Data from: How tree species identity and diversity affect light transmittance to the understory in mature temperate forests

light availability datafileThe research was conducted across 53 plots (30 m x 30 m) located in mature forests in the region of Ghent, Belgium (the ‘TREEWEB’ platform) Light transmittance was measured with hemispherical images before and after leaf expansion at four locations in each of the 53 plots. We calculated the gap light index (GLI), which is the total transmitted PAR to the forest floor as a percentage of total incident PAR above the canopy.light_availability_driad.csv