Increasing soil organic carbon (SOC) stocks in agricultural soils is currently of special interest because it can help mitigate global warming through atmospheric carbon (C) sequestration. Recommended management practices, such as conservation agriculture (CA) and conventional tillage with cover crops (CC), could have significant implications for C sequestration potential. A field experiment was carried out in northeast Italy to compare the implementation of CA and CC with conventional agriculture (CV). The experiment began in 2010 on three farms to evaluate SOC stock variation over a 6‐year period. Two extensive soil sampling operations were conducted in 2011 and 2017 in 240 locations, for a total of 1,440 analysed soil samples, considering the SOC stratification within a 0–50‐cm profile. The results suggested that CA changed the SOC distribution rather than the total amount of SOC. Compared to CV, after the introduction of CA, a general increase in SOC (0.25 Mg C ha⁻¹ y⁻¹) was observed in the 0–30‐cm layer, whereas no stock variation was observed in the 0–50‐cm layer. In contrast, compared to CV, the use of CC decreased the SOC stocks by 0.74 Mg C ha⁻¹ y⁻¹ in the 0–50‐cm layer. Over a 6‐year period, no benefit in SOC sequestration was observed with CA and CC. However, we hypothesize that these findings could still be affected by transitory dynamics, highlighting the low soil reactivity to soil‐improving agricultural systems. A longer study period would be required to better understand the potential benefits of CA and CC on SOC sequestration.

中文翻译：

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我们到了转折点了吗？寻找保护性耕作下SOC增加的证据，并涵盖作物实践

目前，增加农业土壤中的土壤有机碳（SOC）储量尤其令人关注，因为它可以通过隔离大气中的碳（C）来缓解全球变暖。推荐的管理措施，例如保护性农业（CA）和传统的带盖作物耕作（CC），可能会对固碳潜力产生重大影响。在意大利东北部进行了田间试验，以比较CA和CC与传统农业（CV）的实施情况。该实验于2010年开始在三个农场进行，以评估6年内的SOC存量变化。考虑到SOC在0–50-cm剖面内的分层，2011年和2017年在240个地点进行了两次广泛的土壤采样操作，总共分析了1,440个土壤样品。结果表明，CA改变了SOC的分布，而不是改变了SOC的总量。与CV相比，引入CA后，SOC普遍增加（0.25 Mg C ha^-1 y ^-1）在0–30–cm层中观察到，而在0–50–cm层中未观察到种群变化。相比之下，与CV相比，使用CC在0-50 cm层中将SOC储量减少了0.74 Mg C ha ^-1 y ^-1。在过去的6年中，CA和CC均未观察到SOC隔离的益处。但是，我们假设这些发现仍然可能受到瞬态动力学的影响，这突出表明土壤对改良土壤的农业系统的反应性较低。为了更好地了解CA和CC对SOC隔离的潜在好处，需要更长的研究时间。