DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report 4 FLORA 4.1 AVAILABLE INFORMATION 4.1.1 Sources of data Plant species records from the DRP have been extracted from the databases of the Royal Botanic Gardens (NSW), National Herbarium, NPWS Wildlife Atlas and other vegetation surveys within the DRP. Other herbaria may also have plant records from the DRP but this information will be obtained as part of the DRP vegetation mapping, biodiversity survey and conservation assessment projects. Threatened species under the TSC Act, Schedule 13 species listed under the National Parks and Wildlife Act, 1974 (NSW), and ROTAP (Rare and Threatened Australian Plants) species were taken from the complete list. The provenance, distribution of the remaining plant species and most recent common names were determined from Harden (1990-94) and exotic species were then removed from this list and placed in a separate database. Records of questionable accuracy or those species not described by Harden were further investigated using the Royal Botanic Gardens Plants of NSW Database. Distribution and current common names were checked. Species still considered or a questionable reliability were deleted from the list. Separate lists of historical records (pre-1970) and extinct flora were also created. Systematic surveys Only a limited number of systematic floristic surveys have been conducted in the DRP and these are listed in Table 4.1 Not all of these surveys have full floristic sampling or precise location information (such as AMG reference) and some of the studies included sites from outside the DRP. 86
16/08/02 Darling Riverine Plains Bioregion Background Report Table 4.1 Summary of floristic surveys conducted within the DRP Dataset Site selection Survey methods No. Survey period Full author & date sites floristic Natural Vegetation of the Stratified - based on API, 20x20m, 530 Oct 1991-Feb Yes Southern Wheatbelt replications within each cover/abundance, 1992 (Sivertsen & Metcalfe 1995) veg type, no private land geomorphology, structure veg Vegetation of Wombeira Land Stratified - based on API, 3 20x40m, 65 30/10/90 – Yes System replications within each cover/abundance, 10/11/90 (Dick 1993) veg type geomorphology, structure veg Floristic Description of Sites stratified on 20x20m, 152 20/2/99 – 8/5/99 Yes Grasslands of the Moree vegetation types cover/abundance, & 12/7/99 – Plains geomorphology, veg 10/8/99 (Hunter & Earl 1999) structure Natural Resources Study – Sites geographically 30 x 30m, 272 2/9/96 – 31/1/97 Yes Murray-Darling action plan spread cover/abundance, (Centre of Environmental geomorphology, veg Management 1998) structure Vegetation survey of riparian 3 03/10/95 - zones within the Namoi River 16/05/96 catchment, north-west New South Wales (Beckers 1996) Macquarie Marshes 20 x 20m, 251 01/04/92 - Vegetation Mapping (Wilson 1992) cover/abundance 30/10/92 Vegetation Mapping of the Sites selected randomly 20 x 20m, cover / 90 9/96 – 11/96 Yes Lower Macquarie Floodplain abundance, (Steenbeeke 1996) geomorphology The survey by Dick (1993) of the vegetation of the Wombeira land system on the floodplains of the Culgoa, Birrie and Narran Rivers in northern NSW is one of the more intensive surveys undertaken to date in the DRP. This was a quadrat-based survey with structural and floristic data collected from sixty-five sites. 4.1.2 Plant species diversity of the DRP A total of 1 129 plant taxa (species, subspecies and varieties) have been recorded from the DRP. Native species are listed in Appendix C and the 229 exotic plant species are listed Appendix D. Plant species records in the Wildlife Atlas are unevenly distributed across the bioregion (Map 26) (NPWS 1999c). On a coarse scale (1:100 000 mapsheets), much of the eastern section of the DRP has a relatively moderate number of records (101-1000) compared with other regions in NSW. The southern portion of the arm of the DRP along the Darling River has few records. The mapsheet of the Culgoa floodplain contains the greatest number of records in the DRP. The survey by Dick (1993) recorded 175 plant species, with the species richness per 20x40 m quadrat ranging from an average of 25.3 species on parts of the floodplain without channels to 20 species in the channels and 19 species on slight rises. With the inclusion of previous records a total of 230 species is known from the Wombeira landsystem (Dick 1993). The families Asteraceae, Chenopodiaceae and Poaceae contributed the largest number of species 87
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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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ainfall (mm) 900 800 700 600 500 40
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Appendix A: Mean Monthly Rainfall a
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80 70 60 50 40 30 20 10 0 25 20 15
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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 Name Scientific Name No Reco
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Common 1983 1984 1985 1986 1987 198
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Common Name 1983 1984 1985 1986 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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DARLING RIVERINE PLAINS BIOREGION Background Report

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