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Amorphous silica mobilization by inter-rill erosion: insights from rainfall experiments

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Clymans, Wim Struyf, Eric Van den Putte, An Langhans, Christoph Wang, Zhengang [UCL] Govers, Gerard

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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2015
Language Anglais
Journal information "Earth Surface Processes and Landforms" - Vol. 40, no.9, p. 1171-1181 (2015)
Peer reviewed yes
Publisher JohnWiley & Sons Ltd. (Chichester)
issn 0197-9337
e-issn 1096-9837
Publication status Publié
Affiliation UCL - SST/ELI - Earth and Life Institute
Links
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Bibliographic reference Clymans, Wim ; Struyf, Eric ; Van den Putte, An ; Langhans, Christoph ; Wang, Zhengang ; et. al. Amorphous silica mobilization by inter-rill erosion: insights from rainfall experiments. In: Earth Surface Processes and Landforms, Vol. 40, no.9, p. 1171-1181 (2015)
Permanent URL http://hdl.handle.net/2078.1/172991