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Stable carbon and nitrogen isotopes in water-extractable organic matter from air-dried soils to elucidate microbial utilization of substrate organic matter in a Japanese temperate forest

Nagano, Hirohiko*; Atarashi-Andoh, Mariko  ; Tanaka, Sota*; Koarashi, Jun   

Microbial decomposition of soil organic matter (OM) is crucial in terrestrial carbon cycle, whereas the soil analytical approach elucidating the decomposition is still halfway to the achievements. Forty air-dried soil samples were applied to water extraction and OM analysis. The C and N contents and natural abundances of $$^{13}$$C and $$^{15}$$N exhibited positive correlations between the bulk soil and water-extractable fraction. However, the C/N ratio in water-extractable fraction showed a value around 10 regardless of that in bulk soil, indicating that water-extractable OM is likely derived from microbial cells. $$^{13}$$C and $$^{15}$$N enrichments in water-extractable fraction were, respectively, negatively and positively correlated with contents of organo-mineral complexes and short-range order minerals, which control the stabilization of OM in Japanese forest soils. Those enrichments likely reflect the microbial utilization of soil C and N under different substrate availability.

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