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Department of Environment and Science Regional Ecosystem Technical Descriptions Technical descriptions provide a detailed description of the full range in structure and floristic composition of regional ecosystems (e.g. 11.3.1) and their component vegetation communities (e.g. 11.3.1a, 11.3.1b). The descriptions are compiled using site survey data from the Queensland Herbarium’s CORVEG database. Distribution maps, representative images (if available) and the pre-clearing and remnant area (hectares) of each vegetation community derived from the regional ecosystem mapping (spatial) data are included. The technical descriptions should be used in conjunction with the fields from the regional ecosystem description database (REDD) for a full description of the regional ecosystem. Quantitative site data from relatively undisturbed sites are extracted from CORVEG and summarized to provide information specific to each vegetation community. Technical descriptions include the attributes: tree canopy height and cover and native plant species composition of the predominant layer, which are used to assess the remnant status of vegetation under the Vegetation Management Act 1999. However, as technical descriptions reflect the full range in structure and floristic composition across the climatic, natural disturbance and geographic range of the regional ecosystem, local reference sites should be used where possible (Neldner et al. 2005 section 3.3.3). The technical descriptions are subject to review and are updated as additional data becomes available. When conducting a BioCondition assessment, these technical descriptions should be used in conjunction with BioCondition benchmarks for the specific regional ecosystem, or component vegetation community. Field definitions Description Description of the species, structural formation and habitat of the vegetation community (this is not the Regulation description) Area of pre-clearing regional The area of the regional ecosystem vegetation community before clearing in ecosystem hectares Area of remnant RE and percentage The area of the remnant regional ecosystem vegetation community remaining in hectares and as a percentage of pre-clearing extent Species recorded Total number; number of woody species; number in the ground layer (some species can be both woody and occur in the ground layer); average number of species per site (using only sites where a completed species list was recorded); standard deviation; number of sites used to calculate the average species number. Basal area Site average, range and standard deviation (m2/hectare) Structural Formation Percentage of sites by structural formation. For example: Woodland: 39%; open-forest: 39%; open-woodland: 22%, 23 site(s) Representative CORVEG sites Site (id) numbers used in the description For each stratum present: • Emergent (E) • Height - average canopy height in metres, range in metres and number of sites values are based on. • Canopy (T1), Sub-canopy (T2) and Low tree layers (T3) • Cover - Average percentage canopy cover of the layer, range and • Shrub (S1) and Sub-shrub number of sites values are based on. layers (S2) • Average stem density (stems per hectare), range and number of • Ground (G) sites values are based on. Dominant species (relative cover, Relative cover (mean of cover of species / total cover of all species in that frequency): stratum for all values > zero) and frequency (percent of total sites) ordered by decreasing relative abundance. Up to five most dominant species with frequency > 20% listed for each stratum. For example: Abutilon albescens (78, 46%), means this species occurs in 46% of all sites and when it occurs comprises 78% of total cover (of the stratum) Frequent species (cover, frequency): Frequent species: Cover (mean of all values > zero) and frequency (percent of total sites) of all species occurring in more than 5% of sites ordered by decreasing frequency. For example: Abutilon albescens (10, 46%), means this species occurs in 46% of all sites and when it occurs has a mean cover of 10% Ground layer species are listed as either graminoid or forbs. Naturalised species have an asterisk (*) after the scientific name. indet. after listed name = indeterminate species or genus Department of Environment and Science Conditions of use Technical descriptions have been developed from information published by the State of Queensland (acting through the Department) and remain the property of the State of Queensland. Technical descriptions are not to be included on internet sites other than the Queensland Government website. Users should reference information contained in the technical descriptions as: Pollock, A.B. (ed.) (year*) Technical Descriptions of Regional Ecosystems of the Brigalow Belt