Lake Tagimaucia Montane Lake as a Potential Late Holocene Environmental Archive in Fiji's Volcanic Highlands

IF 0.7 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY
Pacific Science Pub Date : 2023-01-25 DOI:10.2984/76.3.4
J. Terry, Kunal Singh, M. McKeown
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引用次数: 0

Abstract

Abstract: Lake Tagimaucia, a montane volcanic lake on Taveuni Island, is Fiji's only high-elevation lake. This study examined a lacustrine sediment core to explore the lake's potential as a palaeoenvironmental archive through the Late Holocene. Dating reveals no simple age–depth relationship due to sediment age-reversals. However, phases of fire activity are evidenced by two distinct charcoal bands. Catchment burns were probably related to significant ENSO-driven drought, although fire ignition by volcanic eruptions on Taveuni cannot be ruled out. Above the dominant charcoal band, the sediment profile exhibits notable positive shifts in organic matter, bulk density, δ13C, and C:N ratio. These peaks suggest a phase of accelerated catchment erosion, possibly triggered by post-burn instability. We introduce a conceptual model to explain the influence of sedge peat swamps on lake sedimentation processes. Surrounding sedge-dominated peatlands have extensively encroached Lake Tagimaucia. Floating peat mats, gradually accumulating through time, act as a repository of organic material that is stored directly on the lake surface. Episodes of drought and fire release old organics directly into the lake itself, probably contributing to the complex chronological sequence in the Late Holocene stratigraphy.
塔吉穆西亚-蒙坦湖是斐济火山高地潜在的全新世晚期环境档案
摘要:塔吉穆西亚湖是斐济唯一的高海拔湖泊,位于塔韦尼岛上的一个山地火山湖。这项研究检查了一个湖泊沉积物岩心,以探索该湖在全新世晚期作为古环境档案的潜力。由于沉积年龄的逆转,测年并没有揭示出简单的年龄-深度关系。然而,两个不同的木炭带证明了火灾活动的阶段。集水区烧伤可能与ENSO引发的严重干旱有关,尽管不能排除塔韦尼火山爆发引发的火灾。在主要炭带之上,沉积物剖面在有机质、堆积密度、δ13C和C:N比方面表现出显著的正变化。这些峰值表明集水区侵蚀加速,可能是由燃烧后的不稳定性引发的。我们引入了一个概念模型来解释莎草泥炭沼泽对湖泊沉积过程的影响。周围以莎草为主的泥炭地已经广泛侵占了塔吉穆西亚湖。随着时间的推移,漂浮的泥炭垫逐渐积累,成为直接储存在湖面上的有机物质的储存库。干旱和火灾的爆发将古老的有机物直接释放到湖泊中,这可能是全新世晚期地层中复杂的时间序列的原因之一。
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来源期刊
Pacific Science
Pacific Science 生物-动物学
CiteScore
1.40
自引率
14.30%
发文量
17
审稿时长
3 months
期刊介绍: Pacific Science: A Quarterly Devoted to the Biological and Physical Sciences of the Pacific Region The official journal of the Pacific Science Association. Appearing quarterly since 1947, Pacific Science is an international, multidisciplinary journal reporting research on the biological and physical sciences of the Pacific basin. It focuses on biogeography, ecology, evolution, geology and volcanology, oceanography, paleontology, and systematics. In addition to publishing original research, the journal features review articles providing a synthesis of current knowledge.
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