Groundwater salinity as a control on development of eolian landscape: An example from the White Sands of New Mexico

摘要: Abstract The White Sands of southern New Mexico form the largest field gypsum dunes in world. juxtaposition several different types within has long been recognized and generally attributed to changes rate sand transport across dune field. However, Steven Fryberger [Fryberger, S.G., 2003. Geology National Monument, web page www2.nature.nps.gov/geology/parks/whsa/ ] recently hypothesized, however, that a primary control is groundwater salinity. underlain by saline waters. proposed parabolic could topographic highs accumulated lens fresher water derived from precipitation. Water with lower salinity allowed vegetation grow, stabilized except for active noses dunes. This study test hypothesis. A transect was established boundary between barchan Groundwater soil at six sites were sampled during December, 2004 March, May, June 2005. Two field, two barchans, transition zone them. found be three times more area. Conductivity chloride decreased zone. GPS survey revealed abrupt steps, one barchans second edge second, larger step outside area defining higher These data indicate Fryberger's (2003) hypothesis correct controlling morphology. did not begin until Mid-Holocene (6500 years ago). compilation dates shows probably stable last 3500 years. In contrast, deflated exposed 2000 year old sediment near surface.