AmeriFlux Publications from the Community

Disturbance And Climate Effects On Carbon Stocks And Fluxes Across Western Oregon USA
Law, B. E., Turner, D., Campbell, J., Sun, O. J., Van Tuyl, S., Ritts, W. D., Cohen, W. B.

We used a spatially nested hierarchy of field and remote-sensing observations and a process model, Biome-BGC, to produce a carbon budget for the forested region of Oregon, and to determine the relative influence of differences in climate and disturbance among the ecoregions on carbon stocks and fluxes. The simulations suggest that …

Journal: Global Change Biology, Volume 10 (9): 1429-1444 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00822.x Sites: US-Me2, US-Me4, US-Me5

Seasonal Variation In Carbon Dioxide Exchange Over A Mediterranean Annual Grassland In California
Xu, L., Baldocchi, D. D.

Understanding how environmental variables affect the processes that regulate the carbon flux over grassland is critical for large-scale modeling research, since grasslands comprise almost one-third of the earth’s natural vegetation. To address this issue, fluxes of CO₂ (F_c, flux toward the …

Journal: Agricultural And Forest Meteorology, Volume 123 (1-2): 79-96 (2004), ISBN . DOI: 10.1016/j.agrformet.2003.10.004 Sites: US-Var

Effects Of Logging On Carbon Dynamics Of A Jack Pine Forest In Saskatchewan, Canada
Howard, E. A., Gower, S. T., Foley, J. A., Kucharik, C. J.

We calculated carbon budgets for a chronosequence of harvested jack pine (Pinus banksianaLamb.) stands (0-, 5-, 10-, and∼29-year-old) and a∼79-year-old stand that originated after wildfire. We measured total ecosystem C content (TEC), above-, and belowground net primary productivity (NPP) for each stand. All values are …

Journal: Global Change Biology, Volume 10 (8): 1267-1284 (2004), ISBN . DOI: 10.1111/j.1529-8817.2003.00804.x Sites: CA-SJ1

Climatic Versus Biotic Constraints On Carbon And Water Fluxes In Seasonally Drought-Affected Ponderosa Pine Ecosystems
Schwarz, P. A., Law, B. E., Williams, M., Irvine, J., Kurpius, M., Moore, D.

We investigated the relative importance of climatic versus biotic controls on gross primary production (GPP) and water vapor fluxes in seasonally drought-affected ponderosa pine forests. The study was conducted in young (YS), mature (MS), and old stands (OS) over 4 years at the AmeriFlux Metolius sites. Model simulations showed that …

Journal: Global Biogeochemical Cycles, Volume 18 (GB4007): n/a-n/a (2004), ISBN . DOI: 10.1029/2004GB002234 Sites: US-Me2, US-Me4, US-Me5

Canopy Damage And Recovery After Selective Logging In Amazonia: Field And Satellite Studies
Asner, G. P., Keller, M., Pereira, Jr, R., Zweede, J. C., Silva, J. N.

We combined a detailed field study of canopy gap fraction with spectral mixture analyses of Landsat 7 ETM+ satellite imagery to assess landscape and regional dynamics of canopy damage following selective logging in an eastern Amazon forest. Our field studies encompassed measurements of ground damage and canopy gap fractions along …

Journal: Ecological Applications, Volume 14 (sp4): 280-298 (2004), ISBN . DOI: 10.1890/01-6019 Sites: BR-Sa3

Seasonal And Depth Variation Of Soil Moisture In A Burned Open Savanna (Campo Sujo) In Central Brazil
Quesada, C. A., Miranda, A. C., Hodnett, M. G., Santos, A. J., Miranda, H. S., Breyer, L. M.

The soil water regimes of two areas of open savanna (campo sujo) near Brasilia, Brazil, were monitored between August 1999 and November 2000. Each area was subjected to a different fire regime. Soil water …

Journal: Ecological Applications, Volume 14 (sp4): 33-41 (2004), ISBN . DOI: 10.1890/01-6017 Sites: BR-Sa1

Radon Fluxes In Tropical Forest Ecosystems Of Brazilian Amazonia: Night-Time CO2 Net Ecosystem Exchange Derived From Radon And Eddy Covariance Methods
Martens, C. S., Shay, T. J., Mendlovitz, H. P., Matross, D. M., Saleska, S. R., Wofsy, S. C., Woodward, W. S., Menton, M. C., De Moura, J. M., Crill, P. M., De Moraes, O. L., Lima, R. L.

Radon-222 (Rn-222) is used as a transport tracer of forest canopy–atmosphere CO₂ exchange in an old-growth, tropical rain forest site near km 67 of the Tapajós National Forest, Pará, Brazil. Initial results, from month-long periods at the end of the wet season (June–July) and the end of the dry season (November–December) …

Journal: Global Change Biology, Volume 10 (5): 618-629 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00764.x Sites: BR-Sa1

Nitrogen Deposition And Increased Carbon Accumulation In Ombrotrophic Peatlands In Eastern Canada
Turunen, J., Roulet, N. T., Moore, T. R., Richard, P. J.

Recent and long-term accumulation rates of carbon (C), using ²¹⁰Pb- and ¹⁴C-dating, were examined in 23 ombrotrophic peatlands in eastern Canada, where average 1990–1996 atmospheric wet nitrogen (N) deposition ranged from 0.3 to 0.8 g N m⁻² yr⁻¹. The average recent rate of C accumulation …

Journal: Global Biogeochemical Cycles, Volume 18 (3): n/a-n/a (2004), ISBN . DOI: 10.1029/2003gb002154 Sites: CA-Mer

Impact Of Elevated Atmospheric CO2 on Forest Floor Respiration In A Temperate Pine Forest
Suwa, M., Katul, G. G., Oren, R., Andrews, J., Pippen, J., Mace, A., Schlesinger, W. H.

The effects of elevated atmospheric CO₂ (CO₂^e) on soil respiration were evaluated using inverse models and static chamber measurements collected over 4.5 years in a maturing loblolly pine forest. The chamber measurements of forest floor CO₂ efflux showed that the flux enhancement increased …

Journal: Global Biogeochemical Cycles, Volume 18 (2): n/a-n/a (2004), ISBN . DOI: 10.1029/2003gb002182 Sites: US-Dk3

Remote Measurement Of Energy And Carbon Flux From Wildfires In Brazil
Riggan, P. J., Tissell, R. G., Lockwood, R. N., Brass, J. A., Pereira, J. A., Miranda, H. S., Miranda, A. C., Campos, T., Higgins, R.

Temperature, intensity, spread, and dimensions of fires burning in tropical savanna and slashed tropical forest in central Brazil were measured for the first time by remote sensing with an infrared imaging spectrometer that was designed to accommodate the high radiances of wildland fires. Furthermore, the first in situ airborne measurements …

Journal: Ecological Applications, Volume 14 (3): 855-872 (2004), ISBN . DOI: 10.1890/02-5162 Sites: BR-Sa1, BR-Sa3

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