North, (month, year*) (Queensland Herbarium, Department of Environment and Science: Brisbane). * Date shown in footnote of individual descriptions. While every effort has been made to ensure the information presented is as reliable as possible, the State of Queensland accepts no liability and gives no assurance in respect of its accuracy and shall not be liable for any loss or damage arising from its use. Technical descriptions are based on a combination of quantitative and qualitative information and should be used as a guide only. Technical descriptions are not to be used as a substitute for reference sites. Descriptions are subject to review and are updated as additional data becomes available. For more information, contact: Queensland Herbarium, Science Delivery Brisbane Botanic Gardens, Mt Coot-tha Mt Coot-tha Road Toowong Qld 4066 Australia Phone: (07) 3896 9326 [email protected] Technical Description Regional ecosystem: 11.7.1 Acacia harpophylla and/or Casuarina cristata and Eucalyptus thozetiana or E. microcarpa woodland on lower scarp slopes on Cainozoic lateritic duricrust Michael Michael Herring Pre-clearing area (ha), remnant area (ha) and per cent remaining: 200,684 77,974 39% Species_recorded: Total: 115; woody: 44; ground: 84; Avg. spp./site: 33.3; std dev.: 5.3, 4 site(s) Basal area: Avg./site: 10.8 m²/ha, range: 5.0 - 15 m²/ha, std. deviation: 4 m²/ha, 7 site(s) Structural formation: Woodland: 71%; open-woodland: 29%, 7 site(s) Representative_sites 16831, 17025, 17153, 17576, 28867, 28876, 28939. Stratum: Tree 1 Height avg. = 18.6m, range 10-25m, 7 sites Crown cover avg. = 30.0%, range 18.0-50.0%, 7 sites Dominant species (relative cover, frequency): Eucalyptus thozetiana (81, 100%), Casuarina cristata (61, 29%) Frequent species (cover, frequency): Eucalyptus thozetiana (19, 100%), Casuarina cristata (13, 29%), Acacia harpophylla (2, 14%), Acacia rhodoxylon (14%), Everistia vacciniifolia (14%), Geijera parviflora (14%) Stratum: Tree 2 Height avg. = 9.5m, range 4.5-16m, 6 sites Crown cover avg. = 18.2%, range 3.0-40.0%, 6 sites Dominant species (relative cover, frequency): Eremophila mitchellii (66, 43%), Eucalyptus thozetiana (52, 29%) Frequent species (cover, frequency): Eremophila mitchellii (11, 43%), Eucalyptus thozetiana (29%), Acacia harpophylla (40, 14%), Acacia rhodoxylon (3, 14%), Acacia shirleyi (1, 14%), Atalaya hemiglauca (14%), Casuarina cristata (14%), Ehretia membranifolia (14%), Geijera parviflora (1, 14%), Owenia acidula (14%) Stratum: Tree 3 Height avg. = 3.0m, 1 site Crown cover avg. = 1.0%, 1 site Frequent species (cover, frequency): Croton insularis (1, 14%) Dominant species: Relative cover (mean of cover of species / total cover of all species in that stratum for all values > zero) and frequency (percent of total sites) ordered by decreasing relative abundance. Up to five most dominant species with frequency > 20% listed for each stratum, (only comprehensive sites used for ground stratum). Frequent species: Cover (mean of all values > zero) and frequency (percent of total sites) of all species occurring in more than 5% of sites ordered by decreasing frequency. Ground layer species % (of comprehensive sites) are listed as either graminoid or forb. Naturalised species have an asterisk (*) after the name. indet. after listed name = indeterminate species or genus 1/03/2018 Technical Description Regional ecosystem: 11.7.1 Stratum: Shrub 1 Height avg. = 2.1m, range 1.2-3m, 6 sites Crown cover avg. = 21.4%, range 5.0-60.0%, 6 sites Dominant species (relative cover, frequency): Carissa ovata (52, 57%), Erythroxylum australe (28, 29%), Geijera parviflora (19, 29%), Ehretia membranifolia (9, 29%), Eremophila mitchellii (8, 29%) Frequent species (cover, frequency): Carissa ovata (12, 57%), Capparis lasiantha (43%), Jasminum didymum subsp. lineare (43%), Abutilon oxycarpum (29%), Ehretia membranifolia (3, 29%), Eremophila mitchellii (2, 29%), Erythroxylum australe (10, 29%), Geijera parviflora (10, 29%), Notelaea microcarpa (29%), Opuntia tomentosa* (29%), Psydrax odorata (1, 29%), Abutilon calliphyllum (14%), Acacia harpophylla (1, 14%), Acacia rhodoxylon (1, 14%), Acacia shirleyi (3, 14%), Alectryon diversifolius (14%), Alphitonia excelsa (1, 14%), Apophyllum anomalum (14%), Capparis mitchellii (1, 14%), Cassia brewsteri (1, 14%), Croton insularis (3, 14%), Cynanchum viminale subsp. brunonianum (14%), Dodonaea triangularis (14%), Dodonaea viscosa subsp. burmanniana (1, 14%), Elaeodendron australe (1, 14%), Erythroxylum sp. (Splityard Creek L.Pedley 5360) (1, 14%), Everistia vacciniifolia (5, 14%), Hovea longipes (1, 14%), Parsonsia lanceolata (14%), Petalostigma pubescens (5, 14%), Psydrax forsteri (5, 14%), Rhagodia spinescens (2, 14%), Salsola australis (14%), Sclerolaena birchii (14%),
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