Recent CO2 flux measurements from towers and aircraft (net ecosystem exchange by eddy covariance) and remote sensing/modeling (net primary productivity—NPP) following fire show that the regenerating boreal forest in western Canada has a low initial flux that …
Journal: Agricultural And Forest Meteorology, Volume 115 (1-2): 91-107 (2003), ISBN . DOI: 10.1016/s0168-1923(02)00170-3 Sites: CA-SF2, CA-SF3
Journal: Tree Physiology, Volume 23 (16): 1125-1136 (2003), ISBN . DOI: 10.1093/treephys/23.16.1125 Sites: US-WBW
Fluxes and concentrations of carbon dioxide and 13CO2 provide information about ecosystem physiological processes and their response to environmental …
Journal: Plant, Cell And Environment, Volume 26 (2): 231-244 (2003), ISBN . DOI: 10.1046/j.1365-3040.2003.00953.x Sites: US-WBW
This paper describes a new method to monitor continuously soil CO2 profiles using small solid-state CO2 sensors buried at different depths of the soil. Based on the measurement of soil CO2 profile and a gaseous diffusivity model, we estimated …
Journal: Agricultural And Forest Meteorology, Volume 118 (3-4): 207-220 (2003), ISBN . DOI: 10.1016/s0168-1923(03)00112-6 Sites: US-Ton
Forest development following stand-replacing disturbance influences a variety of ecosystem processes including carbon exchange with the atmosphere. On a series of ponderosa pine (Pinius ponderosa var. Laws.) stands ranging from 9 to> 300 years in central Oregon, USA, we used biological measurements to estimate carbon …
Journal: Global Change Biology, Volume 9 (4): 510-524 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00624.x Sites: US-Me4, US-Me5
We have studied the effects of local topography and canopy structure on turbulent flux measurements at a site located in mountainous terrain within a subalpine, coniferous forest. Our primary aim was to determine whether the complex terrain of the site affects the accuracy of eddy flux measurements from a practical perspective. We …
Journal: Agricultural And Forest Meteorology, Volume 119 (1-2): 1-21 (2003), ISBN . DOI: 10.1016/s0168-1923(03)00136-9 Sites: US-NR1
Elevated atmospheric carbon dioxide (CO2e) increases soil respiration rates in forest, grassland, agricultural and wetland systems as a result of increased …
Journal: Global Change Biology, Volume 9 (6): 849-861 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00630.x Sites: US-Dk3
Annual yield maps are spatially fragmented because of random variation caused by crop management as well as measurement errors. Two approaches for creating maps of spatially contiguous yield classes were evaluated at two irrigated sites. In the first approach, prior-classification interpolation (PCI), grid size was increased from …
Journal: Agronomy Journal, Volume 95 (5): 1121-1131 (2003), ISBN . DOI: 10.2134/agronj2003.1121 Sites: US-Ne1, US-Ne2, US-Ne3
We report results from the first 3 years (1999–2001) of long-term measurements of net ecosystem exchange (NEE) at an AmeriFlux site over a mixed hardwood forest in northern lower Michigan. The primary measurement methodology uses eddy covariance systems with closed-path infrared gas analyzers at two heights (46 and 34 m) above …
Journal: Journal Of Geophysical Research, Volume 108 (D14): 4417-n/a (2003), ISBN . DOI: 10.1029/2002JD003011 Sites: US-UMB
We linked a leaf-level CO2 assimilation model with a model that accounts for light attenuation in the canopy and measurements of sap-flux-based canopy conductance into a new canopy conductance-constrained carbon assimilation (4C-A) model. We estimated canopy CO2 uptake (AnC) at the Duke Forest …
Journal: Global Change Biology, Volume 9 (10): 1378-1400 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00662.x Sites: US-Dk3