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| Titel |
Shadow analysis of soil surface roughness compared to the chain set method and direct measurement of micro-relief |
| VerfasserIn |
R. García Moreno, M. C. Díaz Alvarez, A. M. Tarquis, A. Paz González, Antonio Saa Requejo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 8 ; Nr. 7, no. 8 (2010-08-18), S.2477-2487 |
| Datensatznummer |
250004934
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| Publikation (Nr.) |
 copernicus.org/bg-7-2477-2010.pdf |
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| Zusammenfassung |
Soil surface roughness (SSR) expresses soil susceptibility to wind and water
erosion and plays an important role in the development and the maintenance
of soil biota. Several methods have been developed to characterise SSR based
on different methods of acquiring data. Because the main problems related to
these methods involve the use and handling of equipment in the field, the
present study aims to fill the need for a method for measuring SSR that is
more reliable, low-cost and convenient in the field than traditional field
methods. Shadow analysis, which interprets micro-topographic shadows, is
based on the principle that there is a direct relationship between the soil
surface roughness and the shadows cast by soil structures under fixed
sunlight conditions. SSR was calculated with shadows analysis in the
laboratory using hemispheres of different diameter with a diverse
distribution of known altitudes and a surface area of 1 m2.
Data obtained from the shadow analysis were compared to data obtained with
the chain method and simulation of the micro-relief. The results show a
relationship among the SSR calculated using the different methods. To
further improve the method, shadow analysis was used to measure the SSR in a
sandy clay loam field using different tillage tools (chisel, tiller and
roller) and in a control of 4 m2 surface plots divided into subplots of
1 m2. The measurements were compared to the data obtained using the
chain set and pin meter methods. The SSR measured was the highest when the
chisel was used, followed by the tiller and the roller, and finally the
control, for each of the three methods. Shadow analysis is shown to be a
reliable method that does not disturb the measured surface, is easy to
handle and analyse, and shortens the time involved in field operations by a
factor ranging from 4 to 20 compared to well known techniques such as the
chain set and pin meter methods. |
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