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Leaf and stand-level carbon uptake of a Mediterranean forest estimated using the satellite-derived reflectance indices EVI and PRI

Por: Garbulsky, M. F.
Colaborador(es): Peñuelas, J | Ogaya, R | Filella, I.
ISSN: 0143-1161.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): CARBON UPTAKE | ECOSYSTEM LEVELS | ENHANCED VEGETATION INDEX | GLOBAL ENVIRONMENTAL CHANGE | GROWING SEASON | LEAF LEVEL | MEDITERRANEAN FOREST | MODERATE RESOLUTION IMAGING SPECTRORADIOMETER SENSORS | NET PHOTOSYNTHETIC RATE | NORMALIZED DIFFERENCE VEGETATION INDEX | PHOTOCHEMICAL REFLECTANCE INDEX | PHOTOSYNTHETIC CAPACITY | PRIMARY CARBON | QUERCUS ILEX | RADIATION USE EFFICIENCY | REFLECTANCE INDEX | SATELLITE DATA | SPECTRAL INDICES | VEGETATION TYPE | ECOSYSTEMS | OPTICAL WAVEGUIDES | PHOTOSYNTHESIS | RADIOMETERS | REMOTE SENSING | SATELLITE IMAGERY | FORESTRY | ACCURACY ASSESSMENT | CARBON FLUX | ENVIRONMENTAL MONITORING | EVERGREEN FOREST | LEAF AREA INDEX | LIGHT USE EFFICIENCY | MEDITERRANEAN ENVIRONMENT | NDVI | PHOTOCHEMISTRY | SPECTRAL REFLECTANCE | VEGETATION INDEX | BIOMASS | CARBON | ECOSYSTEMS | FORESTS | PLANTS | RADIOMETRY | RADIATION USE EFFICIENCY | SPECTRAL INDICES | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: International Journal of Remote Sensing Vol. 34, no. 4 (2013) 1282-12966Resumen: Various aspects of global environmental change affect plant photosynthesis, the primary carbon input in ecosystems. Thus, accurate methods of measuring plant photosynthesis are important. Remotely sensed spectral indices can monitor in detail the green biomass of ecosystems, which provides a measure of potential photosynthetic capacity. In evergreen vegetation types, however, such as Mediterranean forests, the amount of green biomass changes little during the growing season and, therefore, changes in green biomass are not responsible for changes in photosynthetic rates in those forests. This study examined the net photosynthetic rates and the diametric increment of stems in a Mediterranean forest dominated by Quercus ilex using three spectral indices [normalized difference vegetation index [NDVI], enhanced vegetation index [EVI], and photochemical reflectance index [PRI]] derived from Moderate Resolution Imaging Spectroradiometer [MODIS] sensors. Average annual EVI accounted for 83 percent of the variability of the diametric increment of Q. ilex stems over a 10 year period. NDVI was marginally correlated with the diametric increment of stems. This study was the first to identify a significant correlation between net photosynthetic rates and radiation use efficiency at the leaf level using PRI derived from satellite data analysed at the ecosystem level. These results suggest that each spectral index provided different and complementary information about ecosystem carbon uptake in a Mediterranean Q. ilex forest.
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Various aspects of global environmental change affect plant photosynthesis, the primary carbon input in ecosystems. Thus, accurate methods of measuring plant photosynthesis are important. Remotely sensed spectral indices can monitor in detail the green biomass of ecosystems, which provides a measure of potential photosynthetic capacity. In evergreen vegetation types, however, such as Mediterranean forests, the amount of green biomass changes little during the growing season and, therefore, changes in green biomass are not responsible for changes in photosynthetic rates in those forests. This study examined the net photosynthetic rates and the diametric increment of stems in a Mediterranean forest dominated by Quercus ilex using three spectral indices [normalized difference vegetation index [NDVI], enhanced vegetation index [EVI], and photochemical reflectance index [PRI]] derived from Moderate Resolution Imaging Spectroradiometer [MODIS] sensors. Average annual EVI accounted for 83 percent of the variability of the diametric increment of Q. ilex stems over a 10 year period. NDVI was marginally correlated with the diametric increment of stems. This study was the first to identify a significant correlation between net photosynthetic rates and radiation use efficiency at the leaf level using PRI derived from satellite data analysed at the ecosystem level. These results suggest that each spectral index provided different and complementary information about ecosystem carbon uptake in a Mediterranean Q. ilex forest.

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