THE MODIFICATION OF THE CROP CHLOROPHYLL CONTENT INDICES BASED ON A NEW LAI DETERMINATION INDEX

摘要

LAI is a major factor which may influence the chlorophyll content indices. Based on a newLAI index-sLAIDI, per presents a new modification method of chlorophyll content indiceswhich is to divide the chlorophyll content indices by sLAIDI～k to reduce the influence of LAI. Basedon the data stimulated by PROSPECT-SAIL modal and measured data, six chlorophyll contentindices are chosen to verify the method. For the stimulated dataset, the normalized standarddeviations of chlorophyll content indices are used to evaluate effect of modification and todetermine the parameter k. For measured datasets, the correlation coefficients are used to evaluateresult of modification. The result shows that the new modification method can improve accuracy ofestimation of chlorophyll content indices, and can achieve the best result through adjustingparameter k.