In the context of climate change, soil is a major pool of stable carbon on earth, yet knowledge on soil carbon turnover is limited. The difference in ¹³C/¹²C content observed between C3 and C4 plant crops has been widely used to distinguish the sources of soil organic carbon under continuous monoculture, but not in C3–C4 rotations. We studied the stability of the δ¹³C_SOC content and the effect of no tillage, conventional tillage, and rotary tillage in 4 soils sampled at 0–5, 5–10, and 10–20 cm depth, in 2018–2019 in a field with long-term history of wheat (C3) and maize (C4) rotations. We also analyzed the results from the literature. The results show that the δ¹³C_SOC is not statistically affected by the sampling date, thus allowing to use this method to distinguish C3 and C4 plant contributions in rotations. Moreover, no-tillage favored the preservation of wheat carbon, and this preservation was accentuated at 10–20 cm depth. δ¹³C_SOC is also affected by fertilization and irrigation. The literature confirmed that wheat-derived carbon is better preserved that maize-derived carbon, on the average.

在气候变化的背景下，土壤是地球上主要的稳定碳库，但关于土壤碳周转的知识有限。在差值¹³ C / ¹² C3和C4植物之间观察到C含量庄稼已被广泛用于区分土壤有机碳的下单作连续的源，但不是在C3-C4旋转。我们研究了2018-2019 年在 0-5、5-10 和 10-20 cm 深度取样的 4 个土壤中δ ¹³ C _SOC含量的稳定性以及免耕、常规耕作和旋耕的影响。具有长期小麦 (C3) 和玉米 (C4) 轮作历史的田地。我们还分析了文献中的结果。结果表明，δ ¹³ C _SOC不受采样日期的统计影响，因此允许使用此方法区分轮换中的 C3 和 C4 植物贡献。此外，免耕有利于小麦碳的保存，这种保存在 10-20 厘米深度得到加强。δ ¹³ C _SOC也受施肥和灌溉的影响。文献证实，平均而言，小麦衍生的碳比玉米衍生的碳保存得更好。