GEOMORPHOLOGY REPORT - CRC LEME
GEOMORPHOLOGY REPORT - CRC LEME GEOMORPHOLOGY REPORT - CRC LEME
6.2 EC and pH 6.2.1 Methodology Soil electrical conductivities were measured to determine the conductivity, salt content and salt load of the surface materials within 30 cm of the surface. Conductivity also provided a measure of soil development in landform units of different ages. Measuring pH quantitatively provides a cross check on field determinations and another way of determining soil evolution in differently aged landform units. Measuring salinity and pH in soil was carried out using the 1:5 method. With this method, 10ml of distilled water is placed in a measuring container and small soil particles added until the volume of the contents of the container increased by 5ml to bring the volume to 15ml. Additional water is then added to bring the total volume to 30ml. the sample is shaken intermittently for five minutes and allow it to settle for five minutes. EC and pH probes are dipped into the solution and readings taken. 6.2.2 Results The measured EC values ranged between 0.036 and 4.4 dS/m, with the majority (all but seven) falling below 1.0 dS/m. There is no good trend between conductivity and geomorphic unit relatively high conductivities (>1.0) are found in units Fs, Fm1, Fm3, and T. However, the terrace (T) units are on average more saline than those of the floodplain and uplands. Measured pH values range between 4.45 and 9.45, with the majority of the samples being acidic. There is a clear trend between increasing age of geomorphic unit and increasing pH. The youngest geomorphic units are almost entirely acidic, including almost all examples of unit Fm1. Soils from the terrace unit and uplands are near neutral to alkaline ( 17
Table 2). Mean pH and EC profiles are shown in Figure 11 and Figure , respectively. pH was lowest in the Fm1 unit at all depths, and increased with increasing age of floodplain units. This may be due to leaching of base cations as a result of the sandier textures of the Fm1 unit. The Uplands had the highest pH at all depths. EC was highly variable within each geomorphic unit and between geomorphic units (Figure 3). However, the Terrace unit showed the highest EC at all depths. 0 pH 1:5 3 4 5 6 7 8 9 Depth (m) 0.1 0.2 Fm1 Fm2 Fm3 T U 0.3 Figure 11. Mean pH profiles from each geomorphic unit. Note: horizontal bars indicate the standard error or the mean. 0 EC 1:5 (dS/m) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Depth (m) 0.1 0.2 0.3 Fm1 Fm2 Fm3 T U Figure 18. Mean EC profiles from each geomorphic unit. Note: horizontal bars indicate the standard error of the mean. 18
- Page 1 and 2: CRCLEME Cooperative Research Centre
- Page 3 and 4: This report (CRC LEME Open File Rep
- Page 5 and 6: Lindsay and Wallpolla Creeks are si
- Page 7 and 8: TABLE OF CONTENTS _Toc224538156 1 I
- Page 9 and 10: List of Tables Table 1. Association
- Page 11 and 12: The main objective of the studies r
- Page 13 and 14: 4. Identification of the high recha
- Page 15 and 16: The SRTM was used as to provide the
- Page 17 and 18: Figure 6. Compartmentalisation of t
- Page 19 and 20: Dune on terrace Alluvial terrace Yo
- Page 21 and 22: Intermediate floodplain Modern floo
- Page 23 and 24: Locations of sample sites are given
- Page 25: 6.1 Granulometry 6.1.1 Methodology
- Page 29 and 30: when sampling. This is also reflect
- Page 31 and 32: Figure 12. SPOT image of Wallpolla
- Page 33 and 34: REFERENCES Bowler, J.M. and Harford
- Page 35 and 36: APPENDIX 1. ASTER data and interpre
- Page 37 and 38: APPENDIX 2. SPOT Data and interpret
- Page 39 and 40: APPENDIX 3. DEM data and interpreta
- Page 41 and 42: APPENDIX 4. Gamma-ray data 500000 (
- Page 43 and 44: APPENDIX 6. Site Descriptions and D
- Page 45 and 46: Site 3 South Settlement road, ~20 m
- Page 47 and 48: Site 5 Western end of Keera Road, s
- Page 49 and 50: Site 7 Eastern end of Old Mail Rd t
- Page 51 and 52: Site 12 Further to west along Old M
- Page 53 and 54: Site 14 Dedmens drive, across aband
- Page 55 and 56: Site 16 Same area as previous sampl
- Page 57 and 58: Site 18 Same location as 17, interm
- Page 59 and 60: Site 20 Adjacent to previous site C
- Page 61 and 62: Site 22 2 km east of Finnegans brid
- Page 64 and 65: APPENDIX 7: Analytical Results Appe
- Page 66 and 67: Appendix 7.2: Lindsay-Wallpolla Las
- Page 68 and 69: Appendix 7.3: Lindsay-Wallpolla XRF
- Page 70 and 71: 16 200709 1929587 20-30 Fm1 7 0.611
- Page 72 and 73: Site Number Depth LEME ID Sample #
Table 2).<br />
Mean pH and EC profiles are shown in Figure 11 and Figure , respectively. pH was lowest in<br />
the Fm1 unit at all depths, and increased with increasing age of floodplain units. This may be<br />
due to leaching of base cations as a result of the sandier textures of the Fm1 unit. The Uplands<br />
had the highest pH at all depths. EC was highly variable within each geomorphic unit and<br />
between geomorphic units (Figure 3). However, the Terrace unit showed the highest EC at all<br />
depths.<br />
0<br />
pH 1:5<br />
3 4 5 6 7 8 9<br />
Depth (m)<br />
0.1<br />
0.2<br />
Fm1<br />
Fm2<br />
Fm3<br />
T<br />
U<br />
0.3<br />
Figure 11. Mean pH profiles from each geomorphic unit. Note: horizontal bars indicate the<br />
standard error or the mean.<br />
0<br />
EC 1:5 (dS/m)<br />
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0<br />
Depth (m)<br />
0.1<br />
0.2<br />
0.3<br />
Fm1<br />
Fm2<br />
Fm3<br />
T<br />
U<br />
Figure 18. Mean EC profiles from each geomorphic unit. Note: horizontal bars indicate the<br />
standard error of the mean.<br />
18
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