Shade tree diversity and aboveground carbon stocks inTheobroma cacaoagroforestry systems: implications for REDD+ implementation in a West African cacao landscape.
BACKGROUND
The promotion of cacao agroforestry is one of the ways of diversifying farmer income and creating incentives through their inclusion in REDD+ interventions. We estimated the aboveground carbon stocks in cacao and shade trees, determined the floristic diversity of shade trees and explored the possibility of implementing REDD+ interventions in cacao landscapes. Using replicated multi-site transect approach, data were collected from nine 1-ha plots established on 5 km long transects in ten cacao growing districts in Ghana West Africa. Biomass of cacao and shade trees was determined using allometric equations.


RESULTS
One thousand four hundred and one (1401) shade trees comprising 109 species from 33 families were recorded. Total number of species ranged from 34 to 49.Newbouldia laevis(Bignoniacea) was the most frequently occurring specie and constituted 43.2 % of all shade trees. The most predominant families were Sterculiaceae and Moraceae (10 species each), followed by Meliaceae and Mimosaceae (8 species each) and Caesalpiniacaea (6 species). Shannon diversity indices (H', Hmaxand J') and species richness were low compared to other similar studies. Shade tree densities ranged from 16.2 ± 3.0 to 22.8 ± 1.7 stems ha-1and differed significantly between sites. Carbon stocks of shade trees differed between sites but were similar in cacao trees. The average C stock in cacao trees was 7.45 ± 0.41 Mg C ha-1compared with 8.32 ± 1.15 Mg C ha-1in the shade trees.


CONCLUSIONS
Cacao landscapes in Ghana have the potential of contributing to forest carbon stocks enhancement by increasing the stocking density of shade trees to recommended levels.
Faculty of Renewable Natural Resources (FRNR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana.
Evans
E
Dawoe
Faculty of Renewable Natural Resources (FRNR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana ; SNV Netherlands Development Organization, Accra, Ghana.
Winston
W
Asante
Faculty of Renewable Natural Resources (FRNR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana.
Emmanuel
E
Acheampong
Forestry Research Institute of Ghana (FORIG), Council for Scientific and Industrial Research (CSIR), Kumasi, Ghana.
Paul
P
Bosu
Carbon stocks; Diversity indices; REDD+; Shade trees; Species richness; Theobroma cacao