Fig. 5
From: Late Holocene fire history and charcoal decay in subtropical dry forests of Puerto Rico
Accumulated curves of the (a and c) observed and (b and d) corrected number of fire events based on dated 14C charcoal fragments before and after correction for charcoal decay, respectively, in the (a and b) northeastern and (c and d) southeastern subtropical dry forest of Puerto Rico, USA. Charcoal was sampled in December 2015 in the northeastern subtropical dry forest, and in December 2014 in the southeastern subtropical dry forest. Dots (•) indicate the mean number of fire events for the corresponding number of charcoal particles; horizontal bars indicate the 95% variation range of fire events for the corresponding number of charcoal particles; and lines indicate accumulated curves. The diversity function of EstimateS 9 was used to calculate the observed or estimated fire events in dated or estimated charcoal particles. The F(max) index and the constant k were calculated using the equation of exponential regression in Sigmaplot 14.0