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Thirty-year Changes in Mineral Soil C in a Cumberland Plateau Forest as Influenced by Inorganic-N, Soil Texture, and Topography

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dc.contributor.authorKiser, Larry Christopheren
dc.contributor.committeechairKelly, J. Michaelen
dc.contributor.committeememberBurger, James A.en
dc.contributor.committeememberFox, Thomas R.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T20:48:00Zen
dc.date.adate2008-01-09en
dc.date.available2014-03-14T20:48:00Zen
dc.date.issued2007-10-31en
dc.date.rdate2008-01-09en
dc.date.sdate2007-11-16en
dc.description.abstractIncreases in atmospheric C have resulted in concerns about global warming and interest in finding means to sequester atmospheric C through land management strategies. The purpose of this study was to (i) compare changes in mineral soil C after a 30-year interval and (ii) examine the role of inorganic-N, soil texture, and topography in these changes. Soil samples were collected at permanently identified points on the Camp Branch Watershed, a second growth oak forest on the Cumberland Plateau in central Tennessee, in July of 1976 and archived. These points were re-sampled in July of 2006 and both archived and new samples of the 0 to 10 cm increment of the mineral soil were analyzed for C and N using the same procedures. Paired comparisons revealed changes in C and N were distinct to each of the 8 soil series. Comparison of 2006 samples to 1976 samples indicated changes in C concentration ranged from -13.1% to +12.0%. Changes in C mass ranged from -11.3% to +8.3%. Increases in C were most closely associated with increases in the C/total-N ratio. C was positively correlated to exchangeable inorganic-N in 1976 (r2 = 0.387) and 2006 (r2 = 0.107). Regression analysis revealed C increased with increasing azimuth and decreasing elevation in 1976 (r2 = 0.140). C was predicted only by clay content in 2006 (r2 = 0.079) and exhibited a negative relationship. Since topography was no longer a predictor of mineral soil C in 2006, we speculate that changes in forest cover also influenced changes in mineral soil C.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-11162007-160043en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11162007-160043/en
dc.identifier.urihttp://hdl.handle.net/10919/35725en
dc.publisherVirginia Techen
dc.relation.haspartThesis_LCKISERrev.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcarbon sequestrationen
dc.subjectaggradingen
dc.subjecttemperate deciduous foresten
dc.titleThirty-year Changes in Mineral Soil C in a Cumberland Plateau Forest as Influenced by Inorganic-N, Soil Texture, and Topographyen
dc.typeThesisen
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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