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• 15 <br />should be analyzed in terms of probability of events of a given intensity <br />and/or duration with full attention given to probabilities of sequential <br />stress events. Then, through emperical or theoretical research, one can <br />determine the adaptability and responses of the existing vegetation-soil <br />units to those stresses, and develop reclamation strategies accomodating <br />them. <br />Reconstruction of soil profiles using sewage sludge or other organic nu- <br />I trient storage media plus fertilizers or using carefully segregated and <br />handled soils from sites of accumulative surplus in swales and lee slopes <br />then becomes possible if planned to emulate naturally occuring and well <br />understood pre-disturbance conditions. <br />To accomplish this sort of analysis, one needs detailed soil mineralogy, <br />cation exchange analysis, pH, soluable salt, carbonate, organic matter, <br />and textural analyses as a function of depth as well as good understanding <br />of soil-vegetation units and plant ecology. In the shallow immature <br />northern great plains soils, sampling should reflect depth-integration at <br />no greater than 5-an intervals for the A-, B-, and upper C-horizons or <br />equivalents in azonal soils lacking textural B-horizons. One further needs <br />a detailed map of soil facies showing how depth and other characteristics <br />vary laterally over the areas to be impacted and over adjacent areas from <br />which living soil columns could be taken and 'grafted' to the reconstructed <br />areas to be reclaimed. <br />