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首页> 外文期刊>Agroforestry Systems >Carbon dynamics in cocoa agroforestry systems in Central Cameroon: afforestation of savannah as a sequestration opportunity
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Carbon dynamics in cocoa agroforestry systems in Central Cameroon: afforestation of savannah as a sequestration opportunity

机译：Cocoa Agroforestry Systems中的碳动力学在Cameroon中部：大草原的植树征作为封存机会

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Afforestation of savannah is suggested as an approach to help addressing climate change mitigation through increased carbon (C) storage. Previous studies in Central Cameroon evidenced farmers' ability to realize afforestation by establishing cocoa-based agroforestry systems (cAFS) on humid savannah. In this forest-savannah transition zone, we studied an 80years chronosequence of cAFS to assess C dynamics. We selected cAFS established after forest or savannah, and we used local forest and savannah patches as controls. Aboveground carbon (AGC) was highest in the forests (118Mg C ha(-1)) and lowest in the savannahs (8Mg C ha(-1)). Systems established after forest (F-cAFS) revealed a mean AGC 40% lower than that of forests and did not evolve with time. The AGC of cAFS established after savannah (S-cAFS) increased with time and reached the mean AGC of F-cAFS (72Mg C ha(-1)) after ca. 75years. Soil organic carbon (SOC) concentration depended on clay content (R-2=0.55, P0.001). The SOC concentration of F-cAFS did not evolve with time and revealed no difference with forest. In S-cAFS, considering a time of about 80years after afforestation, the average annual increase in SOC concentration in the 0-15cm layer ranged from 7.3 parts per thousand in soils with low clay content (10-15%) (R-2=0.60, P0.01) to 9.5 parts per thousand in soils with higher clay content (20-25%). No significant change in SOC concentration was found for the 15-30cm layer. Overall, S-cAFS revealed to store and maintain significant levels of C both in the aboveground biomass and in the soil. Such an afforestation thus appeared as a valuable local strategy to combine cocoa and other perennial plant productions with C storage while avoiding deforestation.
机译：建议大草原的植树征作为一种帮助解决气候变化通过增加的碳（C）储存来缓解缓解的方法。以前在喀麦隆中部研究证明了农民通过在潮湿的大草原上建立基于可可的农学生体系（CAF）来实现造林的能力。在这个森林 - 大草原过渡区，我们研究了80年代的CAFS评估C动力学。我们选择了森林或大草原后建立的CAFS，我们将当地森林和大草原补丁作为控制。地上碳（AGC）在森林中最高（118mg C ha（-1））和大草原中最低（8mg C ha（-1））。森林（F-CAFS）建立的系统揭示了比森林低40％的平均值，并且不会随着时间的推移而发展。在大草原（S-CAF）随时间增加后建立的CAFS AGC，并在CA之后达到F-CAFS的平均AGC（72mg CH（-1））。 75年。土壤有机碳（SOC）浓度依赖于粘土含量（R-2 = 0.55，P <0.001）。 F-CAFS的SOC集中并未随着时间的推移而发展，并没有与森林没有区别。在S-CAFS中，考虑到造林后的时间约为80年，0-15cm层中SOC浓度的平均年增长率从粘土含量低的土壤中千分之一（10-15％）（R-2 = 0.60，P＆ 0.01），粘土含量较高的土壤中达9.5份‰（20-25％）。对于15-30cm层，发现了SoC浓度的显着变化。总体而言，S-CAFS显示在地上生物量和土壤中储存并保持显着水平的C.因此，这种植入造成了将可可和其他多年生植物生产与C储存相结合的有价值的局部策略，同时避免砍伐森林。

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