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Publications Found: 1437

The Robustness Of Eddy Correlation Fluxes For Amazon Rain Forest Conditions
Kruijt, B., Elbers, J. A., von Randow, C., Araújo, A. C., Oliveira, P. J., Culf, A., Manzi, A. O., Nobre, A. D., Kabat, P., Moors, E. J.

We analyzed errors and uncertainties in time-integrated eddy correlation data for sites in the Amazon. A well-known source of potential error in eddy correlation is through possible advective losses of CO₂emissions during calm nights. There are also questions related to the treatment of low frequencies, non-horizontal …

Journal: Ecological Applications, Volume 14 (sp4): 101-113 (2004). DOI: 10.1890/02-6004 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Response Of The Carbon Isotopic Content Of Ecosystem, Leaf, And Soil Respiration To Meteorological And Physiological Driving Factors In A Pinus Ponderosa Ecosystem
McDowell, N. G., Bowling, D. R., Bond, B. J., Irvine, J., Law, B. E., Anthoni, P., Ehleringer, J. R.

Understanding the controls over ecosystem-respired δ¹³C (δ¹³C_R) is important for applications of isotope-based models of the global carbon budget as well as for understanding ecosystem-level variation in isotopic discrimination (Δ). Discrimination may be strongly dependent on synoptic-scale variation …

Journal: Global Biogeochemical Cycles, Volume 18 (1): n/a-n/a (2004). DOI: 10.1029/2003gb002049 Sites: US-Me2, US-Me4

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). DOI: 10.1890/01-6019 Sites: BR-Sa3

A Model For Scalar Advection Inside Canopies And Application To Footprint Investigation
Lee, X.

In this paper, a model is presented for scalar advection inside canopies. A key result is an advection/diffusion equation that captures the persistence effect of the diffusion plume from elevated sources through a near-field modifier. The model is applicable to various source configurations including line source, plane and …

Journal: Agricultural And Forest Meteorology, Volume 127 (3-4): 131-141 (2004). DOI: 10.1016/j.agrformet.2004.07.009 Sites: US-GMF

Net Primary Production And Net Ecosystem Production Of A Boreal Black Spruce Wildfire Chronosequence
Bond-Lamberty, B., Wang, C., Gower, S. T.

Net primary production (NPP) was measured in seven black spruce (Picea mariana (Mill.) BSP)-dominated sites comprising a boreal forest chronosequence near Thompson, Man., Canada. The sites burned between 1998 and 1850, and each contained separate well- and poorly drained stands. All components of NPP were measured, most …

Journal: Global Change Biology, Volume 10 (4): 473-487 (2004). DOI: 10.1111/j.1529-8817.2003.0742.x Sites: CA-Man, CA-NS2, CA-NS3, CA-NS5, CA-NS6, CA-NS7

Ecological Research In The Large-Scale Biosphere– Atmosphere Experiment In Amazonia: Early Results
Keller, M., Alencar, A., Asner, G. P., Braswell, B., Bustamante, M., Davidson, E., Feldpausch, T., Fernandes, E., Goulden, M., Kabat, P., Kruijt, B., Luizão, F., Miller, S., Markewitz, D., Nobre, A. D., Nobre, C. A., Priante Filho, N., da Rocha, H., Silva Dias, P., von Randow, C., Vourlitis, G. L.

The Large-scale Biosphere–Atmosphere Experiment in Amazonia (LBA) is a multinational, interdisciplinary research program led by Brazil. Ecological studies in LBA focus on how tropical forest conversion, …

Journal: Ecological Applications, Volume 14 (sp4): 3-16 (2004). DOI: 10.1890/03-6003 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Forest Attributes From Radar Interferometric Structure And Its Fusion With Optical Remote Sensing
Treuhaft, R. N., Law, B. E., Asner, G. P.

The possibility of global, three-dimensional remote sensing of forest structure with interferometric synthetic aperture radar (InSAR) bears on important forest ecological processes, particularly the carbon cycle. InSAR supplements two-dimensional remote sensing with information in the vertical dimension. Its strengths in potential …

Journal: Bioscience, Volume 54 (6): 561-571 (2004). DOI: 10.1641/0006-3568(2004)054[0561:fafris]2.0.co;2 Sites: US-Me2, US-Me4, US-Me5

Biometric And Micrometeorological Measurements Of Tropical Forest Carbon Balance
Miller, S. D., Goulden, M. L., Menton, M. C., da Rocha, H. R., de Freitas, H. C., Figueira, A. M., Dias de Sousa, C. A.

We used two independent approaches, biometry and micrometeorology, to determine the net ecosystem production (NEP) of an old growth forest in Pará, Brazil. Biometric inventories indicated that the forest was either a source or, at most, a modest sink of carbon from 1984 to 2000 (+0.8 ± 2 Mg C·ha⁻¹·yr⁻¹; …

Journal: Ecological Applications, Volume 14 (sp4): 114-126 (2004). DOI: 10.1890/02-6005 Sites: BR-Sa3

Estimating Photosynthetic C-13 Discrimination In Terrestrial CO2 Exchange From Canopy To Regional Scales
Lai, C., Ehleringer, J. R., Tans, P., Wofsy, S. C., Urbanski, S. P., Hollinger, D. Y.

We determined δ¹³C values associated with canopy gross and net CO₂ fluxes from four U.S. sites sampled between 2001 and 2002. Annual mean, flux-weighted δ¹³C values of net ecosystem CO₂exchange (NEE) were estimated for four contrasting ecosystems (three forests and one grassland) by analyzing …

Journal: Global Biogeochemical Cycles, Volume 18 (1): n/a-n/a (2004). DOI: 10.1029/2003gb002148 Sites: US-Ho1

Carbon Balance And Vegetation Dynamics In An Old-Growth Amazonian Forest
Rice, A. H., Pyle, E. H., Saleska, S. R., Hutyra, L., Palace, M., Keller, M., de Camargo, P. B., Portilho, K., Marques, D. F., Wofsy, S. C.

Amazon forests could be globally significant sinks or sources for atmospheric carbon dioxide, but carbon balance of these forests remains poorly quantified. We surveyed 19.75 ha along four 1-km transects …

Journal: Ecological Applications, Volume 14 (sp4): 55-71 (2004). DOI: 10.1890/02-6006 Sites: BR-Sa1

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