Factors and thresholds determining sediment delivery pathways between forest road and stream in mountainous watershed

[Display omitted] •Different delivery pathways have variable impacts on local plant and soil communities.•Bulk density and plant diversity varied significantly downward the pathways.•Slope and contributing area are the main external driver determining gully occurrence.•Erosion resistance determines...

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Veröffentlicht in:Catena (Giessen) 2023-05, Vol.224, p.106976, Article 106976
Hauptverfasser: Wang, An, Zhao, Qinghe, Yu, Zaihui, Yu, Jinhai, Liu, Yi, Wang, Peng, Zhang, Guiju, Zhou, Jiliang, Ding, Shengyan
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Sprache:eng
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Zusammenfassung:[Display omitted] •Different delivery pathways have variable impacts on local plant and soil communities.•Bulk density and plant diversity varied significantly downward the pathways.•Slope and contributing area are the main external driver determining gully occurrence.•Erosion resistance determines the development of pathways from partial to full gully.•We established critical thresholds for initiation and development of gully pathways. Road erosion is a global environmental issue. The transport of eroded sediment from road to stream can devastatingly impact water quality. Research efforts to combat this issue have prioritized maintaining roads and preventing erosion. Little research has explored the fate of eroded road materials in their transport from road to stream. Therefore, taking the Xiangchagou watershed in the Dabie Mountains of China as a case, this study investigated how local geography determines the formation and thresholds of different delivery pathways (gullied, partially gullied, and diffuse pathways) for road-eroded sediment through runoff, based on the binary logistic regression analysis, random forest model, and the lowest point data fitting methods. It explored how these different pathways have variable impacts on local plant and soil communities. Our results showed that soil D50, bulk density, shrub-grass coverage, and local plant diversity varied significantly (p 
ISSN:0341-8162
1872-6887
DOI:10.1016/j.catena.2023.106976