南极半岛西北海域表层沉积物中硅藻的初步研究

本文对南极半岛西北海域22个表层沉积物中的硅藻进行了初步研究,鉴定出硅藻82种.根据硅藻的数量分布和生态特征,将本区硅藻分为三个组合;1.Yhalassiosiraantarctica—Charcatia actionchilus—Eucampia balautium组合.2.Th.antarctica——Nitzschiakerguelensis—Coscinodiscus lentignosus组合.3.Coscinodiscus lentiginosus——Eucampiabalaustium—Nitzschia kerguelesis—Schimperiella antarctica组合.文章还通过沉积物中和水体中硅藻的对比,水动力状况,以及海水对硅藻壳体的溶解作用等特征.讨论了区内硅藻壳体的沉积作用.

A STUDY OF DIATOMS IN SURFACE SEDIMENTS FROM THE NORTHWESTERN SEA AREA OF ANTARCTIC PENINSULA

Diatoms in 22 surface sediment samples from the northwestern sea area of Antarctic Peninsula are studied. 82 species of diatoms are examined. The maximum abundance of diatoms ( > 50000 / g) were found in both the middle part of the Bransfield Strait and the deep sea area northwest of the South Shetlands. Medium abundance of diatoms (6000-50000 / g) is observed in the samples from the shallow area of Maxwell bay, the southern sea area of Livingston Island and northwestern shore zone of the Antarctic Peninsula. Low content of diatoms ( < 6000/g) was found in shallow sea area of South Shetlands and northern sea area of Parmer Islands. According to their abundance and ecological charcteristics the diatoms can be divided into three assemblages: 1. Thalassiosira antarctica-Charcatia actinochilus-Eucampia Balaustium. 2. Th. antarctica-Nitzschia kerguelensis-Coscinodiscus lentiginosus. 3. Cos. lentiginosus-E. balaustium -Nitzschia kerguelensisi-Schimperilla antarctica. On the basis of comparison of diatoms in the surface sediments with diatoms in the water and hydrodynamic condition as well as dissolution of diatoms, the sedimentation of the diatioms is discussed in this paper.