Fig. 6
From: Late Holocene fire history and charcoal decay in subtropical dry forests of Puerto Rico
Time-series of 13C discrimination (∆13C) in the (a) northeastern and (b) 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. The black dotted lines represent average ∆13C values of (a) wood litter fall in the northeastern subtropical dry forest during the 2015 drought year, and (b) branches collected in Dec 2015 in the southeastern subtropical dry forest. The gray dotted lines represent average values ± SD of ∆13C of branches collected in Dec 2015 in the southeastern subtropical dry forest. Diamonds (♦) represent the time series of ∆13C. δ13C values were analyzed at Michigan Technological University in Aug and Dec 2016, and May 2017