A major objective of our research was to survey sudoil biological activity and organic matterudcontent reduction in a Central European oak forestudduring treatments of various detritus inputs withinudtheudSíkfudőudkút DIRT (udDetritus Input and Removal Treatmentsud) Project. Beside the control, three detritusudremoval and two detritus duplication treatments werude applied. Our examinations have proven that soiludorganic matter content declined relatively fast inuddetritus removal treatments. The reduction wasudespecially remarkable in root detritus removal treaudtments, where – due to the lack of transpiration –udsoilsudwere moister during the whole year than in the otheudr treatments. The higher moisture content, despiteudofudthe reduction of detritus input, produced an intensude soil respiration. This can be explained by the faudct thatuddecomposing organisms have increased the use of soiudl organic matter. Detritus input reduction had audsignificantly greater effect on soil respiration anudd organic matter content than detritus input duplicudationudof the same extent. The latter did not cause any siudgnificant change compared to the control.
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