slopes are moderately to highly susceptible to erosion; control of grazing pressure is essential. Images showing most of the Richenda land system is poorly accessible rough hills, but a few drainage floors and lower slopes support preferentially grazed perennial tussock grasses under scattered eucalypts. Photos: Noel Schoknecht, DAFWA Stylised block diagram showing location of land units for the Richenda land system (numbers on diagram represent land units in table below) Table of Richenda land system land units. * Numbers in brackets refer to soil family – or vegetation community/alliance in on lands of the West Kimberley ‘General report area, (Speck et al. 1970); + Pasture types described in Appendix 1; Note: WA’ 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. Approx. Pasture Unit area Landforms Soils* Vegetation* type+ (%) Rocky hillslopes: benched slopes on Mainly gneiss and schist, outcrop with up to 70%, locally limited areas Low open vertical, with basal of shallow, woodland. CAHP 80% 1 66 scree slopes up to reddish, Communities 3, HSHP 20% 35%; convex rocky sandy 8a, 14a, 16, 32. slopes on granite, skeletal soils up to 80%, locally (24). with joint-block cappings. Mainly outcrop with Open grassy Lower slopes: shallow, woodlands with concave, up to sandy Triodia bitextura, 10%, mainly less skeletal soils Chrysopogon spp., than 400m long but (24). Minor and Sehima CAHP 50% up to 1.6km long; occurrences 2 24 nervosum - WGBP outcrop and cobble of greyish to Sorghum spp. 50% mantles in upper brownish ground storeys. parts, colluvial sands and Eucalyptus tectifica mantles in lower loams over alliance (14a, 14b, sectors. tough clays: 14c). Jurgurra family (19). Drainage floors: Loamy Very open grassy 3 3 WGBP up to 365m wide, alluvial soils: woodland with
slopes are moderately to highly susceptible to erosion; control of grazing pressure is essential. Images showing most of the Richenda land system is poorly accessible rough hills, but a few drainage floors and lower slopes support preferentially grazed perennial tussock grasses under scattered eucalypts. Photos: Noel Schoknecht, DAFWA Stylised block diagram showing location of land units for the Richenda land system (numbers on diagram represent land units in table below) Table of Richenda 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 66 Rocky hillslopes: benched slopes on gneiss and schist, up to 70%, locally vertical, with basal scree slopes up to 35%; convex rocky slopes on granite, up to 80%, locally with joint-block cappings. Mainly outcrop with limited areas of shallow, reddish, sandy skeletal soils (24). Low open woodland. Communities 3, 8a, 14a, 16, 32. CAHP 80% HSHP 20% 2 24 Lower slopes: concave, up to 10%, mainly less than 400m long but up to 1.6km long; outcrop and cobble mantles in upper parts, colluvial mantles in lower sectors. Mainly outcrop with shallow, sandy skeletal soils (24). Minor occurrences of greyish to brownish sands and loams over tough clays: Jurgurra family (19). Open grassy woodlands with Triodia bitextura, Chrysopogon spp., and Sehima nervosum - Sorghum spp. ground storeys. Eucalyptus tectifica alliance (14a, 14b, 14c). CAHP 50% WGBP 50% 3 3 Drainage floors: up to 365m wide, Loamy alluvial soils: Very open grassy woodland with WGBP