南海中北部沉积硅藻分布的特征与环境的关系

The Relationship Between Diatom Distribution in the Sediment and the Environmental Factors in the Central and Northern Parts of the South China Sea

从南海中北部采集了46个站位的层积硅藻标本,根据硅藻的种类、数量及分布特征,可将该海区分为7个硅藻组合带。由于各海区环境因素的差异,硅藻遗壳含量分布是不同的,从滨岸向深海盆,其数量呈递增趋势,而4000M以下则为放射虫壳体所代替。研究结果表明本海区的硅藻种类组成、数量分布等是与诸如水深、温度、盐度及光照等环境因素有密切关系,此外还受到海流及水团性质的影响。

This paper studied the diatom samples collected frem the surface of sediment in the Central and Northern parts of South China Sea。Based on the diatom frustules, genus content and characteristics of distribution, this area can be divided into 7 groups of diatom compositions, which reflected the features of sediment environment. Due to the diffetences in environmental conditions, the distribution of the different genus and spicies and the contents of relict frustule of diatoms are not the same. From the littoral area to deep sea basin area, the content of diatom frustules is increasingly higher, but at the depth of 4000M, the radiolarians found instead of the diatoms. This study reflects the close relationship between the diatom composition, quantity, distribution and such environmental factors as depth, temperature, saltiness, light penetration. In addition, the ocean current, water character may also influence this relationship.