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| Titel |
Spatial variability of soil properties and soil erodibility in the Alqueva reservoir watershed |
| VerfasserIn |
V. Ferreira, T. Panagopoulos, R. Andrade, C. Guerrero, L. Loures |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 2 ; Nr. 6, no. 2 (2015-04-09), S.383-392 |
| Datensatznummer |
250115437
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| Publikation (Nr.) |
 copernicus.org/se-6-383-2015.pdf |
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| Zusammenfassung |
| The aim of this work is to investigate how the spatial variability of soil
properties and soil erodibility ($K$ factor) were affected by the changes in
land use allowed by irrigation with water from a reservoir in a semiarid
area. To this end, three areas representative of different land uses
(agroforestry grassland, lucerne crop and olive orchard) were studied within
a 900 ha farm. The interrelationships between variables were analyzed by
multivariate techniques and extrapolated using geostatistics. The results
confirmed differences between land uses for all properties analyzed, which
was explained mainly by the existence of diverse management practices
(tillage, fertilization and irrigation), vegetation cover and local soil
characteristics. Soil organic matter, clay and nitrogen content decreased
significantly, while the K factor increased with intensive cultivation. The
HJ-Biplot methodology was used to represent the variation of soil
erodibility properties grouped in land uses. Native grassland was the least
correlated with the other land uses. The K factor demonstrated high correlation
mainly with very fine sand and silt. The maps produced with geostatistics
were crucial to understand the current spatial variability in the Alqueva
region. Facing the intensification of land-use conversion, a sustainable
management is needed to introduce protective measures to control soil
erosion. |
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