Influences of sea level changes and volcanic eruptions on Holocene vegetation in Tonga
Influences of sea level changes and volcanic eruptions on Holocene vegetation in Tonga
复制标题
海平面变化和火山喷发对汤加全新世植被的影响
DOI：
10.1111/btp.13231
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发表时间：
2023
期刊：
影响因子：
2.1
通讯作者：
Strandberg N
中科院分区：
文献类型：
--
作者：
Strandberg N
在这里，我们调查中晚全新世植被变化在低洼的沿海地区在汤加和海平面的变化和经常性的火山爆发如何影响植被动态的四个岛屿的汤加群岛（南太平洋）。为了调查Ngofe Marsh（'Uta Vava' u）过去的植被和环境变化，我们从一个6.7米长的沉积物岩心中检查了palynomorphs（花粉和孢子），木炭（火）和沉积物特征（火山活动）。放射性碳年代测定表明，这些沉积物是在过去7700年中沉积的。我们将Ngofe沼泽的数据与之前发表的来自Pangaimotu岛Avai 'o 'vuna沼泽、Foa岛Lotofoa沼泽和Ha'afeva岛Finemui沼泽的类似数据进行了整合。植物类群被归类为沿岸的，红树林，雨林，演替/干扰，湿地组，和线性模型被用来研究植被，相对海平面变化和火山喷发（火山灰）之间的关系。我们发现，相对海平面的变化影响了植被的四个岛屿调查。火山爆发没有被确定为植被变化的驱动因素。雨林的减少似乎不是由海平面变化或火山爆发造成的。从所有的网站分析，植被在Finemui沼泽是最敏感的相对海平面的变化。虽然太平洋低洼岛屿上的植被对海平面变化很敏感，但岛屿特征，如面积和海拔，也可能是介导特定岛屿对变化驱动因素的重要因素。
Here, we investigate Mid‐ to Late‐Holocene vegetation changes in low‐lying coastal areas in Tonga and how changing sea levels and recurrent volcanic eruptions have influenced vegetation dynamics on four islands of the Tongan archipelago (South Pacific). To investigate past vegetation and environmental change at Ngofe Marsh (‘Uta Vava’u), we examined palynomorphs (pollen and spores), charcoal (fire), and sediment characteristics (volcanic activity) from a 6.7‐m‐long sediment core. Radiocarbon dating indicated the sediments were deposited over the last 7700 years. We integrated the Ngofe Marsh data with similar previously published data from Avai’o’vuna Swamp on Pangaimotu Island, Lotofoa Swamp on Foa Island, and Finemui Swamp on Ha’afeva Island. Plant taxa were categorized as littoral, mangrove, rainforest, successional/ disturbance, and wetland groups, and linear models were used to examine relationships between vegetation, relative sea level change, and volcanic eruptions (tephra). We found that relative sea level change has impacted vegetation on three of the four islands investigated. Volcanic eruptions were not identified as a driver of vegetation change. Rainforest decline does not appear to be driven by sea level changes or volcanic eruptions. From all sites analyzed, vegetation at Finemui Swamp was most sensitive to changes in relative sea level. While vegetation on low‐lying Pacific islands is sensitive to changing sea levels, island characteristics, such as area and elevation, are also likely to be important factors that mediate specific island responses to drivers of change.
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发表时间：
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