DISTRIBUTION PATTERN OF SPOROPOLLEN IN SURFACE SEDIMENTS OF NORTHWESTERN TAIWAN STRAIT AND ITS GEOLOGICAL SIGNIFICANCE
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摘要: 通过对台湾海峡西北部莆田海域沿海338个表层沉积物样品中孢粉的分析,探讨其分布规律及影响因素、孢粉源区、传播机制和沉积环境。研究区内孢粉的分布可划分为沿北西-南东方向展布的4个孢粉区,呈现出高值低值交替分布的状态。孢粉丰度变化受水深和沉积物粒度影响较大。各类孢粉分布的控制因素有所不同。松属花粉的分布受到东北季风和海湾地形的综合影响;栎属等热带亚热带花粉则以河流和沿岸流为主要传播动力;蕨类孢子普遍的高丰度可能是由于其本身易于被海流携带传播,以及人类活动的影响导致沿岸地区蕨类植物广布,从而为其提供了丰富来源,沿岸流可能也为蕨类孢子带来了新来源;以禾本科为主的草本花粉由于不易传播,主要来自于沿岸地区的草本植被。河口或环岸带发生的絮凝作用有利于孢粉的沉积。近海带由于水动力条件减弱,孢粉随着悬浮物的沉积而大量沉积下来。Abstract: Palynological investigation for 338 surface sediment samples taken from the northwestern Taiwan Strait have been conducted in order to reveal the distribution patterns of pollen and spore. The dissemination process and source area of pollen and spore, as well as the local depositional environment are discussed in this paper. Based on the total, arboreal, herbaceous and fern pollen concentrations, the distribution of surface pollen assemblages could be classified into four regions in NW-SE direction. Pollen abundance is mainly affected by water depth and the grain size of sediments. The distribution of Pinus is influenced by the combined effects of the northeast monsoon and topography, while tropical and subtropical arboreal pollen, such as Quercus, is mainly influenced by coastal currents and rivers. Fern spores exhibited higher abundance, probably influenced by ocean currents, coastal currents and human activities. Herbaceous pollen occurs in high percentage around the coasts close to the source areas. The estuaries and coastal regions are the important depositional zones for terrestrial pollen grains due to flocculation.
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Key words:
- sporopollen /
- surface sediments /
- geological significance /
- Taiwan Strait
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