Gross primary production (GPP) measurements obtained from an eddy-covariance flux 14 tower have been used to analyze the information content of MODIS Photochemical Reflectance Index (PRI) data on light-use efficiency (LUE) temporal variations. The study has been conducted in a Mediterranean Pinus pinaster forest showing summer water stress. Advanced processing techniques have been used to analyze the effect of
18 various external factors on LUE and PRI variations. Most intra-annual correlation between the two variables has been found to be attributable to concurrent variations in illumination and viewing conditions. A PRI normalized from angular effects is then introduced (NPRI), which is able to track ecosystem LUE response to prolonged summer water limitations. Some possible eco-physiological reasons are provided for this phenomenon, whose potential for real-time GPP estimation is, however, limited by an observed shift between LUE and NPRI signals.
MORENO Alvaro;
MASELLI Fabio;
GILABERT Maria Amparo;
CHIESI M.;
MARTINEZ Beatriz;
SEUFERT Guenther;
2012-06-11
ELSEVIER SCIENCE INC
JRC70017
0034-4257,
http://www.sciencedirect.com/science/article/pii/S0034425712001642,
https://publications.jrc.ec.europa.eu/repository/handle/JRC70017,
10.1016/j.rse.2012.04.003,
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