ASH98 (plot 1)

Site: ASH98 (Plot1)

Land Unit: Dundas Redgum

General Land Unit Description:
The flat surface of the Dundas Tablelands predominantly consists of Brown Chromosols and to a lesser extent Yellow Chromosols with a ferric horizon, typically occurring above the clay subsoil. The soil is commonly developed over a highly weathered mottled zone. This red and white mottling, sometimes referred to as ‘tiger mottles’, is thought to be the result of deep chemical weathering which occurred during the late Tertiary period. Red gums are the dominant vegetation found on this surface.

2.5 year old Eucalyptus globulus plantation on ex-agricultural land

Site Description:

Geology: Cainozoic duricrust	Landform pattern: Undulating plain
Position in landscape: Lower slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-15 cm	Very dark greyish brown (10YR3/2) loam; weak polyhedral structure (20-50 mm) parting to weak granular structure (5-10 mm); weak consistence when dry; few medium ferruginous nodules; common very fine macropores; areal porosity 0.3%; many medium roots; clear and smooth transition to:
A1	15-28 cm	Dark brown (10YR4/3) loam; unable to assess structure of consistency due to the presence of very many segregations; dry; very many coarse ferruginous nodules; common very fine roots; sharp and smooth transition to:
Subsoil
B21	28-60 cm	Yellowish brown (10YR5/6) with common medium distinct reddish brown (5YR5/5) mottles, light medium clay; strong polyhedral structure (10-20 mm) parting to strong granular structure (5-10 mm); firm consistence when moderately moist; very few medium ferruginous segregations; few very fine macropores; areal porosity 0.05%; few very fine roots; diffuse and smooth transition to:
B22	60-100 cm	Yellowish brown (10YR5/6) with many coarse prominent red (2.5YR4/8), red (2.5YR4/6) and yellow (10YR7/8) mottles, light medium clay; moderate polyhedral structure (20-50 mm) parting to weak polyhedral structure (10-20 mm); firm consistence when moderately moist; few very fine macropores; areal porosity 0.03%; no roots observed; diffuse and smooth transition to:
B23	100-150 cm	Yellowish brown (10YR6/2) with many coarse prominent brownish yellow (10YR6/6) and red (2.5YR4/8) mottles, light medium clay; strong polyhedral structure (20-50 mm) parting to moderate polyhedral structure (10-20 mm); firm consistence when moderately moist; few very fine macropores; areal porosity 0.03%; no roots observed.
	150-250 cm	Similar to layer above.
	250-400 cm	Fine sandy light clays and silty clays (grey, red, orange), no calcium carbonate observed.

Sampled by: Ian Sargeant, Paul Feikema and Martin Clark (6 December 2000)

Page top