Geogenesis, pedogenesis, and multiple causality in the formation of texture-contrast soils Export

@article{PhillipsJD2004, abstract = {Coarse-over-fine vertical texture contrasts (VTC) are common in soils and weathering profiles in a variety of environmental settings, including many where inheritance or surficial processes alone cannot account for them. A multiple causality model is presented here which shows that texture contrasts can form in response to a combination of ubiquitous phenomena. There are six key elements: downward translocation by water, erosional winnowing, soil mixing by bioturbation, the tendency for surface clay additions to be mobilized while subsurface clays are more likely to remain in place, and biological facilitation of moisture flux. No element alone is sufficient to create a VTC, but not all are necessary in any given regolith. The model is illustrated by application to case studies in the Ouachita Mountains, Arkansas; ridgetops in eastern Kentucky; the lower coastal plain of North Carolina; and the upper coastal plain of east Texas. The implications for interpretation of soils, paleosols, and weathering profiles is that the presence of a textural contrast, by itself, does not connote any particular set of geogenic or pedogenic processs or controls. Texture contrasts may be geogenic, pedogenic, or both. Given the widespread occurrence of the mechanisms of the multiple causality model, vertical texture contrasts are inevitable.}, author = {Phillips, Jonathan D.}, citeulike-article-id = {528295}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.catena.2004.04.002}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6VCG-4D0Y74D-1/2/4922ef235ef710f064a68ddca80e886f}, day = {10}, doi = {10.1016/j.catena.2004.04.002}, journal = {CATENA}, keywords = {causality, contrasts, model, multiple, profile, regolith, soil, texture, vertical, weathering}, month = {December}, number = {3}, pages = {275--295}, posted-at = {2008-04-13 12:11:23}, priority = {2}, title = {Geogenesis, pedogenesis, and multiple causality in the formation of texture-contrast soils}, url = {http://dx.doi.org/10.1016/j.catena.2004.04.002}, volume = {58}, year = {2004} }

TY - JOUR ID - PhillipsJD2004 L3 - citeulike-article-id:528295 N2 - Coarse-over-fine vertical texture contrasts (VTC) are common in soils and weathering profiles in a variety of environmental settings, including many where inheritance or surficial processes alone cannot account for them. A multiple causality model is presented here which shows that texture contrasts can form in response to a combination of ubiquitous phenomena. There are six key elements: downward translocation by water, erosional winnowing, soil mixing by bioturbation, the tendency for surface clay additions to be mobilized while subsurface clays are more likely to remain in place, and biological facilitation of moisture flux. No element alone is sufficient to create a VTC, but not all are necessary in any given regolith. The model is illustrated by application to case studies in the Ouachita Mountains, Arkansas; ridgetops in eastern Kentucky; the lower coastal plain of North Carolina; and the upper coastal plain of east Texas. The implications for interpretation of soils, paleosols, and weathering profiles is that the presence of a textural contrast, by itself, does not connote any particular set of geogenic or pedogenic processs or controls. Texture contrasts may be geogenic, pedogenic, or both. Given the widespread occurrence of the mechanisms of the multiple causality model, vertical texture contrasts are inevitable. IS - 3 JF - CATENA EP - 295 TI - Geogenesis, pedogenesis, and multiple causality in the formation of texture-contrast soils VL - 58 SP - 275 KW - causality KW - contrasts KW - model KW - multiple KW - profile KW - regolith KW - soil KW - texture KW - vertical KW - weathering AU - Phillips, Jonathan PY - 2004/12/10/ UR - http://dx.doi.org/10.1016/j.catena.2004.04.002 ER -