an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
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Table 6.6. Carbon content <strong>of</strong> soils <strong>of</strong> the study area.<br />
Sample No. Total carbon;<br />
Ctotal (%)<br />
Org<strong>an</strong>ic carbon;<br />
Corg<strong>an</strong>ic (%)<br />
Inorg<strong>an</strong>ic carbon;<br />
Cdiff. (%)<br />
SA1-30cm 1,16 1,04 0,12<br />
SA1-50cm 1,48 0,81 0,67<br />
SA2-70cm 0,50 0,46 0,04<br />
Black <strong>clays</strong> SA2-105cm 0,96 0,22 0,74<br />
SA41-50cm 1,14 1,02 0,12<br />
SB1-50cm 1,13 1,00 0,13<br />
SB1-70cm 1,19 1,08 0,11<br />
SB42-30cm 1,34 1,19 0,15<br />
SB42-50cm 1,30 1,17 0,13<br />
SC17-50cm 1,29 1,08 0,21<br />
SC33-30cm 1,39 1,19 0,20<br />
Rd1-30cm 2,47 1,90 0,57<br />
Red soils Rd1-100cm 0,73 0,54 0,19<br />
Rd1-200cm 0,83 0,61 0,22<br />
Rd1-400cm 0,45 0,35 0,10<br />
6.6.3 Analysis <strong>of</strong> results<br />
The variation <strong>of</strong> carbon content <strong>of</strong> soils with depth, Dp, is represented diagrammatically in<br />
Figures 6.11, 6.12 <strong>an</strong>d 6.13.<br />
Red soils: carbon content/ depth<br />
3,00<br />
carbon (%)<br />
2,50<br />
2,00<br />
1,50<br />
1,00<br />
0,50<br />
Ctotal = 1,0356Dp -0,6115<br />
R 2 = 0,8831<br />
Corg = 0,7821Dp -0,6116<br />
R 2 = 0,8766<br />
total carbon<br />
org<strong>an</strong>ic carbon<br />
inorg<strong>an</strong>ic carbon<br />
Potential (total carbon)<br />
Potential (org<strong>an</strong>ic<br />
carbon)<br />
Potential (inorg<strong>an</strong>ic<br />
carbon)<br />
Cdiff = 0,2526Dp -0,6128<br />
0,00<br />
R 2 = 0,8871<br />
0,00 1,00 2,00 3,00 4,00 5,00<br />
depth Dp (m)<br />
Figure 6.11. Variation <strong>of</strong> carbon content <strong>of</strong> red soils with depth.