Regional ecosystem details for 6.9.2
| Regional ecosystem | 6.9.2 |
|---|---|
| Vegetation Management Act class | Least concern |
| Wetlands | Not a Wetland |
| Biodiversity status | No concern at present |
| Subregion | 10 |
| Estimated extent1 | Pre-clearing 58000 ha; Remnant 2021 58000 ha |
| Short description | Acacia tephrina +/- A. cambagei low open woodland on undulating plains over Cretaceous sediments |
| Structure code | Low Open Woodland |
| Description | Acacia tephrina predominates and with A. cambagei forms a distinct but discontinuous upper layer. A. tephrina occasionally occurs in pure stands. Scattered low shrubs are present, but a low shrubby layer does not form. Astrebla spp. usually dominate the ground layer, but other short grasses and forbs occur. Occurs on gently undulating to undulating plains with convex slopes (slopes 1-3 %). Soils mantle developed from fresh sediments of the Cretaceous Winton formation. Silcrete stone covered is derived from erosion of the Tertiary land surface. Associated soils are deep to very deep, self-mulching, stone covered, red and brown clays. Soils are predominantly alkaline throughout, but on those soils where gidgee predominates they may become acid with depth. CaCo3 concretions are found in the surface soil and gypsum is usually present below 45cm and gradually increases with depth. A weak gilgai microrelief. Thin easily broken surface crusts may form on this soil. Textures are medium to heavy clays. Not a Wetland. (BVG1M: 26a). Vegetation communities in this regional ecosystem include: 6.9.2x40: Acacia tephrina woodland, commonly with A. cambagei. Astrebla spp. usually dominate the ground layer. Other ground layer species include Sclerolaena spp., Sporobolus spp. and Enneapogon polyphyllus. Occurs on undulating, gravelly, old alluvial clay deposits in the west of the bioregion. Red-brown clays with surface gravel and cobble. Not a Wetland. (BVG1M: 27a). |
| Supplementary description | Dawson (1974), G4 (LU 74); Neldner (1984), 46 (122) |
| Special values | 6.9.2: Potential habitat for NCA listed species: Eremophila stenophylla. 6.9.2x40: Potential habitat for NCA listed species: Eremophila stenophylla. |
| Fire management guidelines | SEASON: Various (wet season or winter). INTENSITY: Low to moderate. INTERVAL: Fire return interval not relevant. INTERVAL_MIN: 100. INTERVAL_MAX: 100. STRATEGY: Aim to exclude fire by fuel reduction in adjacent vegetation communities where possible. Undertake partial burns when necessary to reduce fuel loads and protect against severe wildfire. Burn with high soil moisture (i.e., after rain/storms) or in winter. ISSUES: Some Acacias can be fire sensitive (A. shirleyi, A. aneura) and may be killed by high intensity fire. There is rarely enough fuel load to burn in these ecosystems. |
| Comments | 6.9.2: This regional ecosystem has been moved to 6.9.2x40. Poor regeneration of Acacia tephrina possibly due to high total grazing pressure. 6.9.2x40: Poor regeneration of Acacia tephrina possibly due to high total grazing pressure. Very poor regeneration of Astrebla, probably due to over-grazing over long periods. |
1 Estimated extent is from version 13.1 pre-clearing and 2021 remnant regional ecosystem mapping. Figures are rounded for simplicity. For more precise estimates, including breakdowns by tenure and other themes see remnant vegetation in Queensland.
