marina (A. marina, a grey mangrove species) show a succession of dark colored xylem tissue bands and pale colored phloem tissue bands (Robert et al., 2011). It is difficult to clearly distinguish RISC layers from annual rings, because the RISC layers possess similar morphological features as compared to annual rings through megascopic cross sectional observations (Fig. 1). RISC layer cannot form a complete closed ring but several fragments in a growing season (Robert et al., 2011, 2014; Nazim et al., 2013). Previous studies have demonstrated that the dendrochronological methods cannot be applied to some successive cambia species (Schmitz et al., 2007; Nazim et al., 2013). Santini et al. (2013) used radiocarbon techniques combining with X-ray densitometry to develop a wood density chronology for A. marina in the Exmouth Gulf (from Western Australia), and confirmed that the actual growth rates (range from 4.08 ± 2.36 to 5.30 ± 3.33 mm/yr) were higher than the RISC layer width (range from 0.58 ± 0.08 to 0.97 ± 0.29 mm/layer) (Santini