Method for separating leaf scale physiological component from sunlight-induced chlorophyll fluorescence

The invention discloses a method for separating leaf scale physiological components from sunlight induced chlorophyll fluorescence, which comprises an expression of satellite observed canopy scale SIF, and the method comprises the following steps: collecting SIF, PAR and surface reflectance data; directly separating out phi f representing the physiological component by converting the form of a canopy scale SIF expression; calculating the NIRv of each pixel by using the surface reflectance data; the method comprises the following steps: taking a canopy scale SIF, photosynthetically active radiation PAR and NIRv observed by a satellite as input, and separating a physiological component phi f from the SIF; according to the method, separation of leaf scale fluorescence yield (phi f) is realized for the first time on the basis of estimation of canopy escape rate (fesc). The mathematical form is simple, the physical mechanism is clear, the required data is easy to obtain, and the method can be used in regions and a