Fig. 6
From: Legume-based rotation enhance long-term soil carbon storage in eastern Oregon dryland wheat systems
Changes in carbon (C) and nitrogen (N) stocks (t ha⁻¹) at a 0–30 cm depth over time in bulk soil and the mineral-associated organic carbon fraction (MAOM C) across three treatments: (A) tilled winter wheat–summer fallow systems (WW–SF), and winter wheat–spring pea systems (WW–SP), under (B) conventional tillage (CT) and (C) no-till (NT). Each bar represents the mean ± standard deviation of carbon (C) in bulk soil and MAOM, while the black circles represent nitrogen (N). Mean values sharing the same letter indicate no significant difference mong sampling times within each treatment. Green letters denote significant differences in bulk soil C, while gray capital letters correspond to significant differences in MAOM C, as determined by the Tukey post-hoc test (p ≤ 0.05).
