Poster Number 21
See more from this Division: Joint Sessions
See more from this Session: Desert Pavements and Vesicular A Horizons (Posters)
Abstract:
VHI = T(Sp*Qp + Spl*Gpl + Scol*Gcol)
Where VHI = vesicular horizon index, T = horizon thickness (in cm), Sp = size class of vesicular pores (assigned 1-5 for vf-vco), Qp = quantity class of vesicular pores, Spl = size class of platy structure (assigned 1-5 for vco-vf), Gpl = grade of platy structure, Scol = size class of columnar of prismatic structure (assigned 1-5 for vco-vf), Gcol=grade of columnar or prismatic structure. More terms for pores and structure (e.g.,Sp*Qp for pores) are added if more than one size class is described. If more than one vesicular horizon is described the VHIs are added to determine the total VHI for the soil. The index was found to increase with age of the geomorphic surface (0.2 ka-130 ka) at several chronosequence sites and the index was higher for finer textured vesicular horizons. The index developed in this study is a simple way of quantifying vesicular horizon development, which has potential applications in relating soil morphology to hydrologic and ecological functions of desert soils and landscapes.
See more from this Division: Joint Sessions
See more from this Session: Desert Pavements and Vesicular A Horizons (Posters)