 sites along fifteen N–S transects established at 500-m intervals spanning the entire Hubbard Brook Valley. Multiple above- and below- ground attributes were measured between 1995 and 1998. This dataset includes soil depth data; tree inventory, additional soil data and other measurements are presented in separate datasets. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Tree recruitment data for the Hubbard Brook Valley Plots, baseline data collected 1995 - 1998
The valley-wide plots are a grid of 431 sites along fifteen N–S transects established at 500-m intervals spanning the entire Hubbard Brook Valley. Multiple above- and below- ground attributes were measured between 1995 and 1998. This dataset includes tree recruitment data; soil data and other measurements are presented in separate datasets. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Soil Bulk Density on the Main Cropping System Experiment. at the Kellogg Biological Station, Hickory Corners, MI (1995 to 1996)
Dataset Abstract Soil bulk density is used to convert water content by weight to water content by volume and for calculating porosity and void ratio. Bulk density has an inverse relationship with soil structure and soil porosity. Bulk density data were collected using an excavation procedure found in the sampling protocols. Bulk density data are available from the forest sites in 1995 and all sites on the LTER Central Experiment in 1996. original data source http://lter.kbs.msu.edu/datasets/29
Nitrogen in Soil Water Chemistry on the Main Cropping System Experiment at the Kellogg Biological Station, Hickory Corners, MI (1995 to 2019)
Open the record for dataset details and reuse information.
McMurdo Dry Valleys Nitrogen and Phosphorus Dynamics in Green Creek, January 1995. Field and Modeling data
McMurdo Dry Valleys, Antarctica, contain numerous glacial meltwater streams that drain into lakes on the valley floors. Many of the streams have abundant perennial mats of filamentous cyanobacteria. The algal mats grow during streamflow in the austral summer and are in a dormant freeze-dried state during the rest of the year. NO3 and soluble reactive P (SRP) concentrations were lower in streams with abundant algal mats than in streams with sparse algal mats. Here we describe and distribute the data associated with this study: An experimental injection of LiCl, NaNO3, and K3PO4 was conducted in Green Creek, which has abundant algal mats. Substantial hyporheic exchange occurred. A model in which PO4 uptake occurred only in the main channel and NO3 uptake occurred in the main channel and in the hyporheic zone. Green Creek (Gooseff, 2015) aerial flowing into Fryxell
Pocket gopher mound litter decomposition data for Saddle and East of Tvan, 1993 - 1995.
This research was designed to examine the interaction of effects of gopher disturbance and aspect on litter decomposition on alpine tundra. Kobresia myosuroides foliage collected from Niwot Ridge was dried and placed into 10x20 cm litter bags. About 2 g of plant material were placed in the litter bags. One-hundred and sixty (160) litter bags were constructed of polyester mesh with a mesh size of 2mm^2. Forty (40) litter bags were placed inside of gopher mounds, at the interface between the mounded (gopher excavated) soil and the original soil surface (top of the O horizon), located on a slope with a southern aspect. An additional 40 litter bags were placed on the soil surface near these gopher mounds. The remaining 80 bags were similarly paired on gopher mounds and undisturbed soils on a slope with a northern aspect. All litter bags were placed in the field on 1 July 1993, and an initial harvest was done on the same date in order to assess the effect of handling and transport to the field. The second harvest was undertaken on 11 September 1993, at which time 31 bags were harvested. Retrieved litter bags were dried at 80 degrees Celsius for approximately 24 hr. The litter was removed from the litter bags and weighed. Litter weight loss was calculated to estimate decomposition rates. The remaining harvests are were in autumn 1993, spring 1994, and autumn 1994.
Climate and N flux data for Saddle, 1992 - 1995.
Atmospheric gaseous nitric acid (HNO3) plus particulate matter nitrate (NO3) and ammonium (NH4) concentrations were being measured at the Saddle site on an approximately biweekly basis during the winter and on a weekly to twice-weekly basis from April through September. These N species are the dominant contributors to atmospheric N loading at the Saddle site alpine tundra. A 47-mm filter pack with a teflon front filter for NO3 and NH4 collection followed by a nylon filter for HNO3 collection is used to sample the ambient air for 3 to 6 hr. Subsequent colorimetry analysis, performed at the MRS Kiowa Laboratory, is used to obtain the mass of HNO3, NO3, and NH4 on each filter. Air concentrations are then determined by dividing masses by the volume of air sampled.
Aboveground biomass data for Saddle grid plots, 1992 - 1995 and 1997.
During the summer of 1992 10-m transects were established at each of the Niwot Ridge Saddle grid points, with the exception of grid points 1, 13, 30A, 37, 41, 42, 63, and 71. No transects were set up at those locations because they were essentially barren of vegetation or, in the case of grid point 37, were covered with a willow shrub thicket. Transect locations were chosen so that the vegetation along the transect would be consistent with that in the 1x1-m plot used to characterize the species composition at the corresponding Saddle grid point. These transects were established as part of a study designed to quantify any relationship between spectral emissivity and net primary productivity. Spectral measurements were made, using a PS-II (Analytical Spectral Devices) spectrometer (metadata in saddsrad.cw.meta.txt), of approximately 50- x 20-cm plots along a transect immediately prior to it being clip harvested for aboveground biomass determinations. Photographs were taken at the same time that the spectral measurements were made in 1994, but at different times in 1993. The photographs were subsequently used to quantify various cover classes for the harvested portion of the transect (metadata in sadpcovr.cw.meta.txt).
