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dc.contributor.authorNichols, Lara Kaitlinen_US
dc.date.accessioned2015-04-30T06:00:08Z
dc.date.available2015-04-30T06:00:08Z
dc.date.issued2013-11-05en_US
dc.identifier.othervt_gsexam:1653en_US
dc.identifier.urihttp://hdl.handle.net/10919/51945
dc.description.abstractThe components of soil CO2 efflux are affected by many soil properties including temperature, moisture, microbial abundance and activity, and other soil physical and chemical properties. Changes in these factors can result in high spatial and temporal variability of total soil CO2 efflux. Low molecular weight organic acids (LMWOAs), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), microbial biomass and activity were measured to evaluate the impact of intercropping switchgrass (Panicum virgatum L.) in a loblolly pine (Pinus taeda L.) plantation. Surface soil samples (0-15 cm) were collected on the bed (PSG-B), interbed (PSG-I) and edge (PSG-E) of pine-switchgrass intercropped treatments, as well as pine only (P-B) and switchgrass only (SG-I) treatments. Differences in most soil properties and processes of intercropped treatments were sporadic and most did not show clear trends. However, significant correlations between DOC, soil temperature, oxalic and acetic acids and soil CO2 efflux were present. In an multiple regression model these factors explained 57% of the variance in total soil CO2 efflux. Therefore we think that LMWOAs, as a labile component of DOC, are influencing total CO2 efflux because they are being consumed by microbial community, increasing heterotrophic respiration and as a result overall total CO2 efflux. The amount and distribution of labile C controls microbial community dynamics, heterotrophic respiration as well as the stabilization of soil C.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectlow molecular weight organic acidsen_US
dc.subjectalley croppingen_US
dc.subjectcarbonen_US
dc.subjectbiofuelsen_US
dc.subjectsoil respirationen_US
dc.titleRelationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped Systemen_US
dc.typeThesisen_US
dc.contributor.departmentForest Resources and Environmental Conservationen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineForestryen_US
dc.contributor.committeechairStrahm, Brian Daleen_US
dc.contributor.committeechairFox, Thomas R.en_US
dc.contributor.committeememberSeiler, John R.en_US


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