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BACKGROUND: Organic substrates and calcium are important factors controlling organic matter turnover in Karst soils. To understand their effects on soil organic carbon (SOC) mineralization, an incubation experiment was conducted involving a control treatment (CK), the addition of a 14C‐labeled rice straw (T1), CaCO3 (T2), and both 14C‐labeled rice straw and CaCO3 (T3) to two types of Karst soils (terra...
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