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The aim of this study was to investigate the cessation of cultivation act as a sink or source for belowground carbon pools in former paddy fields. We measured soil carbon content and stable carbon isotopic ratio (d 13 C) in three abandoned agricultural fields in Higashi-Hiroshima, Japan. The fields were located within 0.20 km of one another and had been abandoned for 2, 5, or 10 years (2Y, 5Y, 10Y fields). The cessation of cultivation of agricultural fields was dominated by C4 photosyntheticdoi:10.2480/agrmet.64.4.2 fatcat:7quyuxkchnbnxcvk7jmfx6gdia