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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Topographic variation in soil erosion and accumulation determined with meteoric Be-10
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Topographic variation in soil erosion and accumulation determined with meteoric Be-10

机译：土壤侵蚀和积累的地形变化与陨石测定的成分为-10

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摘要

Understanding natural soil redistribution processes is essential for measuring the anthropogenic impact on landscapes. Although meteoric beryllium-10 (Be-10) has been used to determine erosion processes within the Pleistocene and Holocene, fewer studies have used the isotope to investigate the transport and accumulation of the resulting sediment. Here we use meteoric Be-10 in hilltop and valley site soil profiles to determine sediment erosion and deposition processes in the Christina River Basin (Pennsylvania, USA). The data indicate natural erosion rates of 14 to 21 mm 10(-3) yr and soil ages of 26 000 to 57 000 years in hilltop sites. Furthermore, valley sites indicate an alteration in sediment supply due to climate change (from the Pleistocene to the Holocene) within the last 60 000 years and sediment deposition of at least 0.5-2 m during the Wisconsinan glaciation. The change in soil erosion rate was most likely induced by changes in geomorphic processes; probably solifluction and slope wash during the cold period, when ice advanced into the mid latitudes of North America. This study shows the value of using meteoric Be-10 to determine sediment accumulation within the Quaternary and quantifies major soil redistribution occurred under natural conditions in this region. (c) 2018 John Wiley & Sons, Ltd.
机译：了解天然土壤再分配过程对于测量对景观的人为影响至关重要。虽然Meteoric Beryllium-10（BE-10）已被用于确定更新世和全新世中的侵蚀过程，但更少的研究使用同位素来研究所得沉积物的运输和积累。在这里，我们在山顶和谷地土壤型材中使用陨石BE-10，以确定Christina河流域（宾夕法尼亚州，美国）的沉积物腐蚀和沉积过程。数据在山顶网站中表明14至21 mm 10（-3）岁的土壤侵蚀率为14至21毫米10（-3），土壤衰退为26000至57 000岁。此外，山谷部位表示由于气候变化（从全新世）在过去60 000年内的气候变化（从全新世）和沉积物沉积在威斯康星州冰川期间至少0.5-2米的沉积物供应的改变。土壤侵蚀率的变化最有可能被几何过程的变化诱导;可能在寒冷时期的肌肉和斜坡洗涤，当冰进入北美中期的冰层时。本研究表明，使用陨石BE-10的价值，以确定第四纪内的沉积物积累，并在该地区的自然条件下量化主要土壤再分配。 （c）2018 John Wiley＆Sons，Ltd。

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