Roadway rock-cut slopes have a strong effect on soil organic carbon (SOC), its fractions and overall soil health. However, it is still unknown how SOC fraction properties are influenced under different aspect conditions. We quantified differences in artificial SOC fractions, soil nutrients, and enzyme activities across eight types of roadway rock-cut slopes in Songpan, China. On slopes in landslide areas, four aspects (S, W, N, E) were selected for study, and four equivalent aspects on slopes not affected by a landslide were selected as a reference. SOC, easily oxidizable organic carbon (EOC), particulate organic carbon (POC), urease, sucrase, total nitrogen (TN), and carbon pool management index (CPMI) significantly differed among non-landslide aspects, however, except for POC and urease, did not differ with aspect on landslide-affected slopes. In contrast, dissolved organic carbon (DOC), nitrate nitrogen (NO₃^–-N), and ammonia nitrogen (NH₄⁺-N) significantly differed among aspects on landslide-affected slopes, while they did not significantly differ on aspects of non-landslide slopes. However, higher SOC, EOC, POC, TN, urease, sucrase, and CPMI occurred on non-landslide slopes than landslide-affected slopes of the same aspect, suggesting that landslide slopes may face serious degradation. Our findings indicate that slope aspect and the occurrence of landslides have an influence on SOC pools, and consequently on CPMI.

巷道切石边坡对土壤有机碳（SOC），其组成部分和整体土壤健康有很大影响。但是，仍然未知如何在不同方面条件下影响SOC分数属性。我们对松潘地区八种巷道岩质边坡的人工SOC组分，土壤养分和酶活性之间的差异进行了量化。在滑坡地区的斜坡上，选择了四个方面（S，W，N，E）进行研究，并在不受滑坡影响的斜坡上选择了四个等效方面作为参考。在非滑坡方面，SOC，易氧化有机碳（EOC），颗粒有机碳（POC），脲酶，蔗糖酶，总氮（TN）和碳库管理指数（CPMI）之间存在显着差异，但POC和脲酶除外，在受滑坡影响的斜坡上，坡向没有差异。₃ ^– -N）和氨氮（NH ₄ ⁺ -N）在受滑坡影响的斜坡上各方面均存在显着差异，而在非滑坡斜坡的各方面则无显着差异。但是，非滑坡上的SOC，EOC，POC，TN，脲酶，蔗糖和CPMI的发生率要高于同一方面受滑坡影响的斜坡，这表明滑坡可能面临严重的退化。我们的发现表明，坡度和滑坡的发生对SOC池都有影响，因此对CPMI也有影响。