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3 results for “north of Tvan”
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).
Pocket gopher esker-krummholz distance data for Martinelli slope and North of Tvan, 1995.
Two ares of Niwot Ridge were examined for simultaneous occurrences of krummholz and eskers created by Thomomys talpoides (Northern pocket gopher) burrowing, to establish a relationship between snowpack and gopher habitat. The krummholz east and northeast of the Martinelli slope and the krummholz north of T-van were surveyed for the abundance of gopher eskers. Using a tape measure, the minimum and maximum distances of the eskers from the krummholz vegetation were measured, with a value of 0 m indicating that the nearest soil core was immediately adjacent to or actually underlying a branch of the tree. With the use of a compass, both the northernmost and southernmost bearings were measured from the krummholz to the esker. The krummholz were tagged at the northeasternmost point whenever possible for consistency, or the northernmost branches of the leeward side of the tree island. All measurements were taken from the nearest protruberance of the krummholz.
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.
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