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Effect of dry-wet cycles on carbon dioxide release from two different volcanic ash soils in a Japanese temperate forest

Nagano, Hirohiko   ; Atarashi-Andoh, Mariko  ; Koarashi, Jun   

In the present study, two volcanic ash soils (soil A and B) from a temperate broad-leaved forest in eastern Japan were incubated under repeated dry-wet cycles and continuously constant moisture conditions. The primary aims were to quantify the potential for enhancement of carbon dioxide (CO$$_{2}$$) release owing to increased water fluctuation and to examine differences in the responses of volcanic ash soils with different physicochemical properties. Soil B, rather than soil A, was a typical Andosol. During incubation at 20 $$^{circ}$$C for 120 days with five dry-wet cycles, the CO$$_{2}$$ release rate was measured periodically. Abundance of the stable carbon isotope in CO$$_{2}$$ ($$delta^{13}$$C-CO$$_{2}$$) was measured to capture changes in the origin of decomposed soil organic matter (SOM) owing to the dry-wet cycles. The CO$$_{2}$$ release rate under the dry-wet cycles was up to 49% higher than the values predicted from a parabolic relationship between CO$$_{2}$$ release and water content during incubation under the continuously constant moisture condition. The magnitude of CO$$_{2}$$ release enhancement was 2.7-fold higher in soil B relative to that in soil A. The $$delta^{13}$$C-CO$$_{2}$$ value in the dry-wet cycles was enriched by 0.3-2.3%$$_{0}$$ compared to that during incubation under the continuously constant moisture conditions, suggesting that the decomposition of old and/or well-metabolized SOM was enhanced by the dry-wet cycles. Thus, the present study suggests that Andosols, which have been believed to have a strong SOM stabilization ability, are vulnerable to dry-wet cycles. Then, increased water fluctuation in a future warmer world would have significant potential to stimulate CO$$_{2}$$ release from soils.

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