Using Rare-Earth Oxide Tracers for Studying Soil Erosion Dynamics
Using Rare-Earth Oxide Tracers for Studying Soil Erosion Dynamics
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DOI：
10.2136/sssaj2003.2790
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发表时间：
2003
影响因子：
2.9
通讯作者：
X. Zhang;M. Nearing;V. Polyakov;J. Friedrich
中科院分区：
文献类型：
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作者：
X. Zhang;M. Nearing;V. Polyakov;J. Friedrich
空间平均土壤侵蚀数据提供的土壤侵蚀动力学的信息很少。动态变化，空间分布的侵蚀数据需要更好地了解侵蚀过程和彻底评估过程为基础的侵蚀预测模型。本研究的目的是探讨直接混合稀土元素（REE）的氧化物与土壤材料的可行性，以跟踪土壤侵蚀在小区尺度，并进一步探索使用这种技术来研究土壤侵蚀动力学的潜力。五稀土氧化物粉末混合卡姆登粉土（细，粉质，混合，中典型Hapludalt）在五个斜坡位置。在10%坡度的4 × 4 m土壤床上进行了6次暴雨试验。在降雨期间收集径流，每次降雨后对表层土壤进行取样。采用快速酸浸法提取稀土元素，电感耦合等离子体质谱（ICPMS）对提取物进行分析。在6次暴雨过程中，由REE计算的输沙量与实测输沙量的平均误差为14.5%。我们的研究结果表明，稀土示踪技术是可行的和健全的，能够产生时空分布的侵蚀数据。结果表明，最严重的侵蚀发生在一个均匀的斜坡的中上段，和总输沙量从每一个部分是正相关的泥沙沉积量在整个斜坡上从该部分。该技术有可能为土壤侵蚀研究带来新的视角。
Spatially averaged soil erosion data provide little information on soil erosion dynamics. Dynamically varied, spatially distributed erosion data are needed to better understand erosion processes and thoroughly evaluate process-based erosion prediction models. The objectives of this study are to examine the feasibility of direct mixing rare-earth element (REE) oxides with soil materials to trace soil erosion at a plot scale and to explore further the potential of using this technique to study soil erosion dynamics. Five REE oxide powders were mixed with a Camden silt soil (fine, silty, mixed, mesic Typic Hapludalt) at five slope positions. Six rainstorms were applied to a 4 by 4 m soil bed at a 10% slope. Runoff was collected during the rains and surface soil was sampled after each rain. All samples were extracted for REE with a quick acid-leaching method and extracts were analyzed by inductively coupled plasma mass spectrometry (ICPMS). Mean error of REE-derived sediment discharge relative to measured total across six rainstorms was 14.5%. Our results demonstrate that the REE-tracing technique is feasible and sound, being capable of producing both spatially and temporally distributed erosion data. Results indicate that the most severe erosion occurred in the upper middle section of a uniform slope, and total sediment delivery from each segment was positively related to amounts of sediment deposition on the entire slope from that segment. This technique has the potential to bring new perspectives to soil erosion research.