Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"University of Arizona" +contributor:("Hutchinson, C. F."). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Arizona

1. Turner, Georgia Reavis. Reflectance and temperature characteristics of semiarid rangeland surfaces .

Degree: 1984, University of Arizona

Spectral and surface temperature measurements were made of various rangeland surface conditions using a hand-held radiometer and an infrared thermometer. Three different soil series, each with three plots with varying surface conditions were studied. T-tests, simple-linear regression analysis, and principal components analysis were used to relate rangeland surface features to spectral and thermal measurements. Vegetation was the feature that had the most effect on surface temperature under dry conditions, and vegetated plots had a lower percent change in daily temperature than bare plots. Under wet conditions, there were no significant differences in temperature between plots with differing surface conditions. Correlation coefficients showed that the hue of the soil was highly correlated with the percent reflectance in all four spectral bands, and the green grass cover decreased the reflectance in bands one, two and three. There were high correlation levels among the spectral bands showing an overlap of spectral information. Advisors/Committee Members: Matthias, Allan D. (committeemember), Hutchinson, C. F. (committeemember).

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Turner, G. R. (1984). Reflectance and temperature characteristics of semiarid rangeland surfaces . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/191808

Chicago Manual of Style (16th Edition):

Turner, Georgia Reavis. “Reflectance and temperature characteristics of semiarid rangeland surfaces .” 1984. Masters Thesis, University of Arizona. Accessed August 19, 2019. http://hdl.handle.net/10150/191808.

MLA Handbook (7th Edition):

Turner, Georgia Reavis. “Reflectance and temperature characteristics of semiarid rangeland surfaces .” 1984. Web. 19 Aug 2019.

Vancouver:

Turner GR. Reflectance and temperature characteristics of semiarid rangeland surfaces . [Internet] [Masters thesis]. University of Arizona; 1984. [cited 2019 Aug 19]. Available from: http://hdl.handle.net/10150/191808.

Council of Science Editors:

Turner GR. Reflectance and temperature characteristics of semiarid rangeland surfaces . [Masters Thesis]. University of Arizona; 1984. Available from: http://hdl.handle.net/10150/191808


University of Arizona

2. CHADWICK, OLIVER AUSTIN. INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS).

Degree: 1985, University of Arizona

Silica cemented pedogenic horizons known as duripans occur on relict landforms in climates having limited leaching potential. Under the influence of tephra, incipient silica cementation may also occur in late Quaternary soils. The source of silica for cementation in Holocene soils is rapidly weatherable volcanic glass. In response to wetting and drying cycles volcanic glass weathers to form sand-size composite particles composed of silt, clay and redeposited silica. A portion of the hydrolyzed silica is eluviated as monosilicic acid which accumulates as the wetting front evaporates. Illuvial silica augments existing composite particles eventually forming a continuously cemented duripan. In actively forming late Quaternary soils, the cementation process is a complex interaction between illuvial silica, clay and calcium carbonate and the soil matrix. Surface reactions between monosilicic acid and illuvial clay or soil matrix particles provide nucleation sites for polymerization of silica concentrated by evaporation. The resulting opaline silica bonds adjacent soil grains without necessarily plugging intervening pore spaces. In contrast, calcium carbonate preferentially precipitates in large pores and interped voids. Cementation occurs by the plugging of progressively smaller pores with relatively pure calcite rather than by heterogeneous bonding of mineral grains. In illuvial zones containing both silica and calcium carbonate, cementation may occur rapidly because the former holds small soil particles in place while the latter plugs large pores. The mineralogy of silica cement is determined by identification of varying amounts of crystal order using X-ray diffraction. Opal-A is recently polymerized, noncrystalline, highly hydrated silica gel. The more prevalent, partly crystalline opal-CT forms where surface reaction with clays create crystal orientation, where silica gel dehydrates or when silica precipitates from soil solutions having high concentrations. Advisors/Committee Members: Hendricks, D. M (advisor), Bull, W. B. (committeemember), Post, D. F. (committeemember), Hutchinson, C. F. (committeemember), Baker, V. R. (committeemember).

Subjects/Keywords: Duricrusts.; Soil formation.; Alluvium.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

CHADWICK, O. A. (1985). INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS). (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/187945

Chicago Manual of Style (16th Edition):

CHADWICK, OLIVER AUSTIN. “INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS). ” 1985. Doctoral Dissertation, University of Arizona. Accessed August 19, 2019. http://hdl.handle.net/10150/187945.

MLA Handbook (7th Edition):

CHADWICK, OLIVER AUSTIN. “INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS). ” 1985. Web. 19 Aug 2019.

Vancouver:

CHADWICK OA. INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS). [Internet] [Doctoral dissertation]. University of Arizona; 1985. [cited 2019 Aug 19]. Available from: http://hdl.handle.net/10150/187945.

Council of Science Editors:

CHADWICK OA. INCIPIENT SILICA CEMENTATION IN CENTRAL NEVADA ALLUVIAL SOILS INFLUENCED BY TEPHRA (DURIPAN, TAXONOMY, OPAL-CT, GENESIS). [Doctoral Dissertation]. University of Arizona; 1985. Available from: http://hdl.handle.net/10150/187945

.