Wildfires can profoundly alter rates, magnitudes, and ecological influences of aeolian redistribution of sediments and nutrients. This study examines the influence of fire in a semi‐arid ecosystem using 2 years of continuous passive dust trap data in the northern Great Basin, USA. We analyse the mass flux, organic material content, grain size distribution, and geochemistry of the collected samples to trace the fingerprint of the 2015 Soda Fire through space and time. In areas not affected by fire, dust is characterized by silt‐sized median grains, a geochemical signature consistent with a playa source area, and spatially consistent but seasonally variable dust flux rates. Following fire, dust flux increases significantly within and near the burned area. At burned and topographically sheltered sites, dust deposition in the eighth month following fire was 190% higher than dust deposition 2 years post‐revegetation. Topographically exposed sites recorded only modest increases in dust deposition following fire. Analysis of organic matter indicates all dust samples (both burned and unburned) contained an average of 45% organic matter compared to a watershed average of 1.6% organic matter in soils.

中文翻译：

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火灾后沉积物和养分的风沙重新分布的时空变化

野火会深刻改变沉积物和养分的风向重新分布的速度，幅度和生态影响。本研究使用美国北部大盆地北部2年连续的被动被动集尘器数据，研究了半干旱生态系统中火灾的影响。我们分析了收集到的样品的质量通量，有机物含量，粒度分布和地球化学，以追踪2015年苏打火的指纹图谱。在不受火灾影响的地区，粉尘的特征是粉粒大小的中粒，与Playa来源地区一致的地球化学特征以及空间上一致但季节性变化的粉尘通量率。着火后，燃烧区域内和附近的粉尘通量显着增加。在被烧毁和有地形保护的地点，火灾后第8个月的粉尘沉积量比植被恢复后2年的粉尘沉积量高190％。火灾后，暴露在地形上的场所记录的灰尘沉积仅适度增加。对有机物的分析表明，所有粉尘样品（燃烧的和未燃烧的）均含有平均45％的有机物，而分水岭地区土壤中平均含有1.6％的有机物。