Forest plays an important role in the global carbon cycle by sequestering carbon dioxide and thereby mitigating climate change. In this study, an attempt was made to investigate the effects of land use/land cover (LULC) change (1989–2017) on carbon stock and its economic values in tropical moist Afromontane forests of the Majang Forest Biosphere Reserve (MFBR), south-west Ethiopia. Systematic sampling was conducted to collect biomass and soil data from 140 plots in MFBR. The soil data were collected from grassland and farmland. InVEST modelling was employed to investigate the spatial and temporal distribution of carbon stocks. Global Voluntary Market Price (GVMP) and Tropical Economics of Ecosystems and Biodiversity (TEEB) analysis was performed to estimate economic values (EV) of carbon stock dynamics. Correlation and regression analyses were also employed to identify the relationship between environmental and anthropogenic impacts on carbon stocks. The results indicated that the above-ground carbon and soil organic carbon stocks were higher than the other remaining carbon pools in MFBR. The mean carbon stock (32.59 M tonne) in 2017 was lower than in 1989 (34.76 Mt) of MFBR. Similarly, the EV of carbon stock in 2017 was lower than in 1989. Elevation, slope, and harvesting index are important environmental and disturbance factors resulting in major differences in carbon stock among study sites in MFBR. Therefore, the gradual reduction of carbon stocks in connection with LULC change calls for urgent attention to implement successful conservation and sustainable use of forest resources in biosphere reserves.

中文翻译：

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土地覆盖变化对马江森林生物圈保护区湿润非洲山地森林碳储量的影响

森林通过封存二氧化碳从而缓解气候变化，在全球碳循环中发挥着重要作用。在这项研究中，试图调查土地利用/土地覆盖（LULC）变化（1989-2017）对南部马江森林生物圈保护区（MFBR）热带湿润非洲山地森林碳储量及其经济价值的影响。 -埃塞俄比亚西部。通过系统抽样收集 MFBR 中 140 个地块的生物量和土壤数据。土壤数据是从草地和农田收集的。采用 InVEST 模型来研究碳储量的时空分布。通过全球自愿市场价格（GVMP）和热带生态系统和生物多样性经济学（TEEB）分析来估计碳储量动态的经济价值（EV）。还采用相关和回归分析来确定环境和人为对碳储量的影响之间的关系。结果表明，MFBR 中地上碳和土壤有机碳储量高于其他剩余碳库。2017 年 MFBR 的平均碳储量（32.59 Mt）低于 1989 年（34.76 Mt）。同样，2017年碳储量的EV也低于1989年。海拔、坡度和收获指数是重要的环境和干扰因素，导致MFBR研究点之间碳储量存在较大差异。因此，随着土地利用和土地利用变化而逐渐减少的碳储量，迫切需要关注在生物圈保护区内成功保护和可持续利用森林资源。