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Temporal Dynamics And Spatial Variability In The Enhancement Of Canopy Leaf Area Under Elevated Atmospheric CO2

by Fianna O'Brien - January 30, 2017

Increased canopy leaf area (L) may lead to higher forest productivity and alter processes such as species dynamics and ecosystem mass and energy fluxes. Few CO2 enrichment studies have been… More

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Transpiration In Response To Variation In Microclimate And Soil Moisture In Southeastern Deciduous Forests

by Fianna O'Brien - January 30, 2017

Responses of forests to changes in environmental conditions reflect the integrated behavior of their constituent species. We investigated sap flux-scaled transpiration responses of two species prevalent in upland eastern hardwood… More

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Elevated CO2 Differentiates Ecosystem Carbon Processes: Deconvolution Analysis Of Duke Forest FACE Data

by Fianna O'Brien - January 30, 2017

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Simulated Nitrogen Cycling Response To Elevated CO2 In Pinus Taeda And Mixed Deciduous Forests

by Fianna O'Brien - January 30, 2017

Interactions between elevated CO2 and N cycling were explored with a nutrient cycling model (NuCM, Johnson et al. 1993, 1995) for a Pinus taeda L. site at Duke University, North… More

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Gross Primary Productivity In Duke Forest: Modeling Synthesis Of CO2 Experiment And Eddy-Flux Data

by Fianna O'Brien - January 30, 2017

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Separating The Effects Of Albedo From Eco-Physiological Changes On Surface Temperature Along A Successional Chronosequence In The Southeastern United States

by Fianna O'Brien - January 30, 2017

In the southeastern United States (SE), the conversion of abandoned agricultural land to forests is the dominant feature of land-cover change. However, few attempts have been made to quantify the… More

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Impacts Of Fine Root Turnover On Forest NPP And Soil C Sequestration Potential

by Fianna O'Brien - January 30, 2017

Estimates of forest net primary production (NPP) demand accurate estimates of root production and turnover. We assessed root turnover with the use of an isotope tracer in two forest free-air… More

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Exposure To An Enriched CO2 Atmosphere Alters Carbon Assimilation And Allocation In A Pine Forest Ecosystem

by Fianna O'Brien - January 30, 2017

We linked a leaf-level CO2 assimilation model with a model that accounts for light attenuation in the canopy and measurements of sap-flux-based canopy conductance into a new canopy conductance-constrained carbon… More

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Estimating Components Of Forest Evapotranspiration: A Footprint Approach For Scaling Sap Flux Measurements

by Fianna O'Brien - January 30, 2017

Forest evapotranspiration (ET) estimates that include scaled sap flux measurements often underestimate eddy covariance (EC)-measured latent heat flux (LE). We investigated potential causes for this bias using 4 years of… More

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Reduction Of Forest Floor Respiration By Fertilization On Both Carbon Dioxide-Enriched And Reference 17-Year-Old Loblolly Pine Stands

by Fianna O'Brien - January 30, 2017

Elevated atmospheric carbon dioxide (CO2e) increases soil respiration rates in forest, grassland, agricultural and wetland systems as a result of increased growth, root biomass and enhanced biological activity of soil… More

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