Photochemical reflectance index (PRI) for detecting responses of diurnal and seasonal photosynthetic activity to experimental drought and warming in a Mediterranean shrubland
Zhang, Chao (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Liu, Daijun (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ogaya Inurrigarro, Romà (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Llusià Benet, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Asensio, Dolores (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Fecha:	2017
Resumen:	Climatic warming and drying are having profound impacts on terrestrial carbon cycling by altering plant physiological traits and photosynthetic processes, particularly for species in the semi-arid Mediterranean ecosystems. More effective methods of remote sensing are needed to accurately assess the physiological responses and seasonal photosynthetic activities of evergreen species to climate change. We evaluated the stand reflectance in parallel to the diurnal and seasonal changes in gas exchange, fluorescence and water contents of leaves and soil for a Mediterranean evergreen shrub, Erica multiflora, submitted to long-term experimental warming and drought. We also calculated a differential photochemical reflectance index (DPRI, morning PRI subtracted from midday PRI) to assess the diurnal responses of photosynthesis (DA) to warming and drought. The results indicated that the PRI, but not the normalized difference vegetation index (NDVI), was able to assess the seasonal changes of photosynthesis. Changes in water index (WI) were consistent with seasonal foliar water content (WC). In the warming treatment, DA value was higher than control in winter but DYield was significantly lower in both summer and autumn, demonstrating the positive effect of the warming on the photosynthesis in winter and the negative effect in summer and autumn, i. e. , increased photosynthetic midday depression in summer and autumn, when temperatures were much higher than in winter. Drought treatment increased the midday depression of photosynthesis in summer. Importantly, DPRI was significantly correlated with DA both under warming and drought, indicating the applicability of DPRI for tracking the midday depression of photosynthetic processes. Using PRI and DPRI to monitor the variability in photosynthesis could provide a simple method to remotely sense photosynthetic seasonality and midday depression in response to ongoing and future environmental stresses.
Ayudas:	European Commission 610028 Ministerio de Economía y Competitividad CGL2016-79835-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Drought ; Evergreen ; Midday depression ; Photochemical reflectance index (PRI) ; Photosynthesis ; Remote sensing ; Warming ; Water index (WI)
Publicado en:	Remote sensing (Basel), Vol. 9, Issue 11 (November 2017) , art. 1189, ISSN 2072-4292

DOI: 10.3390/rs9111189

21 p, 1.8 MB

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