Regional ecosystem details for 2.3.69
| Regional ecosystem | 2.3.69 |
|---|---|
| Vegetation Management Act class | Least concern |
| Wetlands | Not a Wetland |
| Biodiversity status | Of concern |
| Subregion | 2, 8, 3, 7, (1.3), (1.4), (5), (1), (4.5) |
| Estimated extent1 | Pre-clearing 150000 ha; Remnant 2021 150000 ha |
| Short description | Dichanthium spp., Iseilema spp., Aristida spp. and Brachyachne convergens in mixed tussock grasslands on active Quaternary alluvial deposits derived from coarse-grained parent material in the west |
| Structure code | Tussock Grassland |
| Description | Mixed tussock grassland, including combinations of the species Dichanthium spp., Iseilema spp., Aristida spp., Brachyachne convergens, Eriachne spp. and Chrysopogon fallax. Occasional species include Sporobolus spp., Chloris spp. and Fimbristylis dichotoma. Emergent Atalaya hemiglauca, Eucalyptus microtheca, E. pruinosa, Corymbia spp. and Excoecaria parvifolia may occur. A seasonally variable ecosystem with a combination of annual and perennial tussock grasses. Occurs on active Quaternary alluvial deposits derived from coarse-grained parent material in the west of the bioregion. Red to brown silty loams and clays. Not a Wetland. (BVG1M: 31a). Vegetation communities in this regional ecosystem include: 2.3.69a: Mixed tussock grassland, including combinations of the species Dichanthium spp., Aristida spp., Eriachne spp. and Chrysopogon fallax. Occasional species include Sporobolus spp., Chloris spp. and Fimbristylis dichotoma. Emergent Atalaya hemiglauca, Eucalyptus microtheca, E. pruinosa, Corymbia spp. and Excoecaria parvifolia may occur. Occurs on active Quaternary alluvial deposits derived from coarse-grained parent material in the west of the bioregion. Brown silty loams and clays. Not a Wetland. (BVG1M: 31a). 2.3.69b: Mixed tussock grassland, including combinations of the species Iseilema spp., Brachyachne convergens, Sporobolus spp. and Dactyloctenium radulans. Emergent Eucalyptus microtheca, Lysiphyllum cunninghamii, Atalaya hemiglauca, Acacia cambagei and Grevillea striata may occur. Occurs on levees and minor active Quaternary alluvial plains derived from coarse-grained parent material in the south of the bioregion. Red to brown sandy loams to silty clays. Not a Wetland. (BVG1M: 31a). |
| Protected areas | Lawn Hill (Widdallion) RR, Lawn Hill (Creek) RR |
| Fire management guidelines | SEASON: March to April, with occasional storm burns if woody weeds are a problem. INTENSITY: Low, occasionally moderate and high intensities. INTERVAL: 3-6 years south of latitudes below Karumba, 1-3 years to the north. INTERVAL_MIN: 1. INTERVAL_MAX: 6. STRATEGY: Do not actively target burning of sedgelands. Commence burning early in dry season to break up continuity of fuel across the landscape. Mosaic burning across the landscape at varying frequency will create patches at varying stages of post-fire response. Burn with good soil moisture to promote regeneration. ISSUES: Retaining grasslands by preventing woody thickening may be an issue in some situations. A long absence of fire or low intensity fire too early in the season may lead to overabundant seedlings and saplings. Invasive and high biomass grasses (e.g., buffel, Para and grader grasses) may increase fire severity to the detriment of these ecosystems. |
| Comments | 2.3.69: Subject to degradation from high total grazing pressure. 2.3.69a: Was previously mapped as 2.3.20x1a, 2.3.20x1b and 2.3.20x1c. Subject to degradation from high total grazing pressure. 2.3.69b: Was previously mapped as 2.3.18x2a, 2.3.18x2b and 2.3.18x2c. Subject to degradation from high total grazing pressure. |
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.
