Relation of Chlorophyll Fluorescence Sensitive Reflectance Ratios to Carbon Flux Measurements of Montanne Grassland and Norway Spruce Forest Ecosystems in the Temperate Zone
Figure 4
Daily courses of calculated net ecosystem exchange of CO2 (NEE a) and light use efficiency (LUE b) in grassland ecosystem and corresponding daily course of R686/R630 (c) and Physiological Reflectance Index (PRI, (R532 − R570)/(R532 + R570)) (d) vegetation indexes (VIs) over experimental plot of 4 m2 measured via hyperspectral imaging sensor (AISA Eagle, Finland). Each data dot of eddy-covariance parameters represents an average of a half-hour measurement, and only corresponding with AISA scans are shown. VIs data dots represent an average of more than 400 000 image pixels (i.e., an average of one image scan acquired in half and one hour intervals and error bars show ± s.d.). Dashed line shows zero value of the -axis.
