Floristic structure and sequestration potential of cashew agroecosystems in Africa: A case study from Cameroon

Agroecosystems are not only recognized by their high capacity of carbon storage and sequestration, they could also offer an opportunity of financial benefits in the event of payment for environmental services. The present study aimed to evaluate the carbon storage and describe the structure of cashew nut plantation. Three types of cashew stand were selected according to the age of plantations; we also used savannah as a treatment witness. Carbon stocks varied according to the age of plantations; 14.51 ± 0.306 t C/ha for plantations aged 0–10 yr; 34.78 ± 0.331 t C/ha for plantations aged 10–20 yr, and 40.02 ± 0.381 t C/ha for plantations aged over 20 yr. In the witness, we found 13.05 ± 0.177 t C/ha. These values were significantly different between the studied sites (p < 0.05). The mean values of the service of carbon sequestration also varied with the age of stands; $53.5/ha/yr (0–10 yr); $63.35/ha/yr (10–20 yr); $73.95/ha/yr (over 20 yr). In regard to carbon storage, $3279 are stored in these stands. These agroecosystems are also true carbon sinks. A development plan of such agroecosystems should be considered for the conservation of the species already endangered by anthropogenic activities on natural ecosystems.