Bulk soil, 0- to 10-cm | Segmented | *F*(*t*) = 31.87 − 0.42**t* | 0.75 | *** | NS | 88.26 | — | — | — | — |

OP-derived C, 0- to 10-cm | Exponential rise to equilibrium | *F*(*t*) = −0.62*exp(−0.038**t*) + 0.62/0.038 | 0.91 | — | — | 66.0 | ** | 18.1 | *** | — |

Pasture-derived C, 0- to 10-cm | Single exponential decay | *F*(*t*) = 31.4*exp(*t** − 0.037) | 0.91 | — | — | 86.2 | *** | 18.7 | — | *** |

Bulk soil, 10- to 20-cm | Segmented | *F*(*t*) = 24.49 − 0.36**t* | 0.83 | *** | NS | 75.52 | — | — | — | — |

OP-derived C, 10- to 20-cm | Linear | *F*(*t*) = −0.27 + 0.10**t* | 0.85 | — | — | 46.4 | — | — | — | — |

Pasture-derived C, 10- to 20-cm | Single exponential decay | *F*(*t*) = 24.1*exp(*t** − 0.02) | 0.84 | — | — | 80.7 | *** | 34.7 | — | *** |

Bulk soil, 20- to 30-cm | Segmented | *F*(*t*) = 19.91 − 0.23**t* | 0.75 | *** | NS | 75.08 | — | — | — | — |

OP-derived C, 20- to 30-cm | Linear | *F*(*t*) = −0.20 + 0.07**t* | 0.7 | — | — | 45.56 | — | — | — | — |

Pasture-derived C, 20- to 30-cm | Single exponential decay | *F*(*t*) = 19.8*exp(*t** − 0.02) | 0.79 | — | — | 77.7 | *** | 40.8 | — | *** |

Bulk soil, 30- to 50-cm | Linear | *F*(*t*) = 29.42 − 0.25**t* | 0.71 | — | — | 87.73 | — | — | — | — |

OP-derived C, 30- to 50-cm | Linear | *F*(*t*) = 0.02 + 0.10**t* | 0.60 | — | — | 66.39 | — | — | — | — |

Pasture-derived C, 30- to 50-cm | Single exponential decay | *F*(*t*) = 29.8*exp(*t** − 0.016) | 0.69 | — | — | 99 | *** | 43.3 | — | *** |