Relationship between gross primary production and chlorophyll content in crops: Implications for the synoptic monitoring of vegetation productivity

American Geophysical Union (AGU) - Tập 111 Số D8 - 2006
Anatoly A. Gitelson1,2, Andrés Viña1,3, Shashi B. Verma2, Donald C. Rundquist1,2, Timothy J. Arkebauer4, Galina Keydan1, Bryan Leavitt1, Verónica Ciganda1,4, George Burba5,2, Andrew E. Suyker2
1Center for Advanced Land Management Information Technologies University of Nebraska Lincoln Nebraska USA
2School of Natural Resources, University of Nebraska, Lincoln, Nebraska, USA
3Now at Center for Systems Integration and Sustainability, Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan, USA.
4Department of Agronomy and Horticulture, University of Nebraska, Lincoln, Nebraska, USA
5Now at LI-COR Biosciences, Inc., Environmental Division, Lincoln, Nebraska, USA.

Tóm tắt

Accurate estimation of spatially distributed CO2 fluxes is of great importance for regional and global studies of carbon balance. We applied a recently developed technique for remote estimation of crop chlorophyll content to assess gross primary production (GPP). The technique is based on reflectance in two spectral channels: the near‐infrared and either the green or the red‐edge. We have found that in irrigated and rainfed crops (maize and soybean), midday GPP is closely related to total crop chlorophyll content. The technique provided accurate estimations of midday GPP in both crops under rainfed and irrigated conditions with root mean square error of GPP estimation of less than 0.3 mg CO2/m2s in maize (GPP ranged from 0 to 3.1 mg CO2/m2s) and less than 0.2 mg CO2/m2s in soybean (GPP ranged from 0 to 1.8 mg CO2/m2s). Validation using an independent data set for irrigated and rainfed maize showed robustness of the technique; RMSE of GPP prediction was less than 0.27 mg CO2/m2s.

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American Geophysical Union (AGU)

Tập 111 Số D8

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