Summary
Abstract Aims As the major carbon sources of soil respiration (R s ) include the soil organic carbon content (SOC) and the belowground carbon allocation, we aimed to reveal their relative effects on actual CO 2 efflux from soil. Methods We measured soil respiration and additional variables in a dry grassland site in Hungary in the same spatial grid (78 points, 0.63 ha) during 23 campaigns over nine years. We used gross primary productivity (GPP) as a proxy for belowground carbon allocation, derived from eddy-covariance measurements and downscaled to the corresponding measuring positions. To visualize the multidimensional data, principal component analysis was performed. To describe the partial effects of the measured variables, general additive models (GAMs) were fitted. Results GPP was fo
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