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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Amorphous silica mobilization by inter-rill erosion: insights from rainfall experiments
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Amorphous silica mobilization by inter-rill erosion: insights from rainfall experiments

机译：钻孔间侵蚀侵蚀无定形二氧化硅：降雨实验的见解

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摘要

Amorphous silica (ASi) carried in suspension by rivers is an important component in the global Si budget. Water erosion processes in cultivated catchments are likely to drive ASi delivery to the river system. However, no studies have investigated the controls on ASi mobilization by erosional processes in croplands. Rainfall experiments were performed on split fields (i.e. a part conventionally ploughed and a part under reduced tillage) to simulate ASi mobilization by inter-rill erosion in croplands, and identify its dependency on soil, field and rainfall characteristics. The ASi content of the soil and the inter-rill erosion rate were determined as the major controls on ASi mobilization. Variables such as tillage technique and crop type did not have a consistent direct or indirect effect. Inter-rill erosion is clearly selective with respect to ASi, indicating association of ASi with the fine soil fraction and with soil organic carbon. Our experiments demonstrate that erosion increases due to human perturbation will increase the delivery of reactive Si to aquatic systems. We estimate that globally, c. 7% of all reactive Si that enters aquatic systems is derived from erosion of agricultural soils. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：河流中悬浮的非晶硅（ASi）是全球Si预算中的重要组成部分。耕种流域的水蚀过程可能会促使ASi输送到河流系统。但是，尚无研究调查耕地侵蚀过程对ASi动员的控制。在分开的田地（即部分耕作的耕地和一部分耕种减少的耕地）上进行了降雨实验，以模拟农田间小孔间侵蚀引起的ASi动员，并确定其对土壤，田地和降雨特征的依赖性。确定土壤中的ASi含量和小孔间侵蚀速率是ASi动员的主要控制措施。耕作技术和农作物类型等变量没有一致的直接或间接影响。钻头间侵蚀相对于ASi显然是选择性的，这表明ASi与细土部分和土壤有机碳之间的关系。我们的实验表明，由于人为扰动而引起的侵蚀增加将增加反应性Si向水生系统的输送。我们估计在全球范围内c。进入水生系统的所有活性硅中有7％来自农业土壤的侵蚀。版权所有（c）2015 John Wiley＆Sons，Ltd.

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