Part VI
Total contents of Ca, Cu, Fe, K, Mg, Na, and Zn in soil samples were determined with an ICP spectrometer (Liberty 220, Varian, USA) after digestion with HF and HNO3 in a microwave oven (Ethos 900, Milestone, Italy) according to Jones et al. (1991). Exchangeable cations were extracted from the 2002 samples with 1 mol l-1 ammonium acetate with pH regulated to 7 and determined with Liberty 220. pH and ash content of the soil samples collected from P8B19 and P3B3 and their adjacent forests were determined using a suspension of soil sample with distilled water mixed at 1:2.5 (w:v) and by the combustion method, respectively.
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