Photochemical Reflectance Index (PRI) for Detecting Responses of Diurnal and Seasonal Photosynthetic Activity to Experimental Drought and Warming in a Mediterranean Shrubland. - Chao Zhang 006; Iolanda Filella; Daijun Liu; Romà Ogaya; Joan Llusià; Dolores Asensio; Josep Peñuelas (Remote. Sens., 2017)