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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Soil particle size distribution and induced soil carbon transport by ephemeral gully erosion in Mediterranean mountain arable land
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Soil particle size distribution and induced soil carbon transport by ephemeral gully erosion in Mediterranean mountain arable land

机译：地中海耕地中短暂沟壑侵蚀土壤粒度分布和诱导土壤碳运输

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摘要

In Mediterranean mountain agroecosystems, soil erosion associated with the development of ephemeral gullies is a common environmental problem that contributes to a loss of nutrient-rich topsoil. Little is known about the influence of ephemeral gully erosion on particle size distribution and its effect on soil organic (SOC) and inorganic (SIC) carbon among different sized soil particles in agricultural soils. In this study, laboratory tests were conducted using velocity settling tube experiments to examine the effects of erosion on sediment particle size distributions from an incised ephemeral gully, associated with an extreme event (235 mm). We also consider subsequent deposition on an alluvial fan in order to assess the distribution of SOC and SIC concentrations and dissolved carbon before and after the extreme event. Soil fractionation was carried out on topsoil samples (5 cm) collected along an ephemeral gully in a cultivated field, located in the lower part of a Mediterranean mountain catchment. The results of this study showed that the sediment transported downstream by runoff plays a key role in the particle size distribution and transportability of soil particles and associated carbon distribution in carbonate rich soils. The eroding sediment is enriched in clay and silt-sized particles at upslope positions with higher SOC contents and gradually becomes coarser and enriched in SIC at the end of the ephemeral gully because the finest particles are washed-out of the study field. The extreme event was associated with an accumulation of dissolved organic carbon at the distal part of the depositional fan. Assessment of soil particle distribution using settling velocity experiments provides basic information for a better understanding of soil carbon dynamics in carbonate rich soils. Processes of soil and carbon transport and relationships between soil properties, erodibility and aggregate stability can be helpful in the development of more accurate soil erosion models. (c) 2019 John Wiley & Sons, Ltd.
机译：在地中海山地农业系统中，与短暂的牙龈发展相关的土壤侵蚀是一个常见的环境问题，这有助于营养丰富的表土。关于薄膜沟壑侵蚀对农业土壤中不同大小土壤颗粒的粒度分布对粒度分布的影响及其对土壤有机（SOC）和无机（SIC）碳的影响。在这项研究中，使用速度沉降管实验进行实验室测试，以检查侵蚀对沉积物粒度分布的影响，与极端事件（235 mm）相关。我们还考虑随后对冲积风扇的沉积，以便在极端事件前后评估SoC和SiC浓度和溶解碳的分布。在沿着短暂的沟壑中沿着短暂的沟壑中收集的纹理沟（5cm）进行土壤分馏，位于地中海集水区的下半部分。该研究的结果表明，径流下游的沉积物在土壤颗粒的粒度分布和碳酸盐含量中的碳酸盐分布和相关的碳分布中发挥着关键作用。腐蚀沉积物在具有更高的SOC含量的上升性位置的粘土和淤泥颗粒中富集，并且在短暂的沟壑的末端逐渐变得粗糙并且在SiC中富集，因为最优质的颗粒被洗掉研究领域。极端事件与沉积风扇的远端部分处的溶解有机碳的积累有关。利用稳定速度实验评估土壤颗粒分布提供了更好地理解碳酸盐富含土壤土壤碳动力学的基本信息。土壤和碳运输的过程和土壤性质之间的关系，易用和聚集稳定性之间的关系可能有助于开发更准确的土壤侵蚀模型。 （c）2019 John Wiley＆Sons，Ltd。

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