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Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

机译:萨凡纳生态系统中白蚁生物扰动的量化:OSL测年的应用

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Luminescence dating is one of the most promising technique available for studying bioturbation on pedological timescales. In this study, we use multi-grain and single-grain quartz OSL to quantify termite bioturbation processes (Macrotermes natalensis) in a savannah ecosystem in Ghana. Termites transport soil from depth to the surface to construct termitaria. Over time, erosion levels these mounds and returns the sediment to the soil surface. These two processes of construction and erosion together represent an upward "conveyor belt" sediment transport process. We find that the sediment is effectively bleached during the erosion process allowing us to quantify retrospectively, for the first time, the surface deposition rate, the inverse of the upwards transport rate. At this site, this is similar to 0.28 mm year(-1) and began about 4.000 years ago. Downward mixing through subsurface galleries may replace 10-20% of the volume ka(-1) below the unit formed by reburied termite deposits. (C) 2015 Elsevier B.V. All rights reserved.
机译:发光测年法是在研究时间尺度上研究生物扰动的最有前途的技术之一。在这项研究中,我们使用多颗粒和单颗粒石英OSL来量化加纳萨凡纳生态系统中的白蚁生物扰动过程(Macrotermes natalensis)。白蚁将土壤从深处运送到地表以建造白蚁。随着时间的流逝,这些土丘被侵蚀,并使沉积物返回土壤表面。施工和侵蚀这两个过程共同代表了向上的“输送带”沉积物输送过程。我们发现,在侵蚀过程中,沉积物被有效地漂白了,这使我们能够回顾性地第一次量化表面沉积速率,即向上传输速率的倒数。在这个站点上,这类似于0.28毫米(-1)年,始于大约4000年前。通过地下通道向下混合可以代替白土沉积物形成的单元下方的体积ka(-1)的10-20%。 (C)2015 Elsevier B.V.保留所有权利。

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