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Additional file 1 Description of Land Use Capability Units in the study area (National Water and Soil
Conservation Organisation, 1975)
Unit
Unit description
Slope group
Surface geology
Present erosion
Potential erosion
IIs
River flats and terraces with free
A
Alluvium from volcanic ash
Slight stream bank.
Slight stream bank.
draining soils
and weathered greywacke,
andesite and rhyolite.
IIIe
Tephra covered, undulating to
Ash and lapilli over
Slight sheet and rill
Moderate sheet and
easy rolling slopes on volcanic
B/C
weathered volcanic rocks
when cultivated.
rill when cultivated.
rocks and dissected river
and pumiceous sand.
terraces.
Alluvium and terrace
Weathered andesite and
Slight sheet, wind
Slight sheet, wind
volcanic ash. Weathered
and rill. Slight soil
and rill. Slight soil
iron sands.
slip.
slip.
deposits from volcanis ash
and volcanic rocks.
VIe2
Strongly rolling hill country and
D
stable dunes of low fertility
VIe3
VIe8
Strongly rolling to moderately
Complex of volcanic ash
Slight tunnel gully
Slight tunnel gully
steep hills with tephra mantling
and weathered andesite,
and soil slip
and soil slip
the rolling tops and valley
rhyolite, ignimbrite and
bottoms.
greywacke.
Weathered greywacke and
Moderate sheet,
Moderate sheet,
andesite.
wind and soil slip
wind and soil slip
Weathered greywacke and
Moderate soil slip
Moderate soil slip
andesite
and sheet
and sheet
Weathered basic andesite
Moderate to severe
Moderate to severe
rolling to moderately steep hills
sheet, wind and soil
sheet, wind and soil
of very low fertility and poor
slip.
slip.
Moderately steep to steep hill
D/E
E
country with a low natural
fertility and poor soil structure.
VIe10
Steep hills of weathered
F
greywacke and andesite of low
fertility and poor soil structure.
VIe11
Deeply weathered, strongly
soil structure.
D/E
VIIe2
VIIe7
VIIe8
Steep, low fertility andesitic hill
Moderate to severe
Severe sheet, wind
country and mountain lands.
sheet, wind soil slip
soil slip and debris
Slopes are long with many
and debris
avalanche.
bluffs.
avalanche.
Deeply weathered, moderately
F
Very severe sheet,
Severe sheet, wind,
steep to steep hill country of
wind, soil slip and
soil slip and earth
very low fertility.
earth slip
slip
Weathered greywacke and
Severe debris
Very severe debris
andesite.
avalanche and scree
avalanche and scree
Weathered ignimbrite and
Severe debris
Very severe debris
rhyolite
avalanche, soil slip
avalanche, soil slip
and sheet
and sheet
Very steep and steep long
E/F
Weathered andesite
G/F
mountain slopes of the main
Weathered basic andesite
axial ranges.
VIIe9
Steep and very steep mountain
land with many exposed bluffs
and rhyolite domes
G and F