University of Göttingen, Tropical Plant Production and Agricultural Systems Modelling (TROPAGS), Göttingen, Germany.
International Institute of Tropical Agriculture (IITA), Kampala, Uganda.
PLoS One. 2018 Apr 16;13(4):e0195777. doi: 10.1371/journal.pone.0195777. eCollection 2018.
Reduced climatic suitability due to climate change in cocoa growing regions of Ghana is expected in the coming decades. This threatens farmers' livelihood and the cocoa sector. Climate change adaptation requires an improved understanding of existing cocoa production systems and farmers' coping strategies. This study characterized current cocoa production, income diversification and shade tree management along a climate gradient within the cocoa belt of Ghana. The objectives were to 1) compare existing production and income diversification between dry, mid and wet climatic regions, and 2) identify shade trees in cocoa agroforestry systems and their distribution along the climatic gradient. Our results showed that current mean cocoa yield level of 288kg ha-1yr-1 in the dry region was significantly lower than in the mid and wet regions with mean yields of 712 and 849 kg ha-1 yr-1, respectively. In the dry region, farmers diversified their income sources with non-cocoa crops and off-farm activities while farmers at the mid and wet regions mainly depended on cocoa (over 80% of annual income). Two shade systems classified as medium and low shade cocoa agroforestry systems were identified across the studied regions. The medium shade system was more abundant in the dry region and associated to adaptation to marginal climatic conditions. The low shade system showed significantly higher yield in the wet region but no difference was observed between the mid and dry regions. This study highlights the need for optimum shade level recommendation to be climatic region specific.
由于未来几十年加纳可可种植区的气候变化,预计该地区的气候适宜性将会降低。这将威胁到农民的生计和可可产业。为了适应气候变化,需要更好地了解现有的可可生产系统和农民的应对策略。本研究在加纳可可带的一个气候梯度上,对当前的可可生产、收入多元化和遮荫树管理进行了特征描述。目的是:1)比较干旱、中雨和多雨气候区现有的生产和收入多元化情况;2)确定可可农林复合系统中的遮荫树及其在气候梯度上的分布。我们的研究结果表明,在干旱地区,目前的平均可可产量为 288kg ha-1yr-1,显著低于中雨和多雨地区,分别为 712kg ha-1yr-1和 849kg ha-1yr-1。在干旱地区,农民通过非可可作物和非农活动来实现收入来源多元化,而中雨和多雨地区的农民主要依赖可可(占年收入的 80%以上)。在所研究的地区,确定了两种被归类为中低遮荫的可可农林复合系统。中遮荫系统在干旱地区更为普遍,与适应边缘气候条件有关。低遮荫系统在多雨地区的产量显著更高,但在中雨和干旱地区之间没有差异。本研究强调需要根据气候区域的特点,对最佳遮荫水平进行推荐。
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