The rehabilitation of disaster-prone areas can enhance the stability of soil structure and is a common way to increase organic carbon storage. The response of soil carbon sequestration pathways to different recovery modes is not clear, especially in mountain soils. After 11 years of recovery, we evaluated soil organic carbon (SOC) sequestration pathways in plantations (dominated by Olea europaea ‘Leccino’), croplands [Zea mays (L.)] natural shrublands (Lycium chinense Mill), and natural grasslands [Setaria viridis (L.) Beauv]. The physical and chemical properties of the soil and the ¹³C natural abundance of each aggregate and its density components were studied. The results showed that, during the restoration process, the soil organic carbon content of natural grassland increased the most, while the δ¹³C value of soil of natural shrubs was the highest. The natural abundance of ¹³C was used to reveal the pathway of C flow in soil organic matter (SOM), as follows: free light fractions (ρ < 1.6 g cm⁻³)→mineral fractions (ρ > 2.0 g cm⁻³)→dense occluded fractions (ρ from 1.6 to 2.0 g cm⁻³) (in plantation, natural shrubland, and grassland). However, in cropland soil, C flowed as follows: mineral fractions→free light fractions→dense occluded fractions. Specifically, the SOC content decreased with aggregate particle size, and after entering the soil, plant litter was first stored in large aggregates and then decomposed into the free light fraction. The study revealed the mechanism of organic carbon sequestration in the restoration area, emphasizing that artificial restoration treatment can change the carbon conversion pathway, and reduced the sequestration of organic carbon.

灾区的恢复可以增强土壤结构的稳定性，是增加有机碳储量的常用方法。土壤固碳途径对不同恢复模式的响应尚不清楚，特别是在山地土壤中。经过 11 年的恢复，我们评估了种植园（以油橄榄 'Leccino'为主）、农田 [ Zea mays (L.) ] 天然灌木丛 ( Lycium chinense Mill ) 和天然草地 [ Setaria中的土壤有机碳 (SOC) 固存途径viridis (L.) Beauv ]。土壤理化性质及¹³研究了每种聚集体的 C 自然丰度及其密度成分。结果表明，在恢复过程中，天然草地土壤有机碳含量增加最多，而天然灌木土壤δ ¹³ C值最高。¹³ C的自然丰度用于揭示土壤有机质（SOM）中C流动的途径，如下：游离轻组分（ρ < 1.6 g cm ^-3）→矿物组分（ρ > 2.0 g cm ^-3） →致密闭塞部分（ρ 从 1.6 到 2.0 g cm ^-3)（在人工林、天然灌木丛和草地中）。然而，在农田土壤中，碳的流动方式如下：矿物组分→游离轻组分→致密封闭组分。具体而言，SOC含量随团聚体粒径的降低而降低，进入土壤后，植物枯落物首先以大团聚体形式储存，然后分解为游离轻组分。研究揭示了修复区有机碳封存的机理，强调人工修复处理可以改变碳转化途径，减少有机碳的封存。