AmeriFlux Publications from the Community

Ecological Setting Of The Wind River Old-Growth Forest
Shaw, D., Franklin, J., Bible, K., Klopatek, J., Freeman, E., Greene, S., Parker, G.

The Wind River old-growth forest, in the southern Cascade Range of Washington State, is a cool (average annual temperature, 8.7°C), moist (average annual precipitation, 2223 mm), 500-year-old Douglas-fir–western hemlock forest of moderate to low productivity at 371-m elevation on a less than 10% slope. There is a seasonal snowpack …

Journal: Ecosystems, Volume 7 (5): 427-439 (2004), ISBN . DOI: 10.1007/s10021-004-0135-6 Sites: US-Wrc

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

Geostatistical Integration Of Yield Monitor Data And Remote Sensing Improves Yield Maps
Dobermann, A., Ping, J. L.

Grain yield maps must accurately display general yield patterns as well as details of local yield variation. Different geostatistical procedures for creating interpolated yield maps by integrating yield data with remotely sensed vegetation indices (VI) were evaluated. Yield monitor data and a multispectral satellite image at 4-m …

Journal: Agronomy Journal, Volume 96 (1): 285-297 (2004), ISBN . DOI: 10.2134/agronj2004.0285 Sites: US-Ne1, US-Ne2

Inter-Annual Variability In The Leaf Area Index Of A Boreal Aspen-Hazelnut Forest In Relation To Net Ecosystem Production
Barr, A. G., Black, T., Hogg, E., Kljun, N., Morgenstern, K., Nesic, Z.

The seasonal phenology of the leaf area index (LAI) is a major determinant of net ecosystem production in deciduous forest ecosystems. This study describes seasonal and inter-annual differences in LAI in a boreal aspen-hazelnut forest in central Saskatchewan, Canada, between 1994 and 2003, and relates the differences in …

Journal: Agricultural And Forest Meteorology, Volume 126 (3-4): 237-255 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.06.011 Sites: CA-Oas

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

Fast Labile Carbon Turnover Obscures Sensitivity Of Heterotrophic Respiration From Soil To Temperature: A Model Analysis
Gu, L., Post, W. M., King, A. W.

Labile carbon, although often a small fraction of soil organic carbon (SOC), significantly affects heterotrophic respiration at short timescales because of its rapid decomposition. However, in the current literature, most soil respiration measurements are interpreted without simultaneous information on labile carbon pool dynamics. …

Journal: Global Biogeochemical Cycles, Volume 18 (1): n/a-n/a (2004), ISBN . DOI: 10.1029/2003gb002119 Sites: US-WBW

Net Carbon Fluxes From Forest Clearance And Regrowth In The Amazon
Steininger, M. K.

Estimates of net carbon exchange resulting from forest clearance and regrowth were made for three areas in the Brazilian and Bolivian Amazon. The study areas, ranging in size from 600 to 10 000 km², include communities that practice a range of land uses from small-scale, rotational agriculture to long-term pasture. Carbon …

Journal: Ecological Applications, Volume 14 (sp4): 313-322 (2004), ISBN . DOI: 10.1890/02-6007 Sites: BR-Sa3

Seasonality Of Water And Heat Fluxes Over A Tropical Forest In Eastern Amazonia
da Rocha, H. R., Goulden, M. L., Miller, S. D., Menton, M. C., Pinto, L. D., de Freitas, H. C., e Silva Figueira, A. M.

We used the eddy covariance technique from July 2000 to July 2001 to measure the fluxes of sensible heat, water vapor, and CO₂ between an old-growth tropical forest in eastern Amazonia and the …

Journal: Ecological Applications, Volume 14 (sp4): 22-32 (2004), ISBN . DOI: 10.1890/02-6001 Sites: BR-Sa3

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

Photosynthesis, Carboxylation And Leaf Nitrogen Responses Of 16 Species To Elevated pCO2 Across Four Free-Air CO2 Enrichment Experiments In Forest, Grassland And Desert
Ellsworth, D. S., Reich, P. B., Naumburg, E. S., Koch, G. W., Kubiske, M. E., Smith, S. D.

The magnitude of changes in carboxylation capacity in dominant plant species under long-term elevated CO₂ exposure (elevated pC_a) directly impacts …

Journal: Global Change Biology, Volume 10 (12): 2121-2138 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00867.x Sites: US-Dk1, US-Dk2, US-Dk3

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