Fig. 1.
Fig. 1.

Carbon concentrations in the A/Ap, B/Bt, and Bt2/C horizons in the W.K. Kellogg Biological Station Long-Term Ecological Research (KBS LTER) treatments (in g C kg soil−1). Error bars represent standard errors. HT is historically tilled, and NT is never tilled.

 


Fig. 2.
Fig. 2.

Total C in the A/Ap, B/Bt, and Bt2/C horizons to 1 m in W.K. Kellogg Biological Station Long-Term Ecological Research (KBS LTER) treatments (in kg C m−2). Error bars represent standard errors. HT is historically tilled, and NT is never tilled.