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对台湾海峡西北部平潭岛海域337个站位表层沉积物中底栖有孔虫进行分析鉴定,结果表明底栖有孔虫丰度、分异度变化较大,所出现的属种类型以玻璃质壳体为主,其次为瓷质壳,胶结壳最少。底栖有孔虫分布受水深、盐度、底质类型、底流和沿岸上升流等因素共同影响。应用‘PAST’软件的因子分析结果表明,该海域底栖有孔虫可划分为四个组合:组合Ⅰ(Hanzawaia-Pseudorotalia-Bolivina)主要分布于水深大于20m的深水区,受水深和底流影响明显;组合Ⅱ(Ammonia beccarii-Elphidiumspp.)主要分布于近岸浅水环境;组合Ⅲ(Quinqueloculina-Ammonia annectens-Spiroloculina)主要分布于海湾内高盐度区,推测受到沿岸上升流影响;组合Ⅳ(Elphidium advenum-Ammonia annectens)分布于组合Ⅰ与组合Ⅲ之间的局部区域,可能受浙闽沿岸流影响较强。
The benthic foraminifera in 337 sediments of Pingtan Island in the northwestern Taiwan Strait was analyzed and identified. The results showed that abundance and diversity of benthic foraminifera varied greatly, Glassy shell-based, followed by porcelain shell, cement shell at least. Benthic foraminiferal distribution is affected by factors such as water depth, salinity, sediment types, underflow and upwelling along the coast. The results of factor analysis using ’PAST’ software showed that the benthic foraminifera in this area can be divided into four groups: the combination Ⅰ (Hanzawaia-Pseudorotalia-Bolivina) is mainly distributed in the deep water area with a depth of more than 20m, which is obviously affected by the water depth and the underflow (Ammonia beccarii-Elphidiumspp.) Were mainly distributed in coastal shallow water environment. The combination Ⅲ (Quinqueloculina-Ammonia annectens-Spiroloculina) was mainly distributed in the high-salinity area within the bay and was presumed to be affected by the upwelling along the coast. -Ammonia annectens) distributed in the local area between the combination Ⅰ and the combination Ⅲ may be affected by the Zhejiang Min coastal flow strongly.