HYDROMAN: Impacts of hydrological changes versus human activity on Central-West African forests during the Holocene

HYDROMAN:全新世期间水文变化与人类活动对中西非森林的影响

基本信息

项目摘要

Central-West Africa hosts the second largest contiguous expanse of moist tropical forest in the world, which is currently under severe threat of humans through deforestation and forest fires. To understand the underlying processes controlling changes within tropical forests of Africa, it is important to determine the drivers responsible for the past forest disturbances. During the Holocene (the last 11,500 years) those tropical forests underwent alternating periods of expansion and contraction, driven by climate variability, although during the last ~3000 years human activity associated with the spread of the Bantu-speaking people may have had an additional effect. However, the existence of marked episodes of human disturbances in the past remains highly ambiguous. To resolve the drivers and mechanisms, which have affected the Central-West African forests during the Holocene, I propose to analyze novel climate-proxies directly recording changes in the hydrological cycle in combination with vegetation-proxies and indicators of anthropogenic disturbances. I will use molecular-based proxies, particularly, compound-specific hydrogen and carbon isotope ratios, on lake-sediment cores from Cameroon. I will apply a newly developed regional transfer function of sedimentary lipid biomarker hydrogen isotope values, which were found to accurately record the modern variability in the hydrological cycle. Changes in vegetation composition (e.g., C3 versus C4 plants) will be estimated using lipid biomarker carbon isotope values while past anthropogenic disturbances will be identified by combining X-ray fluorescence scanning and specific organic tracers for agricultural activities, erosion, and biomass burning. This complete dataset will allow constructing a robust paleo-environmental framework to ultimately test the role of climate change and human activity on the evolution of forests in Central-West Africa during the Holocene. The findings of how these drivers affected the structure and composition of past tropical forests will help to predict how future global changes would affect the present forests in the region.
中非-西非拥有世界上第二大连续的潮湿热带森林,目前由于森林砍伐和森林火灾而受到人类的严重威胁。为了了解控制非洲热带森林变化的潜在过程,确定造成过去森林扰动的驱动因素是很重要的。在全新世(最近11500年)期间,这些热带森林在气候变化的驱动下经历了扩张和收缩的交替时期,尽管在最近~3000年期间,与班图语人的传播有关的人类活动可能产生了额外的影响。然而,过去人类干扰的显著事件的存在仍然非常模糊。为了解决在全新世期间影响中非-西非森林的驱动因素和机制,我建议结合植被指标和人为干扰指标,分析直接记录水文循环变化的新型气候指标。我将在喀麦隆的湖泊沉积物岩心上使用基于分子的代用物,特别是化合物特定的氢和碳同位素比率。我将应用新开发的沉积脂质生物标志物氢同位素值的区域传递函数,该函数被发现可以准确记录水循环中的现代变异性。植被组成的变化(例如,C3与C4植物)将使用脂质生物标志物碳同位素值进行估计,而过去的人为干扰将通过结合x射线荧光扫描和农业活动、侵蚀和生物质燃烧的特定有机示踪剂来识别。这个完整的数据集将构建一个强大的古环境框架,最终测试全新世期间气候变化和人类活动对中非-西非森林演变的作用。关于这些驱动因素如何影响过去热带森林的结构和组成的研究结果将有助于预测未来的全球变化将如何影响该地区现有的森林。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Early anthropogenic impact on Western Central African rainforests 2,600 y ago
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Dr. Yannick Garcin其他文献

Dr. Yannick Garcin的其他文献

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{{ truncateString('Dr. Yannick Garcin', 18)}}的其他基金

Reconstructing tropical African hydrology using hydrogen isotope ratios of lacustrine sedimentary biomarkers: a calibration transect across Cameroon
利用湖泊沉积生物标志物的氢同位素比重建热带非洲水文:喀麦隆的校准样线
  • 批准号:
    160487544
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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    32.0 万元
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    面上项目

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