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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Annual fossil organic carbon delivery due to mechanical and chemical weathering of marly badlands areas
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Annual fossil organic carbon delivery due to mechanical and chemical weathering of marly badlands areas

机译：由于沼泽荒地地区的机械和化学风化，每年的化石有机碳排放量

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A key issue in the study of the carbon cycle is constraining the stocks and fluxes in and between C-reservoirs. Among these, the role and importance of fossil organic carbon (FOC) release by weathering of outcropping sedimentary rocks on continental surfaces is still debated and remains poorly constrained. Our work focuses on FOC fluxes due to chemical and mechanical weathering of marls in two experimental watersheds with typical badlands geomorphology (Draix watersheds, Laval and Moulin, Alpes de Haute Provence, France). Organic matter from bedrock, soil litter and riverine particles are characterized by Rock-Eval 6 pyrolysis. FOC fluxes due to mechanical weathering are then estimated by monitoring the annual particulate solid exports at the outlets of the watersheds (1985-2005 period). FOC fluxes from chemical weathering were calculated using Ca ~(2+) concentrations in dissolved loads (year 2002) to assess the amount of FOC released by the dissolution of the carbonate matrix. Results show that FOC delivery is mainly driven by mechanical weathering, with a yield ranging from 30 to 59 t km ~(-2) yr ~(-1) in the Moulin (0.08 km ~2) and Laval (0.86 km ~2) catchments, respectively, (1985-2005 average). The release of FOC attributed to chemical weathering was 2.2 to 4.2 t km ~(-2) for the year 2002. These high FOC fluxes from badlands are similar to those observed in tectonically active mountain catchments. At a regional scale, badland outcropping within the Durance watershed does not exceed 0.25% in area of the Rh?ne catchment, but could annually deliver 12 000 t yr ~(-1) of FOC. This flux could correspond to 27% of the total particulate organic carbon (POC) load exported by the Rh?ne River to the Mediterranean Sea. At a global scale, our findings suggest that erosion of badlands may contribute significantly to the transfer of FOC from continental surfaces to depositional environments.
机译：碳循环研究中的一个关键问题是限制碳储层内部和之间的储量和通量。在这些之中，通过对大陆表面露头沉积岩石进行风化来释放化石有机碳（FOC）的作用和重要性仍存在争议，并且约束仍然很有限。我们的工作重点是在两个具有典型荒地地貌的实验流域（Draix流域，Laval和Moulin，法国阿尔卑斯上普罗旺斯地区）中，由于化学和机械风化的泥灰而产生的FOC通量。 Rock-Eval 6热解的特征是基岩，土壤垃圾和河流颗粒中的有机物。然后，通过监测流域出口处（1985-2005年）的年度颗粒固体出口量，估算由机械风化引起的FOC通量。化学风化作用下的FOC通量是使用溶解负荷中的Ca〜（2+）浓度计算的（2002年），以评估碳酸盐基质溶解后释放的FOC量。结果表明，FOC的输送主要受机械风化作用的影响，在红磨坊（0.08 km〜2）和拉瓦尔（0.86 km〜2）中，产量为30至59 t km〜（-2）yr〜（-1）。流域，分别（1985-2005年平均值）。 2002年归因于化学风化的FOC释放量为2.2至4.2 t km〜（-2）。这些来自荒地的高FOC通量类似于在构造活跃的山区流域中观察到的通量。在区域范围内，杜兰斯流域内的荒地露头在罗纳河集水区的面积不超过0.25％，但每年可交付12000吨〜（-1）FOC。这种通量可能相当于罗纳河向地中海出口的总有机颗粒碳（POC）的27％。在全球范围内，我们的发现表明，荒地的侵蚀可能对FOC从大陆表面到沉积环境的转移有很大贡献。

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