GEOMORPHOLOGY REPORT - CRC LEME

5.2.3 Floodplain
Vegetation on the modern floodplain consists of River Red Gum (E. camaldulensis) open
forest or woodland (Figure 5). The intermediate floodplain has Black Box (E. largiflorens)
woodland or low open woodland (Figure 6), while the oldest floodplain has Saltbush-Lignum
(Muehlenbeckia florulenta) shrubland and Black Box savannah (Figure 7).
River Red Gum low open woodland or woodland occurs along most water courses, with
Black Box woodland along smaller, drier courses. Riparian vegetation consists of macroalgae,
water lilies and bull rushes in slower flowing or stagnant water (Figure 7).
Figure 6. Modern floodplain (right) with well developed river red gum forest. Intermediate
floodplain (left) with black box woodland, Lindsay-Wallpolla and Lake Victoria-Darling
Anabranch reach.
Figure 7. Oldest floodplain (left) with black box and Lignum-saltbush savannah. Riparian
vegetation (right) of bulrushes, lilies, and macroalgae, Horseshoe Lagoon, Lindsay – Wallpolla
reach.
Correlations between vegetation, geomorphic unit, and surface materials are shown in
Table 1.
6 ANALYTICAL DATA
16 soil pits were excavated to a depth of 30 cm and sampled at 10 cm intervals in the survey
area. No samples were taken from the northern boundary to Wakool Junction section of this
survey area as units were similar to those already described in the Robinvale-Liparoo,
Lindsay-Walpolla, and Robinvale-Boundary Bend reaches (Clarke et al. 2007a, b. c). The
new geomorphic units mapped south of Wakool Junction were extensively sampled, with a
minimum of five sites from each unit. The soil pits provided qualitative data on the soil
profiles in each unit, shown in Appendix 6. Analytical results are contained in Appendix 7.
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