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dc.contributor.authorLajtha, Kate
dc.contributor.authorBowden, Richard D.
dc.contributor.authorNadelhoffer, Knute
dc.date.accessioned2018-07-12T16:17:06Z
dc.date.available2018-07-12T16:17:06Z
dc.date.issued2014-08-18
dc.identifier.citationLajtha, K., Bowden, R.D., and Nadelhoffer, K. (2014). Litter and Root Manipulations Provide Insights into Soil Organic Matter Dynamics and Stability. Soil Science Society of America, 78: S261-S269. doi:10.2136/sssaj2013.08.0370nafsc.en_US
dc.identifier.issn0361-5995
dc.identifier.issne1435-0661
dc.identifier.urihttp://hdl.handle.net/10456/46633
dc.description.abstractUnderstanding controls on C stored in soil organic matter (SOM) is of critical importance to models of biospheric C sequestration. Although ecosystem C models assume a strong relationship between plant litter inputs and soil C accumulation, there is little experimental evidence to support this assumption. The Detritus Input and Removal Treatments (DIRT) experiment at Harvard Forest was designed to assess how rates and sources of plant litter inputs control the accumulation and dynamics of organic matter in soils across decadal time scales. Carbon and SOM quantity and quality were measured in O horizon and mineral soil in five treatments: control, double litter, no litter, no roots, and no inputs. After 20 yr of manipulation, doubling litter inputs did not increase bulk soil C or N content, light or heavy fraction pools of C, or measures of labile C. However, the activities of two key enzymes (b-glucosidase and phosphomonoesterase) increased 30% with litter additions. Exclusion of either aboveground litter or root inputs resulted in sharp declines in O-horizon C and N but smaller decreases in total mineral soil C and N. However, decreases in light fraction C and soil respiration were significant in removal treatments. Litter exclusion resulted in an 18% decline in total profile mineral soil C, whereas root exclusion resulted in a 9% decline, indicating the importance of aboveground inputs to long-term C pools. Soil C pools in this forest do not respond linearly or immediately to aboveground or belowground litter inputs, and thus efforts to sequester C by managing productivity and associated litter inputs will probably not result in increased C storage in short time frames.en_US
dc.language.isoen_USen_US
dc.publisherSoil Science Society of Americaen_US
dc.relation.ispartofSoil Science Society of Americaen_US
dc.relation.isversionofhttp://harvardforest.fas.harvard.edu/sites/harvardforest.fas.harvard.edu/files/publications/pdfs/Lajtha_SoilSci_2014.pdfen_US
dc.rightsThis article is published by the Soil Science of America in Soil Science of Science America Journal (2014) Lajtha, Bowden, and Nadelhoffer. All rights reserved.en_US
dc.titleLitter and Root Manipulations Provide Insights into Soil Organic Matter Dynamics and Stabilityen_US
dc.title.alternateNorth American Forest Soils Conference Proceedingsen_US
dc.description.versionPublished articleen_US
dc.contributor.departmentBiologyen_US
dc.citation.volume78en_US
dc.citation.spageS261en_US
dc.citation.epageS269en_US
dc.identifier.doi10.2136/sssaj2013.08.0370nafsc
dc.contributor.avlauthorBowden, Richard D.


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