Dawoe Evans, Asante Winston, Acheampong Emmanuel, Bosu Paul
Faculty of Renewable Natural Resources (FRNR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana.
Faculty of Renewable Natural Resources (FRNR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana ; SNV Netherlands Development Organization, Accra, Ghana.
Carbon Balance Manag. 2016 Aug 24;11(1):17. doi: 10.1186/s13021-016-0061-x. eCollection 2016 Dec.
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.
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. (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', H and 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 and 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 compared with 8.32 ± 1.15 Mg C ha in the shade trees.
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.
推广可可农林复合经营是使农民收入多样化并通过将其纳入减少毁林和森林退化所致排放量（REDD+）干预措施来创造激励机制的途径之一。我们估算了可可树和遮荫树的地上碳储量，确定了遮荫树的植物多样性，并探讨了在可可种植景观中实施REDD+干预措施的可能性。采用重复多地点样带法，从西非加纳十个可可种植区沿5公里长样带设置的九个1公顷样地收集数据。利用异速生长方程确定可可树和遮荫树的生物量。
记录到1401棵遮荫树，分属33科109种。物种总数在34至49种之间。（紫葳科）是最常见的物种，占所有遮荫树的43.2%。最主要的科是梧桐科和桑科（各有10种），其次是楝科和含羞草科（各有8种）以及苏木科（有6种）。与其他类似研究相比，香农多样性指数（H'、H和J'）和物种丰富度较低。遮荫树密度在16.2±3.0至22.8±1.7株/公顷之间，不同样地间差异显著。遮荫树的碳储量因样地而异，但可可树的碳储量相似。可可树的平均碳储量为7.45±0.41 Mg C/公顷，而遮荫树为8.32±1.15 Mg C/公顷。
加纳的可可种植景观有潜力通过将遮荫树的蓄积密度提高到推荐水平来促进森林碳储量的增加。
