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|Title:||Assessment of MODIS imagery to track light-use efficiency in a water limited Mediterranean pine forest|
|Authors:||MORENO Alvaro; MASELLI Fabio; GILABERT Maria Amparo; CHIESI M.; MARTINEZ Beatriz; SEUFERT Guenther|
|Citation:||REMOTE SENSING OF ENVIRONMENT vol. 123 p. 359-367|
|Publisher:||ELSEVIER SCIENCE INC|
|Type:||Articles in Journals|
|Abstract:||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.|
|JRC Institute:||Institute for Environment and Sustainability|
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