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Effects of 20 years of litter and root manipulations on soil organic matter dynamics

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dc.contributor.advisor Lajtha, Kate
dc.creator Wig, Jennifer D.
dc.date.accessioned 2012-06-20T22:16:55Z
dc.date.available 2012-06-20T22:16:55Z
dc.date.copyright 2012-05-02
dc.date.issued 2012-05-02
dc.identifier.uri http://hdl.handle.net/1957/30031
dc.description Graduation date: 2012 en_US
dc.description.abstract Globally, the forestry sector is the second largest contributor of greenhouse gases, and sustainable forest management is a major target of international environmental policy. However, there is the assumption underlying many policy recommendations that an increase in above-ground carbon stocks correspond to long term increases in ecosystem carbon stocks, the majority of which is stored in soils. We analyzed soil carbon and nitrogen dynamics in forest soils that had undergone twenty years of organic inputs manipulations as part of the Detritus Input and Removal Treatment (DIRT) network. There was no statistically significant effect of the rate of litter or root inputs on the carbon or nitrogen in bulk soil, on respiration rates of soil in laboratory incubations, on the non-hydrolyzed fraction of soil organic matter, or on any organic matter associated with any density. However, there is evidence for positive priming due to increased litter inputs; doubling the rate of litter inputs decreased C and N contents of bulk soil and decreased respiration rates of soil. Furthermore, there is evidence that roots influence soil organic matter dynamics more strongly than above-ground inputs. Both of these results trends match data from other DIRT sites, and are supported by the literature. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Soils and climate en_US
dc.subject.lcsh Soils -- Carbon content en_US
dc.subject.lcsh Soils -- Organic compound content en_US
dc.subject.lcsh Soils -- Nitrate content en_US
dc.subject.lcsh Forest litter en_US
dc.subject.lcsh Carbon sequestration en_US
dc.title Effects of 20 years of litter and root manipulations on soil organic matter dynamics en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Forest Science en_US
dc.degree.level Master's en_US
dc.degree.discipline Forestry en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Kleber, Markus
dc.contributor.committeemember Bond, Barbara
dc.contributor.committeemember Below, Amy
dc.description.peerreview no en_us

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