Although plant canopies are widely recognized to protect the soil and help mitigate soil erosion, recent research has shown that the majority of soil scour prevention can be attributed to the roots. Because roots are more difficult and time-consuming to measure than shoots, research in this area has largely been limited to understanding the influence of large roots and/or whole root systems, and there is little understanding on how smaller root traits, such as root hairs, contribute to the root system's ability to mitigate soil erosion. Therefore, this study subjected a root hairless mutant (brb) of barley (Hordeum vulgare L. cv. Pallas) and its wild-type (WT) genotype to simulated rainfall. The results showed that increasing root presence significantly reduced soil erosion, but the impact of root hairs was less clear. Soil detachment significantly decreased as root length density increased, with no apparent genotypic difference in this relationship. The brb root systems produced significantly thinner (0.8-fold) roots and a higher percentage (1.1-fold) of fine roots, with both traits previously associated with increased ability to mitigate soil erosion. However, brb mesocosms produced a similar quantity of eroded soil to WT mesocosms, suggesting that root hairs in WT plants could have compensated for their root systems' reduced ability to mitigate soil erosion.

中文翻译：

---

模拟降雨对根毛是否影响土壤侵蚀的基于中观的评估

尽管植物冠层被广泛认为可以保护土壤并有助于减轻水土流失，但最近的研究表明，大部分土壤冲刷预防可归因于根部。由于根的测量比芽更困难且更耗时，因此该领域的研究很大程度上仅限于了解大根和/或整个根系的影响，而对较小的根特征（例如根）的影响知之甚少。毛发，有助于根系减轻土壤侵蚀的能力。因此，本研究对大麦 ( Hordeum vulgare ) 的根无毛突变体 ( brb )L.简历 Pallas) 及其野生型 (WT) 基因型模拟降雨。结果表明，增加根系存在显着减少了土壤侵蚀，但根毛的影响不太明显。随着根长密度的增加，土壤脱离显着减少，这种关系没有明显的基因型差异。的BRB产生显著更薄（0.8倍）的根系统根和更高百分比（1.1倍）细根的，与先前具有增加的能力，以减轻土壤侵蚀相关的两个性状。然而，brb 中胚层产生的侵蚀土壤数量与 WT 中胚层相似，这表明 WT 植物中的根毛可以补偿其根系减轻土壤侵蚀能力的下降。