Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES International Journal of Remote Sensing 5393-5399 2006 PAR00001426 ENG International Journal of Remote Sensing 0143-1161 CC:0002441823-0016 23-24 10.1080/01431160600823214 https://www.documentation.ird.fr/hor/PAR00001426 27 Horizon (IRD) This paper examines the relationship between spectral indices (the normalized difference vegetation index [NDVI] and photochemical reflectance index [PRI]) and the photosynthetic capacities based on chlorophyll fluorescence (F-v/F-m) of moss-, lichen- and cyanobactcria-dominated biological soil crusts collected from the Gurbantonggut Desert, Xinjiang, China, based on a liquid-water hydration experiment. While no photosynthetic activity was detected for dry crusts, hydrated crusts showed significantly higher F-v/F-m values than dry crusts. A significant correlation between the PRI and F-v/F-m was found in moss- and lichen-dominated crusts, and the determination coefficients were higher than those between the NDVI and F-v/F-m. 126 ; 068