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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Negligible soil erosion in a burned mountain watershed, Canadian Rockies: Field and modelling investigations considering the role of duff
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Negligible soil erosion in a burned mountain watershed, Canadian Rockies: Field and modelling investigations considering the role of duff

机译：在加拿大洛矶山脉的烧山流域中可忽略的土壤侵蚀：考虑达芙作用的田野和模型调查

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Increased soil erosion in immediate post-wildfire years has been well documented in the literature, but many unanswered questions remain about the factors controlling erosional responses in different regional settings. The field site for the present study was located in a closed canopy, subalpine forest in Kootenay National Park, British Columbia that was subjected to a high-intensity crown fire in the summer of 2003. Low soil erosion values were documented at the study site in the years immediately following the 2003 wildfire, with estimates ranging from approximately 10~(-1) up to 10~0tha~(-1). Following the wildfire, notable duff coverage (the duff layer is the combined fermentation and humus soil organic layers) remained above the mineral soil. This finding supports earlier studies documenting only partial duff consumption by high-intensity wildfires in the boreal forest of Canada. It is postulated that remnant duff coverage after many high-intensity wildfires impacts the hydrological and soil erosional response to rainstorm events in post-wildfire years. In particular, duff provides detention storage for infiltrating rainfall and, therefore, may inhibit the generation of overland flow. Furthermore, duff also provides a physical barrier to soil erosion. The Green-Ampt model of rainfall infiltration is employed to better assess how interactions between rainfall duration/intensity and soil/duff properties affect hydrological response and the generation of overland flow. Model results show that duff provides an effective zone for detention storage and that duff accommodates all rainfall intensities to which it was subjected without the occurrence of surface ponding. In addition, the penetration of the wetting front is relatively slow in duff due to its high porosity and water storage potential.
机译：野火后立即增加土壤侵蚀的文献已经有充分的文献记载，但是关于控制不同区域环境中侵蚀响应的因素，仍有许多未解决的问题。本研究的现场位于不列颠哥伦比亚省库特尼国家公园的一个封闭的冠层亚高山森林中，该森林在2003年夏天遭受了高强度的树冠大火。紧接2003年野火之后的年份，估计范围从大约10〜（-1）到10〜0tha〜（-1）。在野火之后，明显的粉屑覆盖（粉屑层是发酵和腐殖质土壤有机层的结合层）仍保留在矿物土壤上方。这一发现支持了较早的研究，该研究仅记录了加拿大北方森林中高强度野火消耗的部分达芙。据推测，许多高强度野火后残留的达芙油会影响野火后年份对暴雨事件的水文和土壤侵蚀响应。特别地，达夫提供用于渗透降雨的蓄水库，因此可以抑制陆上水流的产生。此外，达夫还为土壤侵蚀提供了物理屏障。降雨入渗的Green-Ampt模型用于更好地评估降雨持续时间/强度与土壤/土壤性质之间的相互作用如何影响水文响应和陆上径流的产生。模型结果表明，粉尘提供了一个有效的滞留区，并且粉尘可以适应所有降雨强度，而不会出现表面积水。另外，由于其高孔隙率和储水潜力，润湿面的渗透在达夫方面相对较慢。

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