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Publications Found: 1437

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

Variation In Wood Density Determines Spatial Patterns Inamazonian Forest Biomass
Baker, T. R., Phillips, O. L., Malhi, Y., Almeida, S., Arroyo, L., Di Fiore, A., Erwin, T., Killeen, T. J., Laurance, S. G., Laurance, W. F., Lewis, S. L., Lloyd, J., Monteagudo, A., Neill, D. A., Patino, S., Pitman, N. C., M. Silva, J. N., Vasquez Martinez, R.

Uncertainty in biomass estimates is one of the greatest limitations to models of carbon flux in tropical forests. Previous comparisons of field-based estimates of the aboveground biomass (AGB) of trees greater than 10 cm diameter within Amazonia have been limited by the paucity of data for western Amazon forests, and the use of …

Journal: Global Change Biology, Volume 10 (5): 545-562 (2004). DOI: 10.1111/j.1365-2486.2004.00751.x Sites: BR-Ma2, BR-Sa1, BR-Sa3

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

Heat Storage And Energy Balance Fluxes For A Temperate Deciduous Forest
Oliphant, A., Grimmond, C., Zutter, H., Schmid, H., Su, H., Scott, S., Offerle, B., Randolph, J., Ehman, J.

Hourly observations of forest-atmosphere energy balance components are presented for the Morgan-Monroe State Forest, south-central Indiana, USA for the period March 1998 to December 2001, with particular emphasis on the storage heat flux (ΔQ_S). The sub-components of ΔQ_S showed strong diurnal …

Journal: Agricultural And Forest Meteorology, Volume 126 (3-4): 185-201 (2004). DOI: 10.1016/j.agrformet.2004.07.003 Sites: US-MMS

Monitoring Maize (Zea Mays L.) Phenology With Remote Sensing
Viña, A., Gitelson, A. A., Rundquist, D. C., Keydan, G., Leavitt, B., Schepers, J.

Monitoring crop phenology is required for understanding intra- and interannual variations of agroecosystems, as well as for improving yield prediction models. The objective of this paper is to remotely evaluate the phenological development of maize (Zea mays L.) in terms of both biomass accumulation and reproductive organ …

Journal: Agronomy Journal, Volume 96 (4): 1139-1147 (2004). DOI: 10.2134/agronj2004.1139 Sites: US-Ne1, US-Ne2, US-Ne3

Growing Season Carbon Dioxide Exchange In Irrigated And Rainfed Maize
Suyker, A., Verma, S., Burba, G., Arkebauer, T., Walters, D., Hubbard, K.

Net ecosystem CO₂ exchange (NEE) was measured in maize-based agroecosystems in eastern Nebraska, USA, during the growing season in 2001. The objective of this study was to quantify and contrast NEE in irrigated and rainfed maize (Zea maize L.) fields. …

Journal: Agricultural And Forest Meteorology, Volume 124 (1-2): 1-13 (2004). DOI: 10.1016/j.agrformet.2004.01.011 Sites: US-Ne1, US-Ne2, US-Ne3

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). DOI: 10.1111/j.1529-8817.2003.00804.x Sites: CA-SJ1

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