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本文根据我所在南海大陆架综合调查所采集的珠江口外表层沉积样品(112°—115°E,19°—23°N),共研究44个硅藻样(图1)。根据硅藻属种分布差异,可以了解当时的沉积环境,它的遗壳又极易被海流搬运,是研究海流的运动、古地理环境等的重要手段之一。笔者在本海区共鉴定45属164种,统计了其数量(每克干样的硅藻数),根据其参数大小及硅藻植物群在沉积物中的分布,探讨珠江口外海域不同地形地貌、沉积物类型、水动力性质、温度和盐度对沉积硅藻属种及其含量分布的影响,不同组合在各海区中的分布特征,利用硅藻生态特点了解当时的沉积环境。
In this paper, a total of 44 diatom samples (Fig. 1) were studied based on the sediment samples from the outer surface of the Pearl River estuary (112 ° -115 ° E, 19 ° -23 ° N) collected from the comprehensive survey of the South China Sea continental shelf. According to the different distribution of diatoms, we can understand the depositional environment at that time, and the remains of the diatoms are easily transported by sea currents. Therefore, it is one of the important means to study the movement of the current and paleogeographic environment. A total of 164 genera and 45 genera were identified in this area. The number of diatoms per gram of dry sample was counted. Based on the parameters and the distribution of diatom flora in the sediments, Sediment types, hydrodynamic properties, temperature and salinity on sedimentary diatoms species and their distribution, the distribution of different combinations in each sea area, the use of diatom ecological characteristics of the understanding of the current sedimentary environment.