ZLV Online

Abstrakt

Douglas-fir and Norway spruce influence on the soil characteristics and humus accumulation in middle (altitude 410 m) mature stands (99 years) was evaluated. For both species, soil characteristics such as acidity, sorption complex, quantitative characteristics of humus profile and amount of total and available nutrients were compared. The holorganic horizons acidity was significantly lower (by 0.75 pH) as well as exchangeable H+ and Al3+ ions content (two times lower) in Douglas-fir stand compared with spruce stand. More favorable conditions of qualitative soil sorption complex characteristics were also confirmed in Douglas-fir stand, with significantly higher base saturation and total base content (both characteristics exhibited two times higher values). The upper organic horizon differed significantly in available calcium, magnesium potassium and phosphorus contents as the higher values were found in Douglas-fir stands. Total nutrients content differed only in the case of calcium with higher values in Douglas-fir stand. In the study area, positive effect of Douglas-fir on the soil characteristics compared with Norway spruce was found.