Show simple item record Manzoni, S Katul, GG Porporato, A 2011-06-21T17:22:07Z 2009-01-01
dc.identifier.citation Journal of Geophysical Research: Biogeosciences, 2009, 114 (4)
dc.identifier.issn 0148-0227
dc.description.abstract The long-term soil carbon dynamics may be approximated by networks of linear compartments, permitting theoretical analysis of transit time (i.e., the total time spent by a molecule in the system) and age (the time elapsed since the molecule entered the system) distributions. We compute and compare these distributions for different network. configurations, ranging from the simple individual compartment, to series and parallel linear compartments, feedback systems, and models assuming a continuous distribution of decay constants. We also derive the transit time and age distributions of some complex, widely used soil carbon models (the compartmental models CENTURY and Rothamsted, and the continuous-quality Q-Model), and discuss them in the context of long-term carbon sequestration in soils. We show how complex models including feedback loops and slow compartments have distributions with heavier tails than simpler models. Power law tails emerge when using continuous-quality models, indicating long retention times for an important fraction of soil carbon. The responsiveness of the soil system to changes in decay constants due to altered climatic conditions or plant species composition is found to be stronger when all compartments respond equally to the environmental change, and when the slower compartments are more sensitive than the faster ones or lose more carbon through microbial respiration. Copyright 2009 by the American Geophysical Union.
dc.language.iso en_US en_US
dc.relation.ispartof Journal of Geophysical Research: Biogeosciences
dc.relation.isversionof 10.1029/2009JG001070
dc.title Analysis of soil carbon transit times and age distributions using network theories
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US 2009-12-30 en_US
duke.description.endpage G04025 en_US
duke.description.issue en_US
duke.description.startpage G04025 en_US
duke.description.volume 114 en_US
dc.relation.journal Journal of Geophysical Research-Biogeosciences en_US
pubs.issue 4
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Nicholas School of the Environment
pubs.organisational-group /Duke/Nicholas School of the Environment/Environmental Sciences and Policy
pubs.organisational-group /Duke/Pratt School of Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Civil and Environmental Engineering
pubs.publication-status Published
pubs.volume 114

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