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| Titel |
Geoestatistical analysis of soil properties in the South of Alicante: soil salinity. |
| VerfasserIn |
I. Melendez-Pastor, H. Ayguadé, A. Lag, J. Navarro-Pedreño, I. Gómez |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041277
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| Zusammenfassung |
| The southern coast of Alicante province (southeast of Spain) was largely occupied by a large
lagoon until the eighteenth century when drainage infrastructures were built to turn much of
the wetlands into irrigated farmlands. This area has a semiarid Mediterranean climate
and the shortage of sufficient quality water for irrigation is a serious problem for
agriculture and wetland maintenance. This study analyzes the spatial distribution of
soil properties and their relationship with land-covers by the use of geostatistics
and geographical information systems (GIS) as a tool for land-reclamation and
management.
A field campaign was conducted and 98 soil samples were collected and spatially
referenced with a GPS. Soils of the study area are Calcic Fluvisols according to the World
Reference Base for Soil Resources (WRB, 2006). Soil samples were air dried at room
temperature and sieve at 2mm (soil fraction to be analysed). Four soil properties were
analysed: 1) electrical conductivity (EC) (1:5 w/v water extraction), 2) pH, 3) equivalent
carbonates (Porta et al., 1986), and 4) soil organic matter (SOM) by wet chemical oxidation
(Walkley and Black, 1934) with potassium dichromate oxidation (Nelson and Sommers,
1982). Geostatistics was used to model the spatial distribution of soil properties. The convex
hull of soil samples was used to delimit the area to map. Semivariograms were applied to
study the spatial pattern of the four soil properties and ordinary Kriging was used to predict
their spatial distribution.
Descriptive statistics (mean ± standard deviation) showed that in general terms the soils
studied was moderately saline (2.44 ± 0.32 dS-
m-1), with a basic pH (8.22 ± 0.32), low soil
organic matter content (1.41 ± 0.37 %) and abundant equivalent carbonates (46.1 ± 4.3 %).
Electrical conductivity, pH and SOM properties were significantly correlated according with
the Pearson bivariate correlation test (with P4 dS-
m-1) or non-saline (EC |
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