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Classification Of Crop Yield Variability In Irrigated Production Fields

by Fianna O'Brien - January 31, 2017

Crop yield maps reflect stable yield patterns and annual random yield variation. Procedures for classifying a sequence of yield maps to delineate yield zones were evaluated in two irrigated maize… More

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Eddy-Correlation Measurements Of Carbon Dioxide Efflux From The Floor Of A Deciduous Forest

by Fianna O'Brien - January 31, 2017

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Test Of An Extended Mathematical Approach To Calculate Maize Leaf Area Index And Leaf Angle Distribution

by Fianna O'Brien - January 31, 2017

Accurate estimates of leaf area index (LAI) and leaf angle distribution (LAD) are important for estimating the exchange of energy and gases in vegetative canopies. Direct estimates of LAI and… More

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Carbon Dioxide Exchange And Nocturnal Processes Over A Mixed Deciduous Forest

by Fianna O'Brien - January 31, 2017

This paper reports the results of the analysis of CO2 exchange from a one-month experiment conducted at a mixed deciduous forest, Camp Borden (80°65′W, 44°19′ N), Canada, in the summer… More

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A Multi-Site Analysis Of Random Error In Tower-Based Measurements Of Carbon And Energy Fluxes

by Fianna O'Brien - January 31, 2017

Measured surface-atmosphere fluxes of energy (sensible heat, H, and latent heat, LE) and CO2 (FCO2) represent the “true” flux plus or minus potential random and systematic measurement errors. Here, we… More

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Modeling Light Use Efficiency In A Subtropical Mangrove Forest Equipped With Co2 Eddy Covariance

by Fianna O'Brien - January 31, 2017

Despite the importance of mangrove ecosystems in the global carbon budget, the relationships between environmental drivers and carbon dynamics in these forests remain poorly understood. This limited understanding is partly… More

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Screening Yield Monitor Data Improves Grain Yield Maps

by Fianna O'Brien - January 31, 2017

Yield monitor data contain systematic and random errors, which must be removed for creating accurate yield maps. A general procedure for assessing yield data cleaning methods was applied to a… More

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Uncertainty Estimates For 1-H Averaged Turbulence Fluxes Of Carbon Dioxide, Latent Heat And Sensible Heat

by Fianna O'Brien - January 31, 2017

A new observational approach is presented to approximate the uncertainty (scatter or error variance) in 1-h averaged turbulence fluxes from eddy-covariance measurements. The uncertainty includes potential contributions from instrument problems,… More

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Sap Flow In Trembling Aspen: Implications For Stomatal Responses To Vapor Pressure Deficit

by Fianna O'Brien - January 31, 2017

We monitored sap flow and estimated diurnal changes in transpiration rates of two trembling aspen (Populus tremuloides Michx.) stands, located in the southern boreal forest and aspen parkland of Saskatchewan,… More

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Direct Measurement Of Biosphere-Atmosphere Isotopic Co2exchange Using The Eddy Covariance Technique

by Fianna O'Brien - January 31, 2017

Quantifying isotopic CO2 exchange between the biosphere and atmosphere presents a significant measurement challenge, but has the potential to provide important constraints on local, regional, and global carbon cycling. Past… More

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