DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report Eucalyptus coolabah (coolibah) woodlands Eucalyptus coolabah woodlands are common on clay soils in areas subject to flooding in the north, becoming mixed with Eucalyptus largiflorens in similar habitats in the south. Other tree and shrub species are uncommon, but include Eucalyptus camaldulensis, Eremophila bignoniiflora, Casuarina cristata, Acacia stenophylla, Atalaya hemiglauca, Capparis lasiantha and Exocarpos aphyllus. The groundcovers are similar to those in Eucalyptus largiflorens communities. In the Bogan-Macquarie and Castlereagh-Barwon provinces Eucalyptus coolabah can be associated with Acacia pendula (myall) Muehlenbeckia florulenta and Acacia farnesiana (mimosa bush). Chenopodium auricomum (golden goosefoot) is associated with this community in the Culgoa-Bokhara province. Species associated with this community vary with topography. For example, Muehlenbeckia florulenta occurs in wetter areas and Casuarina cristata and Acacia pendula are found on the higher level floodplains. On the floodplains of the Culgoa and Narran Rivers, Eucalyptus coolabah is found as closed and open forest, woodland and open woodland with tree canopy height ranging from six to 15 m and canopy cover from five to 70%. Eucalyptus coolabah is found with varying densities of Acacia stenophylla, Eucalyptus camaldulensis, Eucalyptus largiflorens and Eucalyptus populnea subsp. bimbil. Common shrub species are Muehlenbeckia florulenta, Eremophila bignoniiflora, Eremophila sturtii, Myoporum montanum (western boobialla), Geijera parviflora and Alstonia constricta (quinine bush). Groundcover species include Paspalidium jubiflorum, Cyperus concinnus (trim sedge), Eleocharis pallens (pale spike-rush) and Muehlenbeckia florulenta. Eucalyptus camaldulensis (river red gum) open forests and woodlands These communities predominantly occur as ribbons along rivers, swamps, billabongs and ephemeral sandy creeks. They are widely distributed across western New South Wales and can be grouped as open forests, woodlands and open woodlands with canopy trees up to 20 m in height and a canopy cover of 40 to 50%. In addition to Eucalyptus camaldulensis, tree and shrub species can include Eucalyptus largiflorens, Eucalyptus coolabah, Eucalyptus melliodora (yellow box), Corymbia tessellaris (carbeen), Acacia stenophylla, Acacia salicina, Acacia oswaldii and Muehlenbeckia florulenta and ground cover frequently contains grasses, sedges, forbs and some low shrubs such as Enchylaena tomentosa and Chenopodium spp. Common shrub species on the northern floodplains include Nicotiana glauca (wild tobacco), Swainsona greyana (darling pea), Eremophila longifolia (emu bush), Eremophila bignoniiflora, Eremophila mitchelli and Muehlenbeckia florulenta, and groundcover Myriocephalus sturtii (poached eggs), Enneapogon avenaceus (common bottle washers), Capparis lasiantha and Marsilea drummondii. Eucalyptus melanophloia (silver-leaf ironbark) woodlands These woodlands typically occur in the north of the region on skeletal soils of gravelly to stony ridges, and on deep red sandy earths on sandplains. Associated tree and shrub species can include Acacia aneura, Grevillea juncifolia (honeysuckle spider flower), Hakea spp., Acacia excelsa, Alstonia constricta, Brachychiton populneus, Ventilago viminalis, Geijera parviflora, Capparis lasiantha and Callitris glaucophylla. Corymbia tessellaris can co-occur on the higher coarser soils and with Corymbia dolichocarpa (bloodwood) on sandy soils in 72
16/08/02 Darling Riverine Plains Bioregion Background Report the east of the Castlereagh-Barwon province and with Corymbia terminalis (western bloodwood) and Acacia aneura in the coarser, shallower soils of the Narran-Lightning Ridge province. Perennial grasses dominate the groundcover, with Triodia mitchellii var. breviloba (buck spinifex) common in the north, and Monachather paradoxa, Eragrostis eriopoda (woolybutt) and others prominent elsewhere. Geijera parviflora (wilga) - Flindersia maculosa (leopardwood) woodlands This community is mostly restricted to the Bogan-Macquarie area, occurring on red-brown earths that are often scalded and on low gently undulating rises away from the main watercourses. Communities can vary from being monotypic stands of either species to a mixture. Other species include Atalaya hemiglauca, Eremophila mitchellii, Capparis mitchellii (native orange), Apophyllum anomalum, Eucalyptus populnea subsp. bimbil (on higher areas) and occasional Callitris glaucophylla, Alectryon oleifolius Eucalyptus microcarpa (grey box) and Eucalyptus blakelyi (Blakley’s red gum) in the south. Understorey includes saltbushes and Sclerolaena spp. (copper burrs). This community can intergrade with the Eucalyptus largiflorens community on plains with shallow depressions and channels and Eucalyptus populnea subsp. bimbil on the higher slopes. On the low rises of the Culgoa-Bokhara province Geijera parviflora, Flindersia maculosa, Apophyllum anomalum and Acacia cambagei occur together. Acacia pendula (myall) woodlands These occur as open to dense woodlands on clay and clay loam textured soils of the river floodplains. Casuarina cristata, Acacia stenophylla, Acacia oswaldii, Senna artemisioides ssp. circinnata (spring-pod cassia), Capparis lasiantha, Acacia victoriae, Acacia homalophylla and Alectryon oleifolius may also occur with the Acacia pendula. The groundcover species include saltbushes, grasses and forbs such as Sclerolaena spp.. Acacia harpophylla (brigalow) woodlands Monotypic stands of Acacia harpophylla form on red clays and red earths with sandy clay loam topsoils. Shrubs are rare to absent, and the groundcover consists of saltbushes, Sclerolaena spp. and annual forbs. This shrubland is found in the north of the bioregion and in lower parts of the landscape can mix with the species of the Flindersia maculata and Geijera parviflora community in the Castlereagh-Barwon province. 3.3.2 Shrublands Tall Acacia Shrublands Acacia loderi (nelia) shrublands This community exists on sandy calcareous red earths and sandy accumulations on broad plains of solonised brown soils in the west of the region. Associated trees include Acacia aneura in the north and Casuarina cristata in the south. Shrubs include Maireana sedifolia (pearl bluebush), Templetonia egena (desert broombush), Eremophila sturtii and Senna form taxon ‘filifolia’ (punty bush). Saltbush Shrublands This community is widely distributed across western New South Wales as forblands, open chenopod shrublands, chenopod shrublands and sparse shrublands. Common shrubs include 73
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DARLING RIVERINE PLAINS BIOREGION B
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For more information data contact t
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3.2 Vegetation Mapping and Descript
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10 APPENDICES 166 A CLIMATIC DATA B
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List of Maps Chapter 1 Map 1 Locati
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PROJECT SUMMARY This report forms p
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abbits are listed as key threatenin
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16/08/02 Darling Riverine Plains Bi
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Initial Phase Assessment Phase 16/0
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Appendix A: Mean Monthly Rainfall a
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Major Rangetype Rangetype Physiogra
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Appendix C : Native Flora Other Tha
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Family Scientific Name Common Name
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Family Scientific Name cretica Comm
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APPENDIX E: Fauna Other than Those
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Common 1983 1984 1985 1986 1987 198
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Taxa No Records Dataset Class Arach
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Taxa No Records Dataset Family Hebr
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Taxa No Records Dataset Tabanidae s
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Taxa No Records Dataset Berosus sp
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