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Comparing Net Ecosystem Exchange Of Carbon Dioxide Between An Old-Growth And Mature Forest In The Upper Midwest, Usa

by Fianna O'Brien - January 27, 2017

Old-growth forests are often assumed to exhibit no net carbon assimilation over time periods of several years. This generalization has not been typically supported by the few whole-ecosystem, stand-scale eddy-covariance… More

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Precipitation Acidity: The Role Of The Forest Canopy In Acid Exchange

by Fianna O'Brien - January 27, 2017

Individual rain events were sampled above and below the forest canopy in Walker Branch Watershed, Tennessee, from August 1977 to June 1978 for the purpose of analysis of acidity and… More

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Patterns Of Species Richness And Composition In Re-Created Grassland

by Fianna O'Brien - January 27, 2017

The success of many prairie restorations is not well documented. A restoration begun in 1975 at the Fermi National Accelerator Laboratory near Chicago, Illinois allows assessment of restoration efforts as… More

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Eco-Hydrological Controls On Summertime Convective Rainfall Triggers

by Fianna O'Brien - January 27, 2017

Triggers of summertime convective rainfall depend on numerous interactions and feedbacks, often compounded by spatial variability in soil moisture and its impacts on vegetation function, vegetation composition, terrain, and all… More

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Seasonal Variation In The Statistics Of Photosynthetically Active Radiation Penetration In An Oak-Hickory Forest

by Fianna O'Brien - January 27, 2017

The seasonal variability in the frequency distribution (FD) and higher order moments (e.g., standard deviation, skewness and kurtosis) of photosynthetically active radiation (PAR) penetration in an oak—hickory forest were examined…. More

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Extensive Observations Of Co2carbon Isotope Content In And Above A High-Elevation Subalpine Forest

by Fianna O'Brien - January 27, 2017

The dynamics of forest-atmosphere CO2 carbon isotope exchange were examined in a coniferous forest in Colorado, United States. Tunable diode laser absorption spectrometry provided extensive characterization of the carbon isotope… More

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Modeling Energy And Carbon Fluxes In A Heterogeneous Oak Woodland: A Three-Dimensional Approach

by Fianna O'Brien - January 27, 2017

Most land surface and ecosystem models assume that a vegetated canopy can be abstracted as a turbid medium when such models compute mass, energy, and carbon exchange. However, those models… More

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Changes In Forest Composition In Central Missouri: 1968-1982

by Fianna O'Brien - January 27, 2017

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Three-Dimensional Canopy Fuel Loading Predicted Using Upward And Downward Sensing LiDAR Systems

by Fianna O'Brien - January 27, 2017

We calibrated upward sensing profiling and downward sensing scanning LiDAR systems to estimates of canopy fuel loading developed from field plots and allometric equations, and then used the LiDAR datasets… More

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Environmental And Biological Controls On Water And Energy Exchange In Florida Scrub Oak And Pine Flatwoods Ecosystems

by Fianna O'Brien - January 27, 2017

Scrub oak and pine flatwoods are two contrasting ecosystems common to the humid subtropical climate of Florida. Scrub oak forests are short in stature (<2 m) and occur on well-drained… More

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