Carbon isotopic composition of soil respired CO (soil δC) has been regarded as a good indicator of the linkages between aboveground processes and soil respiration. However, whether δC of autotrophic or heterotrophic component of soil respiration dominates the temporal variability of total soil δC was rarely examined by previous studies. In this study, carbon isotopic composition of atmospheric CO (δC) and soil δC in control (with roots) and trenched (without roots) plots were measured in a temperated mixed forest. A C isotopic profile system and an automated soil respiration system were used for δ C and soil δC measurements, respectively. We found that soil δC in the control plots changed substantially in the growing season and it was more negative (by ~0.6‰) than that in the trenched plots, while soil δC in the trenched plots showed a minor temporal variability. This suggests that δC from the autotrophic respiration is the key decider of the seasonal variation pattern of the soil δC. Moreover, the seasonal variation of soil δC in the control plots showed a similar pattern with the seasonal variation of δC. A significant time-lag was found between δC and soil δC, showing that soil δC generally lagged behind δC 15 days. This result supports the hypothesis that soil respiration is closely related to carbon assimilation at the leaf-level and also stressed the importance of δC in shaping soil δC. These findings are highly valuable to develop the process-based models of the carbon cycle of forest ecosystems.
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