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Summer droughts projected to increase in central Europe due to climatechanges strongly influence the carbon cycle of ecosystems. Persistentrespiration activities during drought periods are responsible for asignificant carbon loss, which may turn the ecosystem from a sink into asource of carbon. There are still gaps in our knowledge regarding thecharacteristic changes taking place in the respiration of the differentcomponents of the ecosystem in response to drought events. In the present study, we combined a physical separation of soil respirationcomponents with continuous measurements of soil CO2 efflux and itsisotopic (13C) signals at a dry grassland site in Hungary. The physicalseparation of soil respiration components was performed by means of inoxmeshes and tubes inserted into the soil. The root-excluded and root- andmycorrhiza-excluded treatments served to measure the isotopic signals of therhizospheric, mycorrhizal fungi and heterotrophic components, respectively. In the dry grassland investigated in the study the three components of thesoil CO2 efflux decreased at different rates under drought conditions.During drought the contribution made by the heterotrophic components was thehighest (54 ± 8 %; mean ±SE). Rhizospheric component was themost sensitive to soil drying with its relative contribution to the totalsoil respiration dropping from 66 ± 7 (non-stressed) to 35 ± 17 %(mean ±SE) under drought conditions. According to our resultsthe heterotrophic component of soil respiration is the major contributor tothe respiration activities during drought events in the dry grasslandecosystem studied

Autotrophic component of soil respiration is repressed by drought more than the heterotrophic one in dry grasslands