AmeriFlux Publications from the Community

Annual Soil Respiration In Broadleaf Forests Of Northern Wisconsin: Influence Of Moisture And Site Biological, Chemical, And Physical Characteristics
Martin, J. G., Bolstad, P. V.

Soil temperature and moisture influence soil respiration at a range of temporal and spatial scales. Although soil temperature and moisture may be seasonally correlated, intra and inter-annual variations in soil moisture do occur. There are few direct observations …

Journal: Biogeochemistry, Volume 73 (1): 149-182 (2005), ISBN . DOI: 10.1007/s10533-004-5166-8 Sites: US-WCr

Comparing Net Ecosystem Exchange Of Carbon Dioxide Between An Old-Growth And Mature Forest In The Upper Midwest, Usa
Desai, A. R., Bolstad, P. V., Cook, B. D., Davis, K. J., Carey, E. V.

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 measurements of carbon dioxide exchange in old-growth forests. An eddy-flux tower installed in a >300-year-old …

Journal: Agricultural And Forest Meteorology, Volume 128 (1-2): 33-55 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.09.005 Sites: US-Syv, US-WCr

An Analysis Of Soil Respiration Across Northern Hemisphere Temperate Ecosystems
Hibbard, K. A., Law, B. E., Reichstein, M., Sulzman, J.

Over two-thirds of terrestrial carbon is stored belowground and a significant amount of atmospheric CO₂ is respired by roots and microbes in soils. For this analysis, soil respiration (Rs) data were assembled from 31 AmeriFlux and CarboEurope sites representing deciduous broadleaf, evergreen needleleaf, grasslands, mixed …

Journal: Biogeochemistry, Volume 73 (1): 29-70 (2005), ISBN . DOI: 10.1007/s10533-004-2946-0 Sites: US-Dk3, US-Ho1, US-Me2, US-Me4, US-Me5, US-NR1, US-Ton, US-UMB, US-WCr

Regional Carbon Dioxide Fluxes From Mixing Ratio Data
Bakwin, P. S., Davis, K. J., Yi, C., Wofsy, S. C., Munger, J. W., Haszpra, L., Barcza, Z.

We examine the atmospheric budget of CO₂ at temperate continental sites in the Northern Hemisphere. On a monthly time scale both surface exchange and atmospheric transport are important in determining the rate of change of CO₂ mixing ratio at these sites. Vertical differences between the atmospheric boundary …

Journal: Tellus Series B-Chemical and Physical Meteorology, Volume 56 (4): 301-311 (2004), ISBN . DOI: 10.3402/tellusb.v56i4.16446 Sites: CA-Man, US-Los, US-PFa, US-WCr

Component And Whole-System Respiration Fluxes In Northern Deciduous Forests
Bolstad, P. V., Davis, K. J., Martin, J., Cook, B. D., Wang, W.

We measured component and whole-system respiration fluxes in northern hardwood (Acer saccharumMarsh., Tilia americana L., Fraxinus pennsylvanica Marsh.) and aspen (Populus tremuloides Michx.) forest stands in Price County, northern Wisconsin from 1999 through 2002. Measurements of soil, leaf and …

Journal: Tree Physiology, Volume 24 (5): 493-504 (2004), ISBN . DOI: 10.1093/treephys/24.5.493 Sites: US-WCr

Observed Covariance Between Ecosystem Carbon Exchange And Atmospheric Boundary Layer Dynamics At A Site In Northern Wisconsin
Yi, C., Davis, K. J., Bakwin, P. S., Denning, A. S., Zhang, N., Desai, A., Lin, J. C., Gerbig, C.

Ecosystem CO₂ exchange and atmosphere boundary layer (ABL) mixing are correlated diurnally and seasonally as they are both driven by solar insulation. Tracer transport models predict that these covariance signals produce a meridional gradient of annual mean CO₂ concentration in the marine boundary layer that …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 109 (D8): n/a-n/a (2004), ISBN . DOI: 10.1029/2003jd004164 Sites: US-Los, US-PFa, US-WCr

A Nonparametric Method For Separating Photosynthesis And Respiration Components In CO2 Flux Measurements
Yi, C., Li, R., Bakwin, P. S., Desai, A., Ricciuto, D. M., Burns, S. P., Turnipseed, A. A., Wofsy, S. C., Munger, J. W., Wilson, K., Monson, R. K.

Future climate change is expected to affect ecosystem-atmosphere CO₂ exchange, particularly through the influence of temperature. To date, however, few studies have shown that differences in the response of net ecosystem CO₂ exchange (NEE) to temperature among ecosystems can be explained by differences in the …

Journal: Geophysical Research Letters, Volume 31 (17): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gl020490 Sites: US-Ha2, US-Los, US-NR1, US-PFa, US-WBW, US-WCr

Carbon Exchange And Venting Anomalies In An Upland Deciduous Forest In Northern Wisconsin, USA
Cook, B. D., Davis, K. J., Wang, W., Desai, A., Berger, B. W., Teclaw, R. M., Martin, J. G., Bolstad, P. V., Bakwin, P. S., Yi, C., Heilman, W.

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

Regional-Scale Measurements Of CH4 Exchange From A Tall Tower Over A Mixed Temperate/Boreal Lowland And Wetland Forest
Werner, C., Davis, K., Bakwin, P., Yi, C., Hurst, D., Lock, L.

The biosphere–atmosphere exchange of methane (CH₄) was estimated for a temperate/boreal lowland and wetland forest ecosystem in northern Wisconsin for 1997–1999 using the modified Bowen ratio (MBR) method. Gradients of CH₄ and CO₂ and CO₂ flux were measured on the 447-m WLEF-TV tower …

Journal: Global Change Biology, Volume 9 (9): 1251-1261 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00670.x Sites: US-Los, US-PFa, US-WCr

The Annual Cycles Of CO2 And H2O Exchange Over A Northern Mixed Forest As Observed From A Very Tall Tower
Davis, K. J., Bakwin, P. S., Yi, C., Berger, B. W., Zhao, C., Teclaw, R. M., Isebrands, J. G.

We present the annual patterns of net ecosystem-atmosphere exchange (NEE) of CO₂ and H2O observed from a 447 m tall tower sited within a mixed forest in northern …

Journal: Global Change Biology, Volume 9 (9): 1278-1293 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00672.x Sites: US-Los, US-PFa, US-WCr

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