Territory Stories

Bioregions of the nt



Bioregions of the nt


Kerle, J. A.


E-Publications; E-Books; PublicationNT; 176




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Technical Report LRD94100 Viewed at 07:02:32 on 18/02/2010 Page 102 of 275. 3.0 Introduction A vegetation and land unit survey of Gregory National Park (the Park) was undertaken in 19911992. In the interim period, an amalgamation of all land units in the VRD has taken place. A listing 01 the land units contained in this report and their equivalent VRD regional land units will be found in section 3.4. when this information becomes available. A land unit map is contained at the end of this report. 3.1 Methods 3.1.1 Site data Vegetation data was obtained lrom a 20 metre by 20 metre II0ristic quadrant. Soil sample sites occurred within or adjacent to the fioristic site. Full species list were compiled and percentage abundance recorded. Percentage canopy cover and height 01 each stratum was also recorded. Basal area of dominant overstorey species was recorded. Environmental and soil data was also recorded. Site data was collected from 260 sample sites located in all regions of the Park. 3.1.2 Mapping Black and white 1:80 000 scale aerial photographs were used for interpreting the land unit boundaries. Topography and soils were the main discriminator used to delineate land units. The - boundaries were transferred from the photos to 1: 1 00 000 topographic maps. A geographically correct draft map was then drawn on clear overlay and these were scanned into ARC/INFO Geographic Information Sysy1em (GIS). The land unit map is complete. Landsat 1 :100 000 TM imagery was also interpreted to determine vegetation boundaries. These boundaries have been digitised into ARC/lNFO GIS. The coverage needs to be labelled however. 3.1.3 Classification system The classification used for landform and vegetation descriptions of each land unit follow the conventions in the "Australian Soil and Land Survey Field Handbook" McDonald et al (1984). 3.2 Land Unit Descriptions A brief description of Bach land unit and associat9ct vegetation follows. Only the dominant or most prevalent vegetation is described for each land un~. More detail on the relationships between land units, landform and dominantvegetation commun~ies is contained in section 4. A full description of each vegetation commun~ is contained in section 5. All communities found in a particular land un~, based on location of the s~es are listed. Order of listing is numeric and does not reflect the relative importance of each community. Further species or communities, observed during field survey, are included in the associated vegetation types. Land unit la Area: 461 km' Main geology: Paj,Ti Distribution: Found on low lying plateau and plains in the south and westem regions of the Bullita section of the Park, including Kildurk and Whickham River regions. Soils are siliceous sands or lithosols. Rock outcropping is generally absent, although it may reach 35% in some areas. Main vegetation type: Eucalyptus dichromophloia/Eucalyptus fe"uginea midhigh woodland to open-woodland with Plectrachne pungens hummock grassland. Great Soil Group: Lithosols 1

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