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dc.contributor.authorBillings, Sharon A.
dc.contributor.authorRichter, Daniel de B.
dc.contributor.authorZiegler, Susan E.
dc.contributor.authorPrestegaard, Karen
dc.contributor.authorWade, Anna M.
dc.identifier.citationBillings SA, Richter DdB, Ziegler SE, Prestegaard K and Wade AM (2019) Distinct Contributions of Eroding and Depositional Profiles to Land-Atmosphere CO2 Exchange in Two Contrasting Forests. Front. Earth Sci. 7:36. doi: 10.3389/feart.2019.00036en_US
dc.descriptionThis work is licensed under a Creative Commons Attribution 4.0 International License.en_US
dc.description.abstractLateral movements of soil organic C (SOC) influence Earth's C budgets by transporting organic C across landscapes and by modifying soil-profile fluxes of CO2. We extended a previously presented model (Soil Organic C Erosion Replacement and Oxidation, SOrCERO) and present SOrCERODe, a model with which we can project how erosion and subsequent deposition of eroded material can modify biosphere-atmosphere CO2 fluxes in watersheds. The model permits the user to quantify the degree to which eroding and depositional profiles experience a change in SOC oxidation and production as formerly deep horizons become increasingly shallow, and as depositional profiles are buried. To investigate the relative importance of erosion rate, evolving SOC depth distributions, and mineralization reactivity on modeled soil C fluxes, we examine two forests exhibiting distinct depth distributions of SOC content and reactivity, hydrologic regimes and land use. Model projections suggest that, at decadal to centennial timescales: (1) the quantity of SOC moving across a landscape depends on erosion rate and the degree to which SOC production and oxidation at the eroding profile are modified as deeper horizons become shallower, and determines the degree to which depositional profile SOC fluxes are modified; (2) erosional setting C sink strength increases with erosion rate, with some sink effects reaching more than 40% of original profile SOC content after 100 y of a relatively high erosion rate (i.e., 1 mm y−1); (3) even large amounts of deposited SOC may not promote a large depositional profile C sink even with large gains in autochthonous SOC post-deposition if oxidation of buried SOC is not limited; and (4) when modeled depositional settings receive a disproportionately large amount of SOC, simulations of strong C sink scenarios mimic observations of modest preservation of buried SOC and large SOC gains in surficial horizons, suggesting that C sink scenarios have merit in these forests. Our analyses illuminate the importance of cross-landscape linkages between upland and depositional environments for watershed-scale biosphere-atmosphere C fluxes, and emphasize the need for accurate representations and observations of time-varying depth distributions of SOC reactivity across evolving watersheds if we seek accurate projections of ecosystem C balances.en_US
dc.publisherFrontiers Mediaen_US
dc.rightsCopyright © 2019 Billings, Richter, Ziegler, Prestegaard and Wade.en_US
dc.subjectFloodplain soilsen_US
dc.subjectCarbon fluxesen_US
dc.subjectSoil organic carbonen_US
dc.subjectDynamic replacementen_US
dc.subjectTerrestrial carbon sinken_US
dc.titleDistinct Contributions of Eroding and Depositional Profiles to Land-Atmosphere CO2 Exchange in Two Contrasting Forestsen_US
kusw.kuauthorBillings, Sharon A.
kusw.kudepartmentEcology and Evolutionary Biologyen_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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Copyright © 2019 Billings, Richter, Ziegler, Prestegaard and Wade.
Except where otherwise noted, this item's license is described as: Copyright © 2019 Billings, Richter, Ziegler, Prestegaard and Wade.