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

Clymans, Wim LU ; Struyf, Eric; Van den Putte, An; Langhans, Christoph; Wang, Zhengang and Govers, Gerard (2015) In Earth Surface Processes and Landforms 40(9). p.1171-1181
Abstract
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... (More)
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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
amorphous silica, inter-rill erosion, rainfall simulation, loam belt, enrichment ratio
in
Earth Surface Processes and Landforms
volume
40
issue
9
pages
1171 - 1181
publisher
John Wiley & Sons
external identifiers
  • wos:000357593600004
  • scopus:84947866444
ISSN
0197-9337
DOI
10.1002/esp.3707
language
English
LU publication?
no
id
08641fc6-b5e3-4cd9-ac54-3e2a8a6fffed (old id 7789416)
date added to LUP
2015-08-28 14:25:40
date last changed
2017-07-23 03:58:22
@article{08641fc6-b5e3-4cd9-ac54-3e2a8a6fffed,
  abstract     = {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.},
  author       = {Clymans, Wim and Struyf, Eric and Van den Putte, An and Langhans, Christoph and Wang, Zhengang and Govers, Gerard},
  issn         = {0197-9337},
  keyword      = {amorphous silica,inter-rill erosion,rainfall simulation,loam belt,enrichment ratio},
  language     = {eng},
  number       = {9},
  pages        = {1171--1181},
  publisher    = {John Wiley & Sons},
  series       = {Earth Surface Processes and Landforms},
  title        = {Amorphous silica mobilization by inter-rill erosion: insights from rainfall experiments},
  url          = {http://dx.doi.org/10.1002/esp.3707},
  volume       = {40},
  year         = {2015},
}