Deep Well Burn Line-Intercept Vegetation Transects at the Sevilleta National Wildlife Refuge, New Mexico (1995-2009)
A natural burn occurred in the Deep Well area of McKenzie Flats in June, 1995, following which studies were initiated to evaluate the effect of fire on plant species composition and the spatial and temporal dynamics of regrowth. The burn area was approximately 24 hectares, forming a swath about 200 m wide from the initial lightning-ignition source. The fire moved in a westward direction from the ignition point, leaving a relatively straight border along the southern boundary and an irregular edge along the northern boundary. The fire was extinguished naturally.One week after the burn, four 100 m line-intercept transects were established along the southern boundary of the burn. Transects were installed perpendicular to the burn, so that 50 m lay inside the burned area and 50 m outside, in unburned grassland. The first transect (nearest the road) was placed 100 m from the west end of the burn and identified as Transect A. The remaining transects (B,C,D) were located at 200 m intervals from Transect A. Rebar was placed at 0 m, 50 m, and 100 m and these points recorded with a GPS unit. Initial measurements were made in October, 1995. In subsequent years, measurements have been made in late May and late September to evaluate the response of "cool season" and "warm season" plant species. Another fire occurred on June 24, 2001. This burn only affected the unburned southern end of one transect. A prescribed burn in 2003 did not affect the transects.
Small Mammal Exclosure Study (SMES) Ant Data from Chihuahuan Desert Grassland and Shrubland at the Sevilleta National Wildlife Refuge, New Mexico (1995-2005)
Animal consumers have important roles in ecosystems, determining plant species composition and structure, regulating rates of plant production and nutrients, and altering soil structure and chemistry. This is data for numbers and species of seed harvester ant nests mapped from each of the SMES study plots. Seed harvester ant nests were mapped on each of the study plots once each year in the autumn. Ant nest maps were drawn on to pre-designed plot diagrams. Each nest was located on the diagram in reference to one of the 36 vegetation quadrat marker posts. The distance from the post, direction from the post, and species name were plotted on the map diagram. Data such as total numbers of nests of each ant species, and spatial arrangement of nests, were then taken from the diagram maps. The following question was asked: Do small mammals interact with other herbivore and granivore consumers enough to affect the species composition and abundances of other consumers such as ants?
Small Mammal Exclosure Study (SMES) Cryptogamic Crust Data from Chihuahuan Desert Grassland and Shrubland at the Sevilleta National Wildlife Refuge, New Mexico (1995-2005)
The purpose of this study is to determine whether or not the activities of small mammals regulate plant community structure, plant species diversity, and spatial vegetation patterns in Chihuahuan Desert shrublands and grasslands. What role if any do indigenous small mammal consumers have in maintaining desertified landscapes in the Chihuahuan Desert? Additionally, how do the effects of small mammals interact with changing climate to affect vegetation patterns over time? This is data for soil surface cover of cryptobiotic (cryptogam) crusts measured on each of the SMES study plots. Cryptobiotic crusts were measured from each of the 36 one-meter2 quadrats twice each year when vegetation was measured. Cryptobiotic crusts include lichens, mosses, algae, brown algae, and cyanobacteria that form crusts on stable soil surfaces.
Small Mammal Exclosure Study (SMES) Vegetation Line Intercept from Chihuahuan Desert Grassland and Shrubland at the Sevilleta National Wildlife Refuge, New Mexico (1995-2005)
The purpose of this study is to determine whether or not the activities of small mammals regulate plant community structure, plant species diversity, and spatial vegetation patterns in Chihuahuan Desert shrublands and grasslands. What role if any do indigenous small mammal consumers have in maintaining desertified landscapes in the Chihuahuan Desert? Additionally, how do the effects of small mammals interact with changing climate to affect vegetation patterns over time? This is data for perennial plant vegetation canopy cover measured from all SMES study plots, fall 1995 and fall 2005. The purpose of this data is to provide ground-truth data for comparison with low-level aerial photographs of each study plot. Three, 29 meter lines were measured along three of six rows of the permanent vegetation measurement quadrats. Each line was measured at 10cm resolution for intercepts of perennial plant live canopy cover, and for bare ground. 10cm resolution is comparable to the resolution of the aerial photos. All plants were identified to the species level. These line-intercept measurements are taken once every ten years, at the same time that low-level aerial photographs are taken. These data will be compared to both decadal air photos, and annual measures ofvegetation from one-meter2 quadrats on each plot to provide information on vegetation change over time relative to the various animal exclosure treatments.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.