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Modeling Temporal And Large-Scale Spatial Variability Of Soil Respiration From Soil Water Availability, Temperature And Vegetation Productivity Indices

by Fianna O'Brien - January 30, 2017

Field-chamber measurements of soil respiration from 17 different forest and shrubland sites in Europe and North America were summarized and analyzed with the goal to develop a model describing seasonal,… More

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Continuous Measurements Of Soil Respiration With And Without Roots In A Ponderosa Pine Plantation In The Sierra Nevada Mountains

by Fianna O'Brien - January 30, 2017

Continuous measurements of soil respiration and its components help us understand diurnal and seasonal variations in soil respiration and its mechanism. We continuously measured CO2 concentration at various depths in… More

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Influences Of Temperature History, Water Stress, And Needle Age On Methylbutenol Emissions

by Fianna O'Brien - January 30, 2017

Volatile organic compounds emitted by plants have long been recognized as having important influences on tropospheric chemistry, most notably in contributing to the production of tropospheric ozone and aerosols. One… More

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Associations Between Carbon Isotope Ratios Of Ecosystem Respiration, Water Availability And Canopy Conductance

by Fianna O'Brien - January 30, 2017

We tested the hypothesis that the stable carbon isotope signature of ecosystem respiration (δ13CR) was regulated by canopy conductance (Gc) using weekly Keeling plots (n=51) from a semiarid old-growth ponderosa… More

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Seasonal Variability Of Monoterpene Emission Factors For A Ponderosa Pine Plantation In California

by Fianna O'Brien - January 30, 2017

Monoterpene fluxes have been measured over an 11 month period from June 2003 to April 2004. During all seasons ambient air temperature was the environmental factor most closely related to… More

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Seasonal Measurements Of Acetone And Methanol: Abundances And Implications For Atmospheric Budgets

by Fianna O'Brien - January 30, 2017

Acetone and methanol have been measured hourly at a rural mountain site in California for a full year, providing a unique data set for analyzing the factors controlling their seasonal… More

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Response Of Stomatal Conductance To Drought In Ponderosa Pine: Implications For Carbon And Ozone Uptake

by Fianna O'Brien - January 30, 2017

To gain insight into the limitations imposed by a typical Mediterranean-climate summer drought on the uptake of carbon and ozone in the ponderosa pine (Pinus ponderosa Dougl. ex Laws.) ecosystem,… More

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Atmospheric Methyl Tertiary Butyl Ether (MTBE) At A Rural Mountain Site In California

by Fianna O'Brien - January 30, 2017

Methyl tertiary butyl ether (MTBE) was measured in air samples collected at hourly intervals near Blodgett Forest Research Station on the western slope of the Sierra Nevada, California, in July… More

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Canopy Fluxes Of 2-Methyl-3-Buten-2-Ol Over A Ponderosa Pine Forest By Relaxed Eddy Accumulation: Field Data And Model Comparison

by Fianna O'Brien - January 30, 2017

Canopy level flux measurements of 2-methyl-3-buten-2-ol (MBO) were made over a 7 year old ponderosa pine plantation in the Sierra Nevada range of California using the relaxed eddy accumulation method…. More

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A Comparison Of Three Approaches To Modeling Leaf Gas Exchange In Annually Drought-Stressed Ponderosa Pine Forests

by Fianna O'Brien - January 30, 2017

We tested, compared and modified three models of stomatal conductance at the leaf level in a forest ecosystem where drought stress is a major factor controlling forest productivity. The models… More

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