Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 31, 1999
Publication Date: November 15, 1999
Citation: Pinter Jr, P.J., Barnes, E.M., Kimball, B.A., Wall, G.W., Brooks, T.J. 1999. Modeling carbon accumulation in wheat using multi-temporal ndvi observations. Agronomy Abstracts. pp 16. Technical Abstract: Identifying sources and sinks for carbon in terrestrial ecosystems is an important priority for the scientific community. Approaches that use satellite-derived indices to approximate net primary productivity (NPP) are nearing operational status. Validating these methods for complex ecosystems on regional scales remains a formidable task. However, agricultural monocultures offer simpler systems for examining the performance of these methods. During the Free Air Carbon dioxide Enrichment (FACE) wheat project, we measured the normalized difference vegetation index (NDVI) using ground-based radiometers, estimated absorbed PAR from NDVI, and evaluated radiation use efficiency using growth analysis and gas exchange chambers. These parameters were used to predict seasonal NPP of wheat exposed to different water, nitrogen, and CO2 levels. We also modified CERES-Wheat to accept these parameters as inputs, improving predictions under limiting conditions.