Relationship between vegetation indices and gross primary production in dry dipterocarp forest, western Thailand

This study aims to investigate the relationship between the tower-based gross primary production (GPP) measurements and the satellite-based vegetation indices in dry dipterocarp forest). The study was carried out from September 2008 to March 2011. The results show that vegetation indices are strongly correlated to LAI and GPP. These indices also captured well the temporal variations of GPP during the measurement period. The coefficients of relationship between GPP and these indices were 0.88, 0.88, 0.85 and 0.88, for EVI, NDVI, MSAVI and SAVI, respectively. EVI has the strongest relation with GPP (y = 14.63x + 0.13, R? = 0.80) and therefore recommended as reliable proxy to derive the GPP for this forest.