Titre :
|
A geostatistical method for soil salinity sample site spacing
|
Auteurs :
|
A. Utset ;
M. Ruiz ;
J. Herrera ;
AL Et
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1998
|
Format :
|
p. 143-151
|
Langues:
|
= Anglais
|
Catégories :
|
SCIENCES FONDAMENTALES ET APPLIQUEES
|
Mots-clés:
|
SALINITE DU SOL
;
GEOSTATISTIQUE
;
CARTOGRAPHIE
;
CONDUCTIVITE ELECTRIQUE
;
MESURE
|
Résumé :
|
A calibrated Four-Electrode Probe (FEP) was used for inexpensive and indirect determinations of salinity-sensor Electrical Conductivity (EC) in a plot at Cauto Valley, Cuba. Two transects were made in the North-South (N-S) and East-West (E-W) directions. Laboratory measurements of soil EC were also made from samples taken on a 50-m spaced square grid. A linear semivariogram was obtained for the salinity-sensor EC measurements at the E-W transect, which agrees with the topographical slope of the plot and with the expected soil salinity variation. It also coincides with the spatial structure of laboratory-measured soil EC. A cross-validation analysis has shown that EC semivariograms obtained from FEP measurements can characterize the soil EC spatial variation in a similar way as semivariograms of laboratory-measured soil EC. Thus, the distance between samples for soil salinity maps can be based on the semivariogram's range of salinity-sensor EC measurements.
|
Source :
|
Geoderma, vol.86
|