Estimation du stock de carbone organique dans les plantations de Acacia auriculiformis A. Cunn. ex Benth. des forêts classées de Pahou et de Ouèdo au Sud du Bénin

Abstract

The reduction by trees of carbon dioxide is an important ecosystem activity. The present study aimed at assessing the organic carbon stock in the plantations of Acacia auriculiformis of the classified forests of Ouèdo and Pahou in order to better understanding their contribution to mitigating climate changes. The method described by IPCC (2007), FAO (2002) associated with allometrics equations were used for the carbon stock estimation. The climate datas used, were collected at the Meteorological Station of Agonkanmè. According to the different components of trees, results shown that the trunk has the highest rate of carbon stock: 78.17%; branches: 19.50% and leaves: 2.33%. The potential of soil carbon’s sequestration varies between 31.46% and 70.99% depending on soil types. The high-level stocks of carbon are obtained in 2.5 years old on a hydromorphic soil plantation in Pahou (106.23 ± 38.39 tC / ha) compared with 77.77 ± 5.47 tC / ha from the 2 years old plantation on a ferralitic soil in Ouèdo. There is a high negative and significant correlation (r =-0.931, P <0.001) between temperature and carbon’s stock. The high temperatures observed are the result of low carbon’s sequestration.