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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >On the development of a magnetic susceptibility-based tracer for aeolian sediment transport research
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On the development of a magnetic susceptibility-based tracer for aeolian sediment transport research

机译：基于磁化率的磁化性探测器的开发 - 用于海湾沉积物转运研究

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摘要

Aeolian processes - the erosion, transport, and deposition of sediment by wind - play important geomorphological and ecological roles in drylands. These processes are known to impact the spatial patterns of soil, nutrients, plant-available water, and vegetation in many dryland ecosystems. Tracers, such as rare earth elements and stable isotopes have been successfully used to quantify the transport and redistribution of sediment by aeolian processes in these ecosystems. However, many of the existing tracer techniques are labor-intensive and cost-prohibitive, and hence simpler alternative approaches are needed to track aeolian redistribution of sediments. To address this methodological gap, we test the applicability of a novel metal tracer-based methodology for estimating post-fire aeolian sediment redistribution, using spatio-temporal measurements of low-field magnetic susceptibility (MS). We applied magnetic metal tracers on soil microsites beneath shrub vegetation in recently burned and in control treatments in a heterogeneous landscape in the Chihuahuan desert (New Mexico, USA). Our results indicate a spatially homogeneous distribution of the magnetic tracers on the landscape after post-burn wind erosion events. MS decreased after wind erosion events on the burned shrub microsites, indicating that these areas functioned as sediment sources following the wildfire, whereas they are known to be sediment sinks in the undisturbed (e.g. not recently burned) ecosystem. This experiment represents the first step toward the development of a cost-effective and non-destructive tracer-based approach to estimate the transport and redistribution of sediment by aeolian processes. (c) 2018 John Wiley & Sons, Ltd.
机译：风暴泥沙的侵蚀，运输和沉积 - 在旱地中发挥重要地貌和生态作用的侵蚀，运输和沉积。已知这些方法会影响许多旱地生态系统中的土壤，营养，植物，植物水和植被的空间模式。诸如稀土元素和稳定同位素的示踪剂已经成功地用于量化这些生态系统中的Aeolian过程的沉积物的运输和再分配。然而，许多现有的示踪技术是劳动密集型和成本持有的，因此需要更简单的替代方法来跟踪沉积物的天气再分配。为了解决该方法论差距，我们使用低现场磁化率（MS）的时空测量来测试新型金属示踪方法用于估算火灾后沉积物再分精的适用性。我们在最近烧伤的灌木植被下的土壤微浴中应用了磁性金属示踪剂，在奇瓦华沙漠（新墨西哥州新墨西哥）中的异质景观中的控制处理。我们的结果表明燃烧后风腐蚀事件后横向横向磁性示踪剂的空间均匀分布。在烧毁的灌木微源上的风腐蚀事件后，MS减少，表明这些区域作为野火后的沉积物来源发挥作用​​，而他们被称为沉积物沉积在未受干扰的（例如，最近烧伤）生态系统中。该实验代表了发展成本效益和基于非破坏性的示踪剂的第一步，以估计风神过程沉积物的运输和再分配。 （c）2018 John Wiley＆Sons，Ltd。

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