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We then measured microbial growth, respiration and carbon use efficiency (CUE) in three natural soils (either air-dry or moist). The proposed 18 O-vapor equilibration method provided similar results as the current method of liquid 18 O-water addition when used for moist soils. However, when applied to air-dry soils the liquid 18 O-water addition method overestimated growth by up to 250%, respiration by up to 500%, and underestimated CUE by up to 40%. We finally describe the new insights into biogeochemical cycling of C that the new met