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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Erodibility of soil and organic matter: independence of organic matter resistance to interrill erosion
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Erodibility of soil and organic matter: independence of organic matter resistance to interrill erosion

机译：土壤和有机物的可蚀性：有机物对钻头间侵蚀的抵抗性

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摘要

The enrichment of organic matter in interrill sediment is well documented; however, the respective roles of soil organic matter (SOM) and interrill erosion processes for the enrichment are unclear. In this study, organic matter content of sediment generated on two silts with almost identical textures, but different organic matter contents and aggregations, was tested. Artificial rainfall was applied to the soils in wet, dry and crusted initial conditions to determine the effects of soil moisture and rainfall and drying history on organic matter enrichment in interrill sediment. While erosional response of the soils varied significantly, organic matter enrichment of sediment was not sensitive to initial soil conditions. However, enrichment was higher on the silt with a lower organic matter content and lower interrill erodibility. The results show that enrichment of organic matter in interrill sediment is not directly related to either SOM content or soil interrill erodibility, but is dominated by interrill erosion processes. As a consequence of the complex interaction between soil, organic matter and interrill erosion processes, erodibility of organic matter should be treated as a separate variable in erosion models. Further research on aggregate breakdown, in particular the content and fate of the organic matter in the soil fragments, is required. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：井间沉积物中有机质的富集有据可查。但是，尚不清楚土壤有机质（SOM）和钻孔间侵蚀过程对富集的各自作用。在这项研究中，测试了两个质地几乎相同但有机质含量和聚集度不同的粉砂产生的沉积物的有机质含量。在潮湿，干燥和结ted的初始条件下，对土壤进行了人工降雨，以确定土壤水分，降雨和干燥历史对层间沉积物中有机质富集的影响。尽管土壤的侵蚀响应变化很大，但沉积物有机质的富集对初始土壤条件并不敏感。但是，粉砂中的富集度较高，有机物含量较低，钻孔间的侵蚀性较低。结果表明，层间沉积物中有机质的富集与SOM含量或土壤层间可蚀性均不直接相关，而是以层间侵蚀过程为主导。由于土壤，有机物和钻孔间侵蚀过程之间复杂的相互作用，在侵蚀模型中应将有机物的可蚀性作为一个单独的变量处理。需要进一步研究骨料分解，特别是土壤碎片中有机物的含量和命运。版权所有（c）2007 John Wiley＆Sons，Ltd.

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