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Seasonal patterns and control factors of CO$$_{2}$$ effluxes from surface litter, soil organic carbon, and root-derived carbon estimated using radiocarbon signatures

Atarashi-Andoh, Mariko ; Koarashi, Jun  ; Ishizuka, Shigehiro*; Hirai, Keizo*

Radiocarbon ($$^{14}$$C) signature was used to partition soil respiration in a cool-temperate deciduous forest. Heterotrophic respiration strongly correlated with soil temperature, but the magnitude of the response to soil temperature was different between SOC decomposition and litter decomposition. Autotrophic respiration appeared to correlate strongly with the phenology index rather than soil temperature. The information on the seasonal change about the contribution ratio of each source to the soil respiration is essential to understand the intrinsic temperature sensitivity of each source and the other factors controlling soil respiration.



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