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首页> 外文期刊>Quaternary geochronology >Using portable OSL reader to obtain a time scale for soil accumulation and erosion in archaeological terraces, the Judean Highlands, Israel
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Using portable OSL reader to obtain a time scale for soil accumulation and erosion in archaeological terraces, the Judean Highlands, Israel

机译：使用便携式OSL读者获得考古露台的土壤积累和侵蚀的时间规模，以色列

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摘要

Current conventions on the fate of agricultural bench terraces in the mountainous Mediterranean climatic zones, assume that after abandonment terraces undergo rapid degradation and soil loss. First walls crumble, followed by soil washed out of breaches in the walls by runoff, resulting in rapid erosion of soil from the slopes downhill into the streams. Additionally, soil erosion may explain why previous optically stimulated luminescence (OSL) dating of terrace soils in the Judean Highlands, Israel, found mostly young soils dating to the past 700 years, and only occasionally were older ages obtained for soils at the very base of these terraces. In contrast, observations made in the same region show that slopes with degraded terraces appear to still retain much soil even though only faint remains of the terraces exist. To test if terraces and soils indeed erode entirely and how long this might take, a relatively smooth hill slope showing remains of highly degraded sets of terraces was studied. Samples were collected from excavated pits for full OSL dating, in addition to samples densely collected for OSL measurements using a portable OSL reader (PR). Air-born photogrammetry was used to obtain high spatial resolution Digital Elevation Model. Results show that the main body of terraces was first built similar to 800 years ago and maintained until 175-100 years age when they were abandoned and subsequently degraded. Since then 30-45% of soil volume was lost to erosion, however steady-state was reached at a relatively high slope of 65%, with stabilization by vegetation. The thick soil present on most of the slope suggests that after the first stage of rapid degradation the slopes reache equilibrium, most likely due to vegetation that reduces direct soil erosion, so most of the soil is retained on the slope. Finally, the PR allows for a much more nuanced understanding of terrace soil history.
机译：目前关于山区地中海气候区的农业台阶的命运的惯例，假设放弃梯田经过快速降解和土壤损失。第一墙崩溃，其次是土壤通过径流在墙壁中冲出泄露，导致从下坡的斜坡渗透到溪流中的土壤快速侵蚀。此外，土壤侵蚀可以解释为什么先前的光学刺激的发光（OSL）在以色列的朱迪亚高地的露台土壤约会，主要发现了历史新700年的年轻土壤，而且偶尔均为较老年的年龄在基础上为土壤获得老年人这些露台。相比之下，在同一区域中制作的观察结果表明，具有降解露台的斜率似乎仍然保持太大的土壤，即使仅存在露台的微弱残留。为了测试露台和土壤确实完全侵蚀，这可能需要多长时间，研究了一个相对较小的山坡，显示出高度退化的梯田的遗骸。除了使用便携式OSL读取器（PR）密集地收集的样品外，还从挖掘型挖掘坑收集样品。空气出生的摄影测量用于获得高空间分辨率数字高度模型。结果表明，梯田的主体是第一个类似于800年前建造的，并在被遗弃并随后退化后直到175-100岁。从那时起，30-45％的土壤体积损失侵蚀，然而稳定稳定率为65％，植被稳定。大多数斜坡上存在的厚实的土壤表明，在快速降解的第一阶段之后，斜坡达到平衡，很可能是由于植被减少了直接土壤侵蚀，因此大多数土壤保留在斜坡上。最后，PR允许对露台土壤历史的更加细致的理解。

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