Abstract Sediment export rates are sensitive to different parent materials, changes in land use, human impact and climate, but the landscape response to such changes is difficult to interpret, and more knowledge of soil erosion hot spots is still needed. Special focus should be directed to examine the role of the erosional impact of water movement in mobilising stable elements in soils that become then available to be transferred in agroecosystems. Our main objective was to investigate the mobilisation and redistribution of 15 major and trace elements in the soil along a karstic hillslope in north-eastern Spain. To this purpose, we selected a representative soil catena with two distinctive sections based on the parent material in which the main soil properties and soil erosion patterns are very well characterised. Element contents were determined by ICP-OES and soil redistribution rates were obtained using 137Cs for each of the 12 and 11 soil profiles sampled in the upper and lower sections, respectively. The elemental composition in soil profiles is related to their landscape features and the influence of soil properties and soil redistribution rates are explored. In each section of the soil catena, the distinctive physiographic characteristics of the slope, distribution of land uses, presence of linear landscape elements, and the intrinsic soil properties, namely SOC, HC and grain size, affect runoff and determine the connectivity of eroded sediment, thus affecting the geochemical dynamics. The results of this investigation showed that the different processes governed by infiltration in the upper section versus runoff in the lower section affect elemental mobilisation along the soil catena and contribute to understanding processes of elemental transference in Mediterranean agroecosystems.

中文翻译：

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受土壤有机碳和水通量影响的片状侵蚀的元素动员沿着具有两种对比母体材料的放射性土壤链

摘要 沉积物输出率对不同母质、土地利用变化、人类影响和气候敏感，但景观对此类变化的响应难以解释，仍需要更多的土壤侵蚀热点知识。应特别关注水运动的侵蚀影响在动员土壤中的稳定元素方面的作用，这些元素随后可在农业生态系统中转移。我们的主要目标是调查西班牙东北部喀斯特山坡土壤中 15 种主要和微量元素的动员和重新分布。为此，我们根据母体材料选择了具有两个不同部分的代表性土壤链，其中的主要土壤特性和土壤侵蚀模式得到了很好的表征。元素含量由 ICP-OES 确定，土壤再分布率使用 137Cs 获得，分别用于在上部和下部采样的 12 和 11 个土壤剖面中的每一个。土壤剖面中的元素组成与其景观特征有关，并探讨了土壤性质和土壤再分配率的影响。在土壤链的每个部分，斜坡的独特地貌特征、土地利用的分布、线性景观元素的存在以及土壤内在特性，即 SOC、HC 和粒度，影响径流并决定侵蚀沉积物的连通性，从而影响地球化学动力学。