C density was highest in R. stylosa forests (758.62 95.05 Mg C ha1) followed by Sonneratia apetala forests (487.82 147.57 Mg C ha1) and Bruguiera gymnorrhiza forests (463.88 144.36 Mg C ha1). C density was lowest in the K. candeleA. corniculatum þ A.marina forests (206.77 56.29 Mg C ha1) (Supplementary Fig. S1). The average C density did not differ significantly among the provinces. The total C stocks in mangrove forests in China was 6.90 0.57 Tg, and the average C density among forest types was 355.25 82.19 Mg C ha1