Sun-induced chlorophyll fluorescence from high-resolution imaging spectroscopy data to quantify spatio-temporal patterns of photosynthetic function in crop canopies

摘要: Passive detection of sun-induced chlorophyll fluorescence (SIF) using spectroscopy has been proposed as a proxy to quantify changes in photochemical efficiency at canopy level under natural light conditions. In this study, we explored the use imaging spatio-temporal dynamics SIF within crop canopies and its sensitivity track patterns photosynthetic activity originating from interaction between vegetation structure incoming radiation well variations plant function. was retrieved Fraunhofer Line Depth (FLD) principle data acquired different time scales few metres above several growing illumination. We report first maps high spatial resolution. Changes were monitored ranging quick induced stress conditions seasonal dynamics. Natural primarily determined by varying levels distribution active (PAR). However, relationship changed throughout day demonstrating an additional physiological component modulating emission. successfully used detailed canopy's field conditions, providing new tool evaluate complex photosynthesis canopy.