HR: 14:55h
AN: H53H-06    [Abstracts]
TI: Separating Water Content Changes and Soil Texture Using Electromagnetic Induction Soil Imaging
AU: * Abdu, H
EM: hiruyabdu@cc.usu.edu
AF: Utah State University, Ag. Sci. Bldg. 158, Logan, UT 84322,
AU: Robinson, D A
EM: darob@stanford.edu
AF: Stanford University, 397 Panama Mall, Stanford, CA 94305,
AU: Jones, S B
EM: scott.jones@usu.edu
AF: Utah State University, Ag. Sci. Bldg. 158, Logan, UT 84322,
AB: The spatial distribution of soil texture is important for determining soil moisture storage and soil hydraulic transport properties. Electromagnetic induction (EMI) surveys of the soil apparent electrical conductivity (ECa) are being used to infer soil spatial heterogeneity at the field scale, due to their non-destructive nature, rapid response and ease of integration onto mobile platforms. The purpose of this study is to develop a procedure to non- invasively map field-scale soil texture patterns with minimal calibration and separate response due to water content change from static textural properties. Geo-referenced ECa measurements were taken using a DUALEM- 1S ground conductivity meter on multiple days with different field soil water contents on a 50 x 50 m field site at the Utah State University's Greenville Farm. Our results suggest that there are distinct zones with different textural properties and the lowest conductivity zone corresponds to observed gravelly area. Using temporal stability analysis these EMI maps reveal the spatial distribution of time-invariant subsurface properties and are informative for modeling and experimental design purposes in ecological, environmental and agricultural applications.
DE: 1865 Soils (0486)
DE: 1866 Soil moisture
DE: 1875 Vadose zone
DE: 1899 General or miscellaneous
SC: Hydrology [H]
MN: 2007 Fall Meeting