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University of Arizona (1993)

Small-scale spatial variability of soil moisture and hydraulic conductivity in a semi-arid rangeland soil in Arizona

Whitaker, Martha Patricia Lee

Titre : Small-scale spatial variability of soil moisture and hydraulic conductivity in a semi-arid rangeland soil in Arizona.

Auteur : Whitaker, Martha Patricia Lee

Université de soutenance : University of Arizona.

Grade : Master of Science (MS) 1993

Résumé
The correlation scales of soil moisture and hydraulic conductivity were investigated within a 4.4 hectare semi-arid rangeland watershed using measurements obtained from time domain reflectometry and disc permeameters, respectively. Soil moisture measurements were collected at four different times in 1991 to yield a varied set of natural soil moisture conditions. Soil moisture was sampled over a 30 meter grid, two perpendicular transects at 5 meter intervals, once at 1 meter intervals, and once at intervals of — 0.10 m within a 1 xl meter plot. Variogram functions showed evidence of spatial correlation only when the grid and perpendicular transect data were combined. A total of 30 measurements each of saturated and unsaturated hydraulic conductivity were collected along a 300 meter curvilinear transect at approximately 10 meter intervals. Although spatial correlation was evident, variogram resolution may possibly be improved by obtaining more measurements.

Mots clés : Soil moisture — Arizona. — Soils — Arid regions.

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Page publiée le 17 mai 2012, mise à jour le 23 février 2018