2012 年 21 巻 1 号 p. 1-10
Above and below ground biomass was studied in six years old mangrove plantations of Avicenia marina (Am), Avicenia officinalis (Ao) and Sonneratia apetala (Sa) and a naturally regenerated stand under regeneration improving felling operation (NR: consists of Ceriops decandra, Bruguiera sexangula, and Aegicerus corniculatum) protected for seven years since 2000. Common allometric equations were developed for biomass estimation by performing regressions between dry weights of trees as dependent variables and biometric parameters such as stem diameter, height and wood density as independent variables. The above and below ground biomass in NR (70 Mg ha-1 and 104 Mg ha-1) was the greatest (P < 0.001), and followed by Sa (69 Mg ha-1 and 32 Mg ha-1), Am (25 Mg ha-1 and 27 Mg ha-1) and Ao (21 Mg ha-1 and 26 Mg ha-1). The total carbon stock in biomass was 73 Mg C ha-1 in NR, 43 Mg C ha-1 in Sa, 21 Mg C ha-1 in Am and 18 Mg C ha-1 in Ao respectively. The averaged total soil carbon stock up to 1 m soil depth in plantation site was estimated to be 167 ± 58 Mg C ha-1 which was nearly two times higher than that of current paddy fields 85 ± 17 Mg C ha-1. These facts suggest the feasibility of mangrove plantations and natural regeneration as a carbon sequestration tool. The induced natural regeneration method showed high feasibility as a low cost management to enhance the rapid restoration of the mangrove ecosystem.