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CO2 Balance Of Boreal, Temperate, And Tropical Forests Derived From A Global Database

by Fianna O'Brien - January 30, 2017

Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount of the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding the fate of this carbon over… More

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Effects Of Elevated Atmospheric CO2 On Soil Microbial Biomass, Activity, And Diversity In A Chaparral Ecosystem

by Fianna O'Brien - January 30, 2017

This study reports the effects of long-term elevated atmospheric CO2 on root production and microbial activity, biomass, and diversity in a chaparral ecosystem in southern California. The free air CO2… More

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Elevated Atmospheric CO2 Lowers Herbivore Abundance, But Increases Leaf Abscission Rates

by Fianna O'Brien - January 30, 2017

Increased levels of atmospheric carbon dioxide (CO2) are likely to affect the trophic relationships that exist between plants, their herbivores and the herbivores’ natural enemies. This study takes advantage of… More

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Changes In Soil Aggregation Associated With Tallgrass Prairie Restoration

by Fianna O'Brien - January 30, 2017

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A Long-Term Record Of Carbon Exchange In A Boreal Black Spruce Forest: Means, Responses To Interannual Variability, And Decadal Trends

by Fianna O'Brien - January 30, 2017

We present a decadal (1994–2004) record of carbon dioxide flux in a 160-year-old black spruce forest/veneer bog complex in central Manitoba, Canada. The ecosystem shifted from a source (+41 g C m−2, 1995)… More

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Spatial And Temporal Variability In Forest-Atmosphere CO2 Exchange

by Fianna O'Brien - January 30, 2017

Seven years of carbon dioxide flux measurements indicate that a ∼90-year-old spruce dominated forest in Maine, USA, has been sequestering 174±46 g C m−2 yr−1 (mean±1 standard deviation, nocturnal friction velocity (u*) threshold >0.25 m s−1)…. More

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Comparing Laser-Based Open- And Closed-Path Gas Analyzers To Measure Methane Fluxes Using The Eddy Covariance Method

by Fianna O'Brien - January 30, 2017

Closed- and open-path methane gas analyzers are used in eddy covariance systems to compare three potential methane emitting ecosystems in the Sacramento-San Joaquin Delta (CA, USA): a rice field, a… More

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Carbon Dioxide Exchange Between An Old-Growth Forest And The Atmosphere

by Fianna O'Brien - January 30, 2017

Eddy-covariance and biometeorological methods show significant net annual carbon uptake in an old-growth Douglas-fir forest in southwestern Washington, USA. These results contrast with previous assumptions that old-growth forest ecosystems are… More

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The Role Of Harvest Residue In Rotation Cycle Carbon Balance In Loblolly Pine Plantations. Respiration Partitioning Approach

by Fianna O'Brien - January 30, 2017

Timber harvests remove a significant portion of ecosystem carbon. While some of the wood products moved off-site may last past the harvest cycle of the particular forest crop, the effect… More

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Modeling Radiation And Photosynthesis Of A Heterogeneous Savanna Woodland Landscape With A Hierarchy Of Model Complexities

by Fianna O'Brien - January 30, 2017

Simple but realistic modeling of radiation transfer within heterogeneous canopy has been a challenging research question for decades and is critical for predicting ecological processes such as photosynthesis. The Markov… More

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