Ecosystem ozone uptake can occur through stomatal and surface deposition and through gas phase chemical reactions. In a California pine forest, thinning dramatically enhanced both monoterpene emission and ozone uptake. These simultaneous enhancements provide strong evidence that ozone reactions with unmeasured biogenically emitted …
Journal: Geophysical Research Letters, Volume 31 (22): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gl021259 Sites: US-Blo
Understanding how tropical forest carbon balance will respond to global change requires knowledge of individual heterotrophic and autotrophic respiratory sources, together with factors that control respiratory …
Journal: Ecological Applications, Volume 14 (sp4): 72-88 (2004), ISBN . DOI: 10.1890/01-6012 Sites: BR-Ma2, BR-Sa1, BR-Sa3
A new maize (Zea mays L.) simulation model, Hybrid-Maize, was developed by combining the strengths of two modeling approaches: the growth and development functions in maize-specific models represented by CERES-Maize, and the mechanistic formulation of photosynthesis and respiration in generic crop models such as INTERCOM …
Journal: Field Crops Research, Volume 87 (2-3): 131-154 (2004), ISBN . DOI: 10.1016/j.fcr.2003.10.003 Sites: US-Ne1, US-Ne2, US-Ne3
Net ecosystem CO2 exchange (NEE) was measured in maize-based agroecosystems in eastern Nebraska, USA, during the growing season in 2001. The objective of this study was to quantify and contrast NEE in irrigated and rainfed maize (Zea maize L.) fields. …
Journal: Agricultural And Forest Meteorology, Volume 124 (1-2): 1-13 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.01.011 Sites: US-Ne1, US-Ne2, US-Ne3
Missing data is a ubiquitous problem in evaluating long-term experimental measurements, such as those associated with the FluxNet project, due to the equipment failures, system maintenance, power-failure, and lightning strikes among other things. To estimate annual values …
Journal: Agricultural And Forest Meteorology, Volume 121 (1-2): 93-111 (2004), ISBN . DOI: 10.1016/s0168-1923(03)00158-8 Sites: US-Dk3, US-NR1, US-WBW
Turbulent fluxes of carbon, water vapor, and temperature were continuously measured above an upland forest in north central Wisconsin during 1999 and 2000 using the eddy covariance method. Maple (Acer saccharum), basswood (Tilia americana), and green ash (Fraxinus pennsylvanica) species found in this forest …
Journal: Agricultural And Forest Meteorology, Volume 126 (3-4): 271-295 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.06.008 Sites: US-Los, US-PFa, US-WCr
Models used to estimate net ecosystem productivity (NEP) during climate change should first be shown to simulate the effects on NEP of interannual variability in current climates. Energy and CO2 fluxes simulated by the ecosystem model ecosys were compared …
Journal: Agricultural And Forest Meteorology, Volume 126 (1-2): 99-116 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.06.005 Sites: CA-Let
To determine factors controlling the carbon dynamics of an intensively managed landscape, we measured net CO2 exchange with the atmosphere using eddy covariance and soil CO2 fluxes using static chambers along a chronosequence of slash pine (Pinus elliottii var.
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Ecological Applications, Volume 14 (4): 1154-1171 (2004), ISBN . DOI: 10.1890/02-5391
Sites: US-SP1, US-SP2, US-SP3, US-SP4
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 new postprocessing algorithm in which six common types of erroneous yield monitor values were removed: (1) combine header status up; (2) start-/end-pass …
Journal: Agronomy Journal, Volume 96 (4): 1091-1102 (2004), ISBN . DOI: 10.2134/agronj2004.1091 Sites: US-Ne1, US-Ne2, US-Ne3
The location of the Niwot Ridge Ameriflux site within the rocky mountains subjects it to airflows which are common in mountainous terrain. In this study, we examine the effects of some of these mesoscale features on local turbulent flux measurements; most notably, the formation of valley/mountain flows and mountain lee-side …
Journal: Agricultural And Forest Meteorology, Volume 125 (3-4): 187-205 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.04.007 Sites: US-NR1