To evaluate the small-scale (100 m²) spatial variability of selected soil biological properties in a beech stand and the influence of soil properties on soil microbial activity, we collected soil samples on April 2, July 2 and October 30 (2002) from three (9 ¥ 10 m) plots, distributed on a 1 ¥ 1 m grid, from the top 10 cm of the mineral soil (A horizon). In soil samples, soil respiration and catalase activity were measured. Within-plot coefficients of variation of catalase activity varied from 19 to 23%, those of soil respiration rate ranged from 37 to 54%. Catalase activity exhibited highly significant correlations with soil reaction, whereas soil respiration rate correlated with moisture and humus content. Soil respiration rates appear to be randomly distributed over the sampling area. On the other hand, catalase activity exhibits a rather distinct patchy structure. No relationships between the position of trees and soil respiration rates were found. For catalase activities, the highest values were observed on transsections of perimeters of dominant-tree crowns.
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