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United States Department of Agriculture (USDA) 2011

CORRELATING SOIL-LANDSCAPE CHANGES TO MAJOR DROUGHTS DURING THE LATE QUATERNARY

Changes Drought Quaternary

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : CORRELATING SOIL-LANDSCAPE CHANGES TO MAJOR DROUGHTS DURING THE LATE QUATERNARY

Identification : OKL01892

Pays : Etats Unis

Durée : Oct 1, 2011 à Sep 30, 2016

Mots clés : delta 13 ; stratigraphy and soil morphology ; landscape development geoarchaeology ; climate change ; buried soils ; radiocarbon agelate pleistocene and holocene ; soil forming factors and processes

Partenaire : OKLAHOMA STATE UNIVERSITY STILLWATER,OK 74078

Objectifs
Hypotheses include : adjacent soil mapping units within aeolian-derived landscapes will contain distinct age-specific parent materials recognizable and distinguishable by the degree of soil development of the major soil series components ; also, these soil series components of age-specific parent materials will form a climatic soil catena across the humid to semi arid environments of the Southern Plains. Three objectives addressing these hypotheses : OSL and RC ages for aeolian parent and alluvial materials provide an opportunity to correlate 1) soil development and age of soil parent materials, 2) soil mapping units and periods of climate change during late Pleistocene and Holocene, and 3) past human occupations and their use of complex fragile soil environments

Descriptif
Sixteen study sites will be selected in cooperation with soil scientists from the Southern High Plains (MLRA 77C), Central Rolling Red Plains (MRLA 78C), Central Rolling Red Prairies (MLRA 80A), and the Northern Cross Timbers (MLRA 84A) representing a west to east transect along two major river drainage systems (North Canadian (Beaver) and Cimarron). These drainage systems are sources for wind-blown soil parent materials. Soils from currently identified distinct soil mapping units will be described and sampled at four study sites (a projected soil chrono-sequence - within each area) and across areas (west to east transect ; a projected soil climatic sequence) based on the degree of soil formation of principle map-unit components. OSL and RC age determinations will form the basis for soil sequence comparisons. Sites will be selected after careful review and critique by NRCS soil scientists to ensure that the soils sampled represent benchmark and central landscape/age concepts. Soil profiles for each of the 16 sites will be described in detail with the help and overview of NRCS soil scientist. Key soil properties will be determined (whole profile ; by horizon for TOC, PSA, and CCE) along with OSL/RC age (from greater than 125 cm below ground surface or buried soil). A soil development index will be created by combining soil profile characteristics (e.g., horizon type and thickness) and key soil properties (TOC, clay content and translocation, and CCE (carbonate formation)) and used to make comparison between soils from chrono- and climatic sequence

Présentation : USDA

Page publiée le 23 novembre 2015, mise à jour le 12 novembre 2017