Graduate Thesis Or Dissertation
 

Correspondence of soil properties and classification units with sagebrush communities in southeastern Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2j62s7748

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  • This research employed multivariate analytical techniques to statistically examine the relationship between individual soillandscape units (SLUs) in Southeastern Oregon and their associated sagebrush communities. The objective was to determine if soil properties between SLUs differed, describe the variation, and verify that these differences were reflected in the taxonomic class of soils representing each SLU. Several strategies for developing a profile concept which accurately summarized and typified morphological data collected from each SLU were compared. Statistical evaluations of soil profiles exhibiting diverse horizonation were accomplished by grouping profile subhorizons into aggregate strata, termed super-horizon-categories, which were defined to be common to all profiles. Two procedures were utilized to appraise soil variability between SLUs: 1) Principal component analysis and hierarchical analysis of variance examined components of variance at each level in the sampling design. 2) Discriminant analysis, multivariate analysis of variance, and Bonferroni's simultaneous confidence intervals were employed to select relevant soil parameters, test equality of group mean vectors, and construct specific between-group comparisons, respectively. In Part one, geographically separate mono-taxa SLUs that supported different Artemisia habitat types were compared. Those factors which varied most highly between SLUs included elevation, aspect, presence of E or BA subhorizons, clay content of Bt horizon, and sand content of surface strata. In Part two, polypedons within a multitaxa SLU that supported different phases of an Artemisia arbuscula/ Festuca idahoensis habitat type were compared. In this case, soil parameters which best distinguished between polypedons included depth of mollic epipedon, surface rock fragment cover, and thickness and average dry consistence of the Bt horizon. In both studies, series separations between soil bodies.supporting different plant communities were justified. Differentia included family or class distinctions of higher categories or differences in horizon composition and range of soil properties. Differences between soils which were not detected at family or higher class levels included 1) presence or absence of transitional AB and BCt subhorizons, 2) volumetric rock fragment content of A and Bt horizons, 3) thickness of mollic epipedon, 4) structure of BAt subhorizon, 5) thickness, and 6) average dry consistence of Bt horizon. Structure type of subhorizons, positions of subhorizons in soil profiles relative to the soil surface, and nutrient content are properties of soils which are often neglected by soil surveyors, yet these characteristics may provide important discrimination between soils possessing different range potentials.
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  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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file details LentzRodrickD1985.pdf 2017-08-10 公开 下载