Research Article
Humus and Humic Acids of Luvisol and Cambisol of Jiguli Ridges, Samara Region, Russia
Table 2
The groups of HAs in soils: Percentage of humic acid carbon to total C content.
| | Horizon | Forms of HAs | | Free | Ca-connected | Clay-connected |
| | Cambisol |
| | A | 4.0 | 7.8 | 7.8 | | AB | 2.9 | 9.8 | 5.9 | | BW | 5.9 | 5.9 | 11.8 |
| | Rendzic leptosol related to cambisol |
| | A | 10.4 | 5.3 | 10.7 |
| | Luvisol |
| | A | 2.8 | 8.9 | 6.3 | | BEL | 1.0 | 16.0 | 8.0 | | BT | 2.0 | 35.0 | 26.0 |
| | Rendzic leptosol related to luvisol |
| | A | 1.6 | 18.6 | 11.1 |
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