Soil Aggregate Structure Effects on Dielectric Permittivity of an Andisol Measured by Time Domain Reflectometry

摘要: Various types of soil physical properties are affected by texture and structure. Our objective was to determine aggregate structure effect on the dielectric property an Andisol measured time domain reflectometry (TDR). The relationships between volumetric water content (θ) permittivity (e) for both a wet-sieved its crushed sample were examined compared. In θ–e relationship 0.1- 2.0-mm-diam. aggregates, gradient curve moderately changed at (critical content), although this disappeared when we Furthermore, critical value corresponded plateau in bimodal-type retention curve. We suggest that effects soil9s involved sizes, configuration processes filling intra- interaggregate pores, low e bound adsorbed surfaces.