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.