Problems arising from fixed-depth assessment of deeply weathered sandy soils

Influence of soil pattern on matter transport in and from terrestrial biogeosystems—A new concept for landscape pedology

“…Catenary sequences of upslope Ferralsols grading into Podzols downslope (Lucas and Chauvel, 1992;Boulet et al, 1997)-a pedogenic process called "deferralitization" according to Nascimento et al (2004)-had been observed and analysed in tropical lowlands for a long time (Klinge, 1965;Andriesse, 1969;Bravard and Righi, 1989Dubroeucq and Volkoff, 1998;Thomas et al, 1999). Many of these Podzols are "E-Podzols", because thin spodic horizons were overlain by very thick eluvial E horizons (in literature often referred to as "Giant Podzols" or "white sands", Thompson, 1992;Harris et al, 2005). This morphology can be translated into high Fig.…”

A Billion Tons of Unaccounted for Carbon in the Southeastern United States

“…Question marks identify that DPC thickness and lateral continuity are not well constrained. The top of DPC is not parallel to the soil surface following Watts (1998), Daniels (), and Harris et al ().…”

“…Not only do these Psamments share DPC's distinct geomorphic setting (90% probability within 26 km of RSF, mean = 10.0 km, median = 4.7 km; dashed blue in Figure b), by definition they too are extremely coarse textured (Soil Survey Staff, ) and thus edaphically favorable to deep podzolization. Although regional MU‐DPC correlations are not universal, we contend that the shared geomorphic settings of B′h horizons, deep Bh horizons, and nonlithic Psamments (Figures and a) alongside long‐standing soil‐landscape interpretations (Daniels, ; Gaston et al, ; Harris et al, ; Watts, ; Figure b) identify more than 4.6 × 10 −6 ha conducive to DPC in the Coastal Plain.…”

Seasonal change in thick regolith hardness and water content in a dry evergreen forest in Kampong Thom Province, Cambodia

“…Recently, however, some soil scientists have sought to understand the longneglected deep regolith zone, including saprolites of various kinds of rocks, deeply weathered lateritic regoliths, and paleosols in loess. Their objectives have included studying deep regolith (Harris et al, 2005;Wysocki et al, 2005), soil hydrology and environmental quality (Lee and Gilkes, 2005;O'Green et al, 2005;Rabenhorst and Valladares, 2005;Schoeneberger and Wysocki, 2005), deep root systems (Nepstad et al, 1994;Canadell et al, 1996;Tanaka et al, 2004;Bornyasz et al, 2005;Schenk and Jackson, 2005), and geochemistry (McKay et al, 2005;Oh and Richter, 2005;Vepraskas, 2005).…”

“…In a study of deep regolith, Harris et al (2005) noted that important morphologic horizons (e.g., E horizons) were more than 2 m deep in some deeply weathered soils, resulting in inaccurate and disjointed spatial depictions of pedogenic relationships on a landscape scale. Wysocki et al (2005) argued that thickness of the soil C horizon could exceed thickness of the A and B horizons and contain unique morphological properties.…”