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8 results for “north of saddle”
Increased temperature, N and snowpack experiment for north of saddle, 2006 - ongoing.
In 2006 we established a global change experiment in the Front Range of the Rocky Mountains to investigate how manipulations of warmer summer temperature, N deposition, and increased snowpack would affect the growth of alpine plants. The experiment was implemented on Niwot Ridge, where shrub cover has expanded by over 400% since 1946 (Formica et al. 2014). We established experimental plots north of the Niwot Ridge saddle, in an area of moist meadow tundra where willow shrub (Salix sp.) patches are present. Within experimental plots, Salix glauca seedlings were transplanted in 2006 and 2007 to test whether changing environmental conditions facilitated shrub survival and growth. In 2007 and 2008, phenological observations were recorded for all (2007) or abundant (2008) species in experimental plots. Measurements of plant species composition and aboveground net primary productivity (ANPP) are also made annually or biennially (ANPP, 2017-onward). In 2021, canopy height and NDVI began being measured annually. In July of 2016, a community transplant experiment was implemented to test whether changing environmental conditions support changes in alpine tundra plant communities. Two species characteristic of (1) dry meadow tundra (Tetraneuris acaulis, Erigeron pinnatisectus), (2) snowbed tundra (Ranunculus adoneus, Saxifraga rhomboidea) and (3) subalpine meadow (Trollius albiflorus, Polemonium pulcherrimum) were transplanted into experimental plots. Survival and growth of transplants was documented annually through 2021.
Geum and Kobresia soil inorganic and organic property data for Saddle and North of Tvan, 1993.
This study was initiated to examine bulk density and organic matter content differences between soils where Geum (Acomastylis) rossii and Kobresia myosuroides were present. A subset of samples were also measured for total C, N, and P. Paired plots were randomly selected in locations where Kobresia and Geum populations were adjacent to one another. Soil samples were collected from 35 plots, 22 and 13 of which had southerly and northerly aspects, respectively. Soil cores were removed with 3.5-cm interior diameter PVC pipe that was driven into the tundra by use of a rubber mallet. The minimum depth of individual cores was 9 cm, and these depths were recorded at the time of removal (15 July, 19 July, 22 July, and 9 August 1993).
Alpine tundra and krummholz soil temperature data for Saddle and North of Tvan, 1994 - 1999.
Growing season soil temperatures (typically at 2 depths in a given location) were measured (1) to quantify the soil temperature environment across the landscape mosaic of alpine tundra, and (2) to compare temperatures between tundra and adjacent krummholz vegetation. Measurements were made at sites differing in aspect (south-facing and north-facing) and moisture conditions (dry, mesic, and wet). In addition, soil temperature was measured at a site characterized by persistent snow cover, as well as at sites within and adjacent to a krummholz patch. Data are presently collected using an Omnidata DP212 datapod.
N fertilization experiment plant species composition data for north of the saddle from 2011 to ongoing, yearly
In August 2010, N fertilization plots were established over a gradient of Geum rossii (Aco) and Deschampsia caespitosa (Des) cover in an area of moist-wet meadow alpine tundra north of the Saddle on Niwot Ridge. A total of 20 plots were set up, with 1X-10X being control plots where no nitrogen (N) was added, and 1N-10N being fertilization plots where N was added. Control and fertilized plots were paired so that pairs had the same percent cover of Aco and Des. Initially in 2010, N addition plots were fertilized at a rate of 28.8 g N x m^2 x yr^-1 (72 g of slow-release Osmocote (40-0-0)). In 2011 fertilization rate was reduced to N x m^2 x yr^-1 (25 g Osmocote (2011-2013), Duration Urea 120, 40-0-0, SGN 150 (2014-on).
Soil and microbial N data for Saddle, South of saddle, North of saddle, 1993.
Gross N mineralization, respiration, and microbial biomass N were measured using soil from dry, moist, and wet meadow sites on Niwot Ridge at 3 times during the year: immediately following snowmelt, at approximately peak plant biomass, and following aboveground senescence. Microbial biomass N was measured on replicate soil cores from plots of each community, using the chloroform fumigation-extraction technique. Those cores were subsequently composited and subsamples were incubated at 15 degrees Celsius in the laboratory for measurement of CO2 evolution and 15N pool dilution-based estimations of gross mineralization.
Fine root biomass and N content data for Saddle, South of saddle, North of saddle, 1994.
Root production was estimated in dry, moist, and wet meadow communities on Niwot Ridge using a root-ingrowth core method. Columns of root-free soil were established on 1 June 1994 and were re-cored on 10 August and 23 September 1994 for measurement of fine root mass and nitrogen content.
Soil and microbial N data for Saddle, South of saddle, and North of saddle, 1991 - 1992.
Net nitrogen mineralization, nitrification, and microbial nitrogen were measured in dry, moist, and wet meadow plots in 3 different locations on Niwot Ridge: a south-facing slope in the Boulder watershed, across the Saddle, and a north-facing slope. Measurements were made on a monthly basis while soils were unfrozen and once over the period of frozen soil conditions. Associated soil measurements included moisture, temperature, organic N and C, total P, and texture.
Plant biomass and N content data for Saddle, South of saddle, North of saddle, 1992.
Plant biomass and nitrogen content were measured in dry, moist, and wet meadow sites on Niwot Ridge at 3 times during the year: immediately following snowmelt, at approximately peak biomass, and following aboveground senescence. Live and dead materials of both above- and belowground plant fractions were collected.
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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
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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
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