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Biogeochemical calcium cycling of Andropogon scoparius Michx. in two contrasting soil types
dc.contributor.advisor | Dodd, J. D. | |
dc.creator | Waller, Steven Scobee | |
dc.date.accessioned | 2020-08-21T21:01:28Z | |
dc.date.available | 2020-08-21T21:01:28Z | |
dc.date.issued | 1975 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/DISSERTATIONS-184743 | |
dc.description.abstract | Techniques of dry ashing plant material and column extracting soil material were developed to convert ⁴⁵Ca to a chloride salt. Calcium-45 recovery efficiency was approximately 90% for plant material and 95% for soil. Movement and distribution within Andropogon scoparius Michx. tillers, clones, and associated ecosystems were investigated in greenhouse and field studies using ⁴⁵Ca as a tracer. Two contrasting soil types, Heiden-Hunt clay and Tabor fine sandy loam, were utilized. Calcium-45 introduction was achieved by both foliar and soil application techniques. Initial movement of foliar applied ⁴⁵Ca was rapid in greenhouse-grown tillers. Movement from point of introduction was basipetal and acropetal with activity observed in every tiller compartment and the soil within 1 hour following isotope introduction. Temporary redistribution was observed between leaf and sheath (major compartments of accumulation) during 100.5 hr following isotope introduction. Over time ⁴⁵Ca was immobilized and accumulated in the leaf, sheath, and senescent material. Calcium in the sheath was remobilized and transported to developing seed culms. Field studies indicated ⁴⁵Ca distribution within clonal tillers was similar to that observed in greenhouse-grown tillers. Over 56% of foliar applied ⁴⁵Ca had been transferred from clay-grown clones to the soil compartment while 11% was in the associated vegetation compartment after 4 mo. The sand soil compartment contained over 63% of the total applied activity with 8% in the associated vegetation compartment. At the end of the second growing season, the soil compartment contained about 85% of the applied ⁴⁵Ca, regardless of soil type. An active calcium cycle on the clay ecosystem was not identified, while a rapid cycle was documented on the sand ecosystem.. | en |
dc.format.extent | 141 leaves | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Range Science | en |
dc.subject.classification | 1975 Dissertation W198 | |
dc.title | Biogeochemical calcium cycling of Andropogon scoparius Michx. in two contrasting soil types | en |
dc.type | Thesis | en |
thesis.degree.discipline | Range Science | en |
thesis.degree.grantor | Texas A&M University | en |
thesis.degree.name | Doctor of Philosophy | en |
thesis.degree.name | Ph. D. in Range Science | en |
thesis.degree.level | Doctorial | en |
dc.type.genre | dissertations | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
dc.publisher.digital | Texas A&M University. Libraries | |
dc.identifier.oclc | 5782090 |
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