Abstract A step towards a holistic assessment of soil degradation in Europe: Coupling on-site erosion with sediment transfer and carbon fluxes
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A step towards a holistic assessment of soil degradation in Europe: Coupling on-site erosion with sediment transfer and carbon fluxes

机译：欧洲全面评估土壤退化的步骤：将现场侵蚀与沉积物转移和碳通量耦合

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AbstractSoil degradation due to erosion is connected to two serious environmental impacts: (i) on-site soil loss and (ii) off-site effects of sediment transfer through the landscape. The potential impact of soil erosion processes on biogeochemical cycles has received increasing attention in the last two decades. Properly designed modelling assumptions on effective soil loss are a key pre-requisite to improve our understanding of the magnitude of nutrients that are mobilized through soil erosion and the resultant effects. The aim of this study is to quantify the potential spatial displacement and transport of soil sediments due to water erosion at European scale. We computed long-term averages of annual soil loss and deposition rates by means of the extensively tested spatially distributed WaTEM/SEDEM model. Our findings indicate that soil loss from Europe in the riverine systems is about 15% of the estimated gross on-site erosion. The estimated sediment yield totals 0.164 ± 0.013Pgyr−1(which corresponds to 4.62 ± 0.37Mgha−1yr−1in the erosion area). The greatest amount of gross on-site erosion as well as soil loss to rivers occurs in the agricultural land (93.5%). By contrast, forestland and other semi-natural vegetation areas experience an overall surplus of sediments which is driven by a re-deposition of sediments eroded from agricultural land. Combining the predicted soil loss rates with the European soil organic carbon (SOC) stock, we estimate a SOC displacement by water erosion of 14.5Tg yr−1. The SOC potentially transferred to the riverine system equals to 2.2Tgyr−1(~15%). Integrated sediment delivery-biogeochemical models need to answer the question on how carbon mineralization during detachment and transport might be balanced or even off-set by carbon sequestration due to dynamic replacement and sediment burial.Highlights•WaTEM/SEDEM was applied to simulate soil loss and deposition rates at European scale.•Our findings indicate that soil loss in the riverine systems is about 15% of RUSLE2015 estimates.•The estimated sediment yield in Europe totals 0.164 ± 0.013Pgyr−1.•We estimate a SOC displacement by water erosion in Europe of 14.5Tgyr−1.
机译： 摘要 由于侵蚀而造成的土壤退化与两个严重的环境影响有关：（i）现场土壤流失和（ii）沉积物通过景观转移的场外影响。在过去的二十年中，土壤侵蚀过程对生物地球化学循环的潜在影响越来越受到关注。正确设计有效土壤流失的建模假设，是增进我们对通过土壤侵蚀而动员的养分数量及其后果的理解的关键前提。这项研究的目的是在欧洲范围内量化由于水蚀造成的土壤沉积物潜在的空间位移和迁移。我们通过广泛测试的空间分布WaTEM / SEDEM模型，计算了年度土壤流失和沉积速率的长期平均值。我们的发现表明，欧洲河流系统中的土壤流失约占现场总侵蚀量的15％。估计的沉积物总产量为0.164±0.013Pgyr -1 （相当于4.62±0.37Mgha -1 yr -1 在侵蚀区域）。在农田中，最大的现场侵蚀和土壤流失最多（93.5％）。相比之下，林地和其他半天然植被区的沉积物总体过剩，这是由从农业土地侵蚀下来的沉积物的重新沉积所驱动的。结合预测的土壤流失率与欧洲土壤有机碳（SOC）库，我们估计因水蚀造成的SOC位移为14.5Tg yr ce -1 。可能转移到河流系统的SOC等于2.2Tgyr -1 （〜15％）。综合的沉积物输送-生物地球化学模型需要回答以下问题：在分离和运输过程中，由于动态置换和沉积物埋藏，碳固存如何平衡甚至抵消碳的沉积。 突出显示 < ce：label>• WaTEM / SEDEM用于模拟欧洲规模的土壤流失和沉积速率。 • 我们的发现表明土壤河流系统的损失约为RUSLE2015年估计值的15％。 < ce：list-item id =“ u0015”> • 欧洲的预计泥沙产量总计为0.164±0.013Pgyr < ce：sup loc =“ post”> − 1 。 •• 我们估计欧洲因水蚀造成的SOC位移为14.5Tgyr -1 。

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  • 来源
    《Environmental research》 |2018年第2期|291-298|共8页
  • 作者

    P. Borrelli; K. Van Oost; K. Meusburger; C. Alewell; E. Lugato; P. Panagos;

  • 作者单位

    European Commission, Joint Research Centre, Directorate for Sustainable Resources,Environmental Geosciences, University of Basel;

    TECLIM - Georges Lemaître Centre for Earth and Climate Research, Université Catholique de Louvain;

    Environmental Geosciences, University of Basel;

    Environmental Geosciences, University of Basel;

    European Commission, Joint Research Centre, Directorate for Sustainable Resources;

    European Commission, Joint Research Centre, Directorate for Sustainable Resources;

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