Runoff and erosion processes can increase after wildfire and post‐fire salvage logging, but little is known about the specific effects of soil compaction and surface cover after post‐fire salvage logging activities on these processes. We carried out rainfall simulations after a high‐severity wildfire and post‐fire salvage logging to assess the effect of compaction (uncompacted or compacted by skid traffic during post‐fire salvage logging) and surface cover (bare or covered with logging slash). Runoff after 71 mm of rainfall across two 30‐min simulations was similar for the bare plots regardless of the compaction status (mean 33 mm). In comparison, runoff in the slash‐covered plots averaged only 22 mm. Rainsplash in the downslope direction averaged 30 g for the bare plots across compaction levels and decreased significantly by 70% on the slash‐covered plots. Sediment yield totalled 460 and 818 g m⁻² for the uncompacted and compacted bare plots, respectively, and slash significantly reduced these amounts by an average rate of 71%. Our results showed that soil erosion was still high two years after the high severity burning and the effect of soil compaction nearly doubled soil erosion via nonsignificant increases in runoff and sediment concentration. Antecedent soil moisture (dry or wet) was the dominant factor controlling runoff, while surface cover was the dominant factor for rainsplash and sediment yield. Saturated hydraulic conductivity and interrill erodibility calculated from these rainfall simulations confirmed previous laboratory research and will support hydrologic and erosion modelling efforts related to wildfire and post‐fire salvage logging. Covering the soil with slash mitigated runoff and significantly reduced soil erosion, demonstrating the potential of this practise to reduce sediment yield and soil degradation from burned and logged areas.

中文翻译：

---

压实和遮盖作用对加利福尼亚州山谷火灾后火灾打捞后伐木区的径流和侵蚀的影响

野火和火灾后的伐木后，径流和侵蚀过程会增加，但是对于火灾后的伐木活动后的土壤压实和地表覆盖的具体影响知之甚少。我们在进行了高强度野火和大火后的伐木测井之后，进行了降雨模拟，以评估压实度（未大压实或在大火后的伐木过程中被滑行压实）和地表覆盖（裸露或被伐木斜线覆盖）的影响。在两个30分钟的模拟过程中，无论压实状态如何（平均33 mm），在裸露地块上71 mm降雨后的径流都相似。相比之下，斜​​线覆盖地块的径流平均仅为22 mm。在压实水平下，裸露地块在下坡方向的雨滴平均为30 g，而在坡地覆盖的样地上，降雨减少了70％。沉积物总产量为460和818 g m⁻²对于未压实和压实的裸地块，斜线将这些数量平均减少了71％。我们的结果表明，在高强度燃烧后的两年中，土壤侵蚀仍然很高，并且由于径流量和沉积物浓度的显着增加，土壤压实的影响使土壤侵蚀几乎翻了一番。前期土壤水分（干或湿）是控制径流的主要因素，而地表覆盖是降雨和沉积物产量的主要因素。通过这些降雨模拟计算得出的饱和水力传导率和钻头可蚀性证实了先前的实验室研究，并将支持与野火和火灾后打捞记录有关的水文和侵蚀建模工作。用斜线覆盖土壤可减少径流并显着减少土壤侵蚀，