Calwynyardah land system (Clw), size: 1736km2, publication source: wky


Chestnut land system (Cht), size: 520km2, publication source: WKY



Yüklə 11,73 Mb.
səhifə5/7
tarix27.08.2017
ölçüsü11,73 Mb.
1   2   3   4   5   6   7

Chestnut land system (Cht), size: 520km2, publication source: WKY


Restricted stable floodplains above the level of the active floodplains, sandy to loamy reddish soils with soft spinifex grasslands with scattered trees.

there are scattered areas of chestnut land system about 50 km south of fitzroy crossing .

Location map showing coverage of Chestnut land system defined by black region.



State land type: Alluvial and sandy plains with soft spinifex grasslands.

Geology: Quaternary alluvium.

Geomorphology: Alluvial plains - stable floodplains: plains up to 9m above active floodplains; with marginal, stony erosional slopes; surface drainage absent except for minor ill-defined floors with shallow channels.

Land management: Soft spinifex pastures are moderately attractive to cattle for a few years following fire; old stands are unattractive. Generally low susceptibility to erosion; control of grazing pressure and frequency of burning desirable.

landscape picture of flat plain with spinifex grasses and many termite mounds

Image of broad plains with soft spinifex (Triodia pungens) grasslands and numerous termite mounds are characteristic of the Chestnut land system. Photo: Andrew McLaughlin DAFWA 1998



aerial view of the location of land units drawn to scale.

Stylised plan diagram showing arrangement of land units for the Chestnut land system (numbers on diagram represent land units in table below)

Table of Chestnut land system – land units. * Numbers in brackets refer to soil family or vegetation community/alliance in ‘General report on lands of the West Kimberley area, WA’ (Speck et al. 1970); + Pasture types described in Appendix 1; Note: Proportions and occurrence of pasture types within land units are subject to change over time due to invasion by native and introduced species, seasonal conditions, fire frequency and grazing management.

Unit

Approx.
area
(%)

Landforms

Soils*

Vegetation*

Pasture type+

1

88

Plains: up to 16km in extent locally with drainage floors up to 90m wide: lightly firmed sandy surfaces with pebble patches; gradients less than 1 in 200.

Mainly reddish loamy soils: Tippera family (2). Some reddish sandy soils: Yabbagoddy family (1).

Soft spinifex grassland and very open woodlands with Triodia pungens and
T. bitextura
. Communities 55, 8b, 8c and locally 34b, 20.

SSPP

2

12

Erosional slopes: pebble-strewn concave slopes, up to 2%; minor structural benches.

Mainly reddish sandy soils: Yabbagoddy family (1). Some reddish skeletal soil and outcrop (24).

Spinifex grassland with very scattered, stunted trees and shrubs. Triodia intermedia community (57).

HSPP

close up landscape picture of scattered soft spinifex pastures

Image of soft Spinifex Pastures (SSPP) dominated by soft spinifex (Triodia pungens). Photos: Bob McCartney, DAFWA.



close up picture of two curly spinifex plants

Image of less commonly curly spinifex (Triodia bitextura) is the main pasture type on Chestnut land system. Photos: Simon Eyres, DAFWA.


Clifton land system (Clf), size: 606km2, publication source: WKY


Sandstone plateaux with deep valleys, low open woodlands with curly spinifex.

there are scattered areas of clifton land system about 150 km north and north east of fitzroy crossing.

Location map showing coverage of Clifton land system defined by black region.



State land type: Hills, ranges and plateaux with eucalypt woodlands and spinifex.

Geology: Subhorizontal sandstone and shale of Upper Proterozoic age.

Geomorphology: Formed by dissection of the Kimberley surface - plateaux and mountain ranges: rocky plateaux up to 22.5km in extent, with high escarpments and restricted lower slopes; moderately dense, branching pattern of narrow, incised valleys; relief up to 305 m.

Land management: A rugged and inaccessible system of no value for pastoralism, inherently resistant to erosion, high scenic amenity.

landscape picture of flat plain in foreground and in distance a mountain range

Image of Mount House, an isolated range and plateau of the Clifton land system, standing above surrounding plains of the Glenroy land system. Photo: DAFWA



landscape block diagram of sandstone and shale base with location of different land units drawn to scale.

Stylised block diagram showing location of land units for the Clifton land system (numbers on diagram represent land units in table below)



Table of Clifton land system – land units. * Numbers in brackets refer to soil family or vegetation community/alliance in ‘General report on lands of the West Kimberley area, WA’ (Speck et al. 1970); + Pasture types described in Appendix 1; Note: Proportions and occurrence of pasture types within land units are subject to change over time due to invasion by native and introduced species, seasonal conditions, fire frequency and grazing management.

Unit

Approx.
area
(%)

Landforms

Soils*

Vegetation*

Pasture type+

1

7

Summit remnants: up to 4.8km in extent; sandy slopes less than 1% with laterite exposures locally.

Mainly deep red sands: Cockatoo family (7). Some deep brown sands; Kalyeeda family (9) and minor laterite

Open woodland with scattered shrubs and Triodia bitextura (4, 6). Locally 3 and 28.

CAHP

2

70

Rocky plateaux: gently sloping or undulating, with relief up to 15m and slopes up to 5%; indented escarpments to 305m with vertical upper walls and steep slopes and with basal scree slopes up to 45%.

Mainly outcrop with some reddish loamy skeletal soil (24).

As for unit 1.

CAHP

3

9

Lower slopes: concave up to 5% and up to 1.6km long; dissected up to 9m into spurs with flat or gently sloping crests up to 180m wide and marginal slopes up to 60%; mantled with colluvium.

Reddish loamy and clayey lithic soils: Yabbagoddy (1, 23) and Tippera (2, 23) families.

Open woodland with scattered shrubs and Triodia bitextura, Eucalyptus brevifolia, Corymbia cadophora community (3).

CSPP

4

2

Boulder fans: up to 270m long, slopes up to 30%.

Bouldery, medium-textured skeletal soils (24).

Soft spinifex grassland with scattered trees and shrubs, Triodia bitextura community (54).

CAHP

5

4

Alluvial drainage floors: up to 550m wide, gradients 1 in 200 to 1 in 300; marginal slopes up to 25%.

Gravels, with locally developed greyish sands over tough loamy subsoils: Tarraji family (18).

Open woodland with Triodia bitextura, Chrysopogon spp. ground storeys. Adansonia gregorii alliance (31).

CSPP 50%
RGRP 50%

6

8

Channels: up to 30m wide and 4.5m deep.

Bed-loads range from sand to boulders.

Fringing forests and woodlands. E. camaldulensis, Terminalia platyphylla fringing community (42).

FRIP

null

An aerial oblique photo of a main occurrence of Clifton land system showing the indented plateau landform bounded by escarpments. Photo: Geerten van Gelder (alias Geerten, Panoramio.com)




Yüklə 11,73 Mb.

Dostları ilə paylaş:
1   2   3   4   5   6   7




Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©azkurs.org 2020
rəhbərliyinə müraciət

    Ana səhifə