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The Change of the carbon isotopic ratio in the CO$$_{2}$$ derived from soil organic matter decomposition over the incubation time

Moriya, Koichi*; Moriizumi, Jun*; Yamazawa, Hiromi*; Koarashi, Jun; Atarashi-Andoh, Mariko

To understand the decomposition mechanism in the soil, we researched the relationship between compositions of SOM and CO$$_{2}$$ derived from SOM decomposition (SOMD-CO$$_{2}$$) by using $$^{13}$$C and $$^{14}$$C. With the soil incubation, we measured CO$$_{2}$$ production rates of soil and carbon isotopic ratios in SOMD-CO$$_{2}$$. The CO$$_{2}$$ production rates decreased rapidly at the beginning of incubation, and then decreased slowly. On the other hand, $$delta$$$$^{13}$$C$$_{rm SOMD-CO2}$$ before incubation was larger than $$delta$$$$^{13}$$C$$_{rm SOM}$$. After 40-70 days of incubation, $$delta$$$$^{13}$$C$$_{rm SOMD-CO2}$$ became smaller than $$delta$$$$^{13}$$C$$_{rm SOM}$$, and then $$delta$$$$^{13}$$C$$_{rm SOMD-CO2}$$ after 120-170 days approached $$delta$$$$^{13}$$C$$_{rm SOM}$$. We consider these results as follows. SOM is composed of three components, rapidly decomposable SOM that has large $$delta$$$$^{13}$$C, slowly decomposable SOM that has small $$delta$$$$^{13}$$C and passive SOM that has the same value as $$delta$$$$^{13}$$C$$_{rm SOM}$$. With the progress of soil decomposition, the dominant component in SOMD-CO$$_{2}$$ changed. Therefore, $$delta$$$$^{13}$$C$$_{rm SOMD-CO2}$$ changed too.



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