刚果盆地中部Cuvette近河泥炭地的环境和气候演变

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews Pub Date : 2025-06-03 DOI:10.1016/j.quascirev.2025.109445

Johanna Menges , David Sebag , Judicael Lebamba , Chris Kiahtipes , Hans-Peter Wotzka , Johannes Preuß , Ferdinand Bokomba Bwamangele , Roger Kidebua Lutonadio , Melanie Guardiola , Thierry Adatte , Yannick Stroobandt , Steven Bouillon , Yannick Garcin , Enno Schefuß

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引用次数: 0

摘要

热带泥炭地在全球碳循环中发挥着至关重要的作用，但它们的形成和对环境变化的响应仍然知之甚少。刚果盆地拥有世界上最大的热带泥炭地，在中央库维特（Cuvette Centrale）拥有约300亿吨碳。最初的研究表明，在不同的地貌和水文环境中，泥炭沉积物种类繁多，河流间盆地和河流近端泥炭地的泥炭穹丘分布在水文网络中。在这里，我们提出了一个泥炭地的泥炭核心的全面分析，在靠近蒙博约河附近的库维特中心。通过大量有机碳和氮分析、Rock-Eval®热分析和植物蜡碳和氢同位素组成，我们重建了该泥炭地的演变和相关的过去水文气候条件。我们的发现揭示了泥炭积累的不同阶段，从富含有机碳的河流泛滥平原过渡到森林沼泽，最后到封闭的冠层沼泽森林。Rock-Eval®参数指示泥炭在湿地和沼泽森林阶段的原位积累。在降水增加条件下，泥炭地发生在距今10.6校准千万年左右，而在8.7 cal ka BP左右，泥炭地的陆地化与封闭冠层森林的建立同时发生。值得注意的是，我们还确定了从5 cal ka BP开始的干燥气候条件的趋势，以及之前描述的“幽灵间隔”-泥炭严重分解的间隔-在这个核心中，表明这一时期在Cuvette Centrale不同地区的泥炭地留下了印记。最后，在1.7 ~ 1.5 cal ka BP之间发生了短暂的植被变化，但对泥炭的形成没有影响。在气候演化方面，植物蜡氢同位素（δDn-C29）记录证实了前人观测到的区域气候模式，强调了降水与泥炭地发育之间的密切联系。研究结果与近海刚果扇的δDn-C29记录非常吻合，进一步支持了气候演化的区域性。

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Environmental and climatic evolution of a river-proximal peatland in the Cuvette Centrale, Congo Basin

Tropical peatlands play a crucial role in the global carbon cycle, yet their formation and response to environmental changes remain poorly understood. The Congo Basin, containing the World's largest tropical peatlands, holds about 30 billion tons of carbon in the Cuvette Centrale. Initial studies revealed diverse peat deposits in different geomorphic and hydrologic settings, with extensive peat domes in interfluvial basins and river-proximal peatlands following hydrographic networks. Here, we present a comprehensive analysis of a peat core from a peatland in close vicinity of the Momboyo River within the Cuvette Centrale. Using bulk organic carbon and nitrogen analyses, Rock-Eval® thermal analysis, and plant wax carbon and hydrogen isotope compositions, we reconstructed this peatland's evolution and associated past hydroclimatic conditions.

Our findings reveal distinct phases of peat accumulation, transitioning from an organic carbon-rich river floodplain to a forested marshland, and finally to a closed-canopy swamp forest. Rock-Eval® parameters indicate in-situ peat accumulation in the marshland and swamp forest phases. Peat initiation occurred around 10.6 calibrated kiloanni before present (cal ka BP) under increasing precipitation and around 8.7 cal ka BP the terrestrialization of the peatland coincided with the establishment of a closed canopy forest. Notably, we also identify a trend to drier climatic conditions from 5 cal ka BP onwards and the previously described “Ghost Interval” – an interval of heavily decomposed peat – in this core, indicating this period left its mark across peatlands in different parts of the Cuvette Centrale. Last, a short-lived vegetation change occurred between 1.7 and 1.5 cal ka BP that did not impact peat formation.

Regarding the climatic evolution, the plant wax hydrogen isotope (δD_n-C29) record corroborates regional climatic patterns observed in previous studies, emphasizing the close linkage between precipitation regimes and peatland development. The strong agreement between our findings and a δD_n-C29 record from the offshore Congo fan further supports the regional nature of climatic evolution.

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来源期刊

Quaternary Science Reviews 地学-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

388

审稿时长

3 months

期刊介绍： Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.