Corg, Nt, Pt and Porg in mineral soil
There were no significant differences in Pt contents in mineral soil under the studied tree species (Table 4). However, the soil under Scots pine had lower concentration of Corg (37.7 mg g-1); Nt (1.38 mg g-1) and Porg (149.7 µg g-1) than the soils under all remaining tree species (46.1 mg g-1 – 49.7 mg g-1 for Corg, 2.00 mg g-1 – 2.66 mg g-1 for Nt and 206.9 µg g-1 – 211.9 µg g-1 for Porg) (Table 4). Tree species did not affect soil Corg-to-Porg ratio. The Nt-to-Porg ratio was the largest under black locust (12.7) but the difference was significant only compared with Scots pine (8.5).
The contents of Corg, Nt, Pt, Porg as well as Corg-to-Porg ratio depended on substrate type. The lowest contents of these elements were measured in Sands and the highest in Clays (although for Pt the difference between Clays and Ashes was not significant). The Corg-to-Porg ratio was the lowest in Sands and the largest in Clays (Table 4). However, there was no effect of substrate type on Nt-to-Porg ratio.