evaluation de stock de carbone du sol de mangrove : cas de baie d’ambaro et de mahajamba

Abstract

Mangrove forest plays a very important role in the fight against climate change through the
carbon storage in whatever biomass and especially on the sediment. This reason led us to
assess the soil carbon stock in the mangrove of Ambaro bay and Mahajamba bay in AprilNovember 2012.The present study is still the second research study soil carbon stock of
mangrove in Madagascar. The methodological approach is especially soil studies. The direct
observations of field are followed by soil sampling to analyze the Radio Isotope Laboratory.
For sampling, five depth levels are fixed (0-15 cm, 15-30 cm, 30-50 cm, 50-100 cm and 100-
150 cm), and four strata types of mangroves are considered (open canopy,closed canopy ,
degraded and tan). The study shows that the difference between the depth levels and strata
considered in the two study sites are significant. The stock of carbon varies depending on the
depth and also the following strata studied. Than the depth is deep, the higher the carbon
increases. The study results at both sites shows that the average stock of soil carbon
Mangrove Ambaro bay is very high (454.20 ± 20.89 Mg / ha) compared to the stock of soil
carbon Mahajamba bay (193, 60 ± 13.98 Mg / ha). An unexpected result occurred when
decent terrain in Ambaro Bay which is the discovery of the new species Xylocarpus
moluccensis.
Keywords: Carbon, Soil, Mangroves, Ambaro, Mahajamba, Climate Change, REDD