650

Site number:

650

Authors:

IBC, GGC

Date recorded:

1991/12/09

Reason Sampled:

Leaching experiment using lithium chloride tracer to determine rate of leaching

Description:

Approximately 350m northwest of the western end of Scott Base on a gently sloping step on a minor ridge, about 50m north of the Scott Base to McMurdo Station walking track; a generally bouldery surface; at this site, 4 contiguous 1m X 1m plots were set out and 3 irrigated with LiCl, the 4th (southernmost) with H2O; this was the second plot resampling series; the site is 3m from the edge of the application plot

Altitude:

60 m

Aspect:

E

Slope:

2 °

Climate

Soil climate zone:

Coastal Antarctic

Estimated mean annual temperature:

-18 °C

Frozen ground depth:

30 cm

Frozen type:

Hard ice-cemented

Frozen comment:

30

Geology

Geological setting:

Rocks are predominantly scoria flows of the McMurdo Volcanics; Last Glaciation Ross 1 ice covered the site and traces of rocks (sandstone and granite granules and small pebbles) probably from the Royal Society Range can be found; the drift mantle is thin and patchy with bedrock a little below the surface

Patterned ground:

Weakly developed small nets with distinct borders

Surface weathering or surface features:

Carbonate coatings on undersides of surface clasts; some thin patchy salt precipitations

Soil

Soil parent material:

Bouldery till and slope detritus with minor accessions of sedimentary and granitic rocks

Previous disturbance:

Probably minor treading

Soil weathering stage:

1 (Campbell & Claridge 1975)

Soil moisture status:

Oceanic subxerous; a dry site with little snow accumulation or water activity

Biological activity:

Some local yellow lichen and small moss occurrences