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Leaf And Canopy Responses To Elevated CO2 In A Pine Forest Under Free-Air CO2 Enrichment

by Fianna O'Brien - January 30, 2017

Physiological responses to elevated CO2 at the leaf and canopy-level were studied in an intact pine (Pinus taeda) forest ecosystem exposed to elevated CO2 using a free-air CO2 enrichment (FACE)… More

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Biometric And Eddy-Covariance Based Estimates Of Carbon Fluxes In An Age-Sequence Of Temperate Pine Forests

by Fianna O'Brien - January 30, 2017

We present four years (2005–2008) of biometric (B) and eddy-covariance (EC) measurements of carbon (C) fluxes to constrain estimates of gross primary production (GPP), net primary production (NPP), ecosystem respiration… More

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Measuring And Modelling Seasonal Variation Of Carbon Dioxide And Water Vapour Exchange Of A Pinus Ponderosa Forest Subject To Soil Water Deficit

by Fianna O'Brien - January 30, 2017

We conducted ecosystem carbon and water vapour exchange studies in an old-growth Pinus ponderosaforest in the Pacific North-west region of the United States. The canopy is heterogeneous, with tall multiaged… More

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CO2 Fluxes Of A Boreal Black Spruce Chronosequence In Eastern North America

by Fianna O'Brien - January 30, 2017

Forest harvest and subsequent stand development can have major effects on the carbon cycle of boreal stands. Carbon dioxide (CO2) fluxes of a three-point black spruce harvest chronosequence located in… More

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An Eddy Covariance Mesonet To Measure The Effect Of Forest Age On Land-Atmosphere Exchange

by Fianna O'Brien - January 30, 2017

We deployed a mesonet of year-round eddy covariance towers in boreal forest stands that last burned in ∼1850, ∼1930, 1964, 1981, 1989, 1998, and 2003 to understand how CO2 exchange… More

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Net Primary Production And Net Ecosystem Production Of A Boreal Black Spruce Wildfire Chronosequence

by Fianna O'Brien - January 30, 2017

Net primary production (NPP) was measured in seven black spruce (Picea mariana (Mill.) BSP)-dominated sites comprising a boreal forest chronosequence near Thompson, Man., Canada. The sites burned between 1998 and… More

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Physiological Models For Scaling Plot Measurements Of CO2 Flux Across An Arctic Tundra Landscape

by Fianna O'Brien - January 30, 2017

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Atmospheric Sulfur Deposition, Neutralization, And Ion Leaching In Two Deciduous Forest Ecosystems

by Fianna O'Brien - January 30, 2017

In the 1981 water year, bulk precipitation was primarily a solution of dilute H2SO4, and SO42-was the dominant anion in tbroughfall and soil leachates in two eastern Tennessee deciduous forests…. 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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Climatic And Phenological Controls On Coherent Regional Interannual Variability Of Carbon Dioxide Flux In A Heterogeneous Landscape

by Fianna O'Brien - January 30, 2017

The climate sensitivity of plant seasonal life cycles, or phenology, may impart significant carbon cycle feedbacks on climatic change. Analysis of interannual ecosystem carbon exchange provides one way to assess… More

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