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Publications Found: 1437

Wide Dynamic Range Vegetation Index For Remote Quantification Of Biophysical Characteristics Of Vegetation
Gitelson, A. A.

The Normalized Difference Vegetation Index (NDVI) is widely used for monitoring, analyzing, and mapping temporal and spatial distributions of physiological and biophysical characteristics of vegetation. It is well documented that the NDVI approaches saturation asymptotically under conditions of moderate-to-high aboveground biomass. …

Journal: Journal Of Plant Physiology, Volume 161 (2): 165-173 (2004). DOI: 10.1078/0176-1617-01176 Sites: US-Ne1, US-Ne2, US-Ne3

Satellite Monitoring Of Vegetation Dynamics: Sensitivity Enhancement By The Wide Dynamic Range Vegetation Index
Viña, A., Genebry, G.M., Gitelson, A. A.

Synoptic monitoring of vegetation dynamics relies on satellite observations of the distinctive spectral contrast between red and near infrared reflectance that photosynthetically active green vegetation exhibits. It has long been recognized that the Normalized Difference Vegetation Index (NDVI) suffers a rapid decrease of sensitivity …

Journal: Geophysical Research Letters, Volume 31 (4): 1-4 (2004). DOI: 10.1029/2003gl019034 Sites: US-Ne1, US-Ne2, US-Ne3

Enhancement Of Carbon Sequestration In US Soils
Post, W. M., Izaurralde, R. C., Jastrow, J. D., McCarl, B. A., Amonette, J. E., Bailey, V. L., Jardine, P. M., West, T. O., Zhou, J.

Improved practices in agriculture, forestry, and land management could be used to increase soil carbon and thereby significantly reduce the concentration of atmospheric carbon dioxide. Understanding biological and edaphic processes that increase and retain soil carbon can lead to specific manipulations that …

Journal: Bioscience, Volume 54 (10): 895-908 (2004). DOI: 10.1641/0006-3568(2004)054[0895:eocsiu]2.0.co;2 Sites: US-IB1, US-IB2

Gap-Filling Missing Data In Eddy Covariance Measurements Using Multiple Imputation (MI) For Annual Estimations
Hui, D., Wan, S., Su, B., Katul, G., Monson, R., Luo, Y.

Missing data is a ubiquitous problem in evaluating long-term experimental measurements, such as those associated with the FluxNet project, due to the equipment failures, system maintenance, power-failure, and lightning strikes among other things. To estimate annual values …

Journal: Agricultural And Forest Meteorology, Volume 121 (1-2): 93-111 (2004). DOI: 10.1016/s0168-1923(03)00158-8 Sites: US-Dk3, US-NR1, US-WBW

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). DOI: 10.1016/j.agrformet.2003.10.004 Sites: US-Var

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). DOI: 10.1029/2003gb002182 Sites: US-Dk3

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 banksiana Lamb.) stands (0-, 5-, 10-, and∼29-year-old) and a∼79-year-old stand …

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

Seasonal Variation And Partitioning Of Ecosystem Respiration In A Southern Boreal Aspen Forest
Griffis, T., Black, T., Gaumont-Guay, D., Drewitt, G., Nesic, Z., Barr, A., Morgenstern, K., Kljun, N.

Continuous automatic chamber and eddy covariance (EC) measurements were made at an old aspen forest (SOA) located at southern boreal treeline in Saskatchewan, Canada to examine the temporal variability in soil (R_s), tree bole (R_b), and ecosystem respiration (R_E) during 2001. …

Journal: Agricultural And Forest Meteorology, Volume 125 (3-4): 207-223 (2004). DOI: 10.1016/j.agrformet.2004.04.006 Sites: CA-Oas

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). DOI: 10.1111/j.1365-2486.2004.00867.x Sites: US-Dk1, US-Dk2, US-Dk3

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

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