Effects of nitrogen management and straw return on soil organic carbon sequestration and aggregate‐associated carbon

Summary Soil organic carbon (SOC) sequestration and aggregate‐associated carbon (C) can be strongly affected by nitrogen (N) management and straw return. However, an in‐depth understanding of the effect of N and straw application on SOC and aggregate‐associated C is lacking. After 6 years of five inorganic and organic N amounts under straw removal and straw return, we investigated SOC sequestration at a depth of 0–60 cm and soil aggregate‐associated C in the topsoil (0–20 cm). The results were as follows: (i) the 0–60‐cm depth SOC stocks for all treatments except N0 increased by 2.5–25.5% after 6 years, (ii) sequestered SOC was linearly correlated (P