黄河口海域夏季浮游植物的分布特征

Distribution Characteristics of Phytoplankton in the Estuary of Yellow River During Summer

根据2004-2010年7个航次（每年8月初至9月上旬）共200个站位的黄河口附近海域生态调查资料,研究其夏季浮游植物种类组成、丰度、优势种类和多样性指数的时空变化。结果表明,夏季黄河口海域共出现浮游植物137种,丰度变化范围为（71.51~2 296.31）×104个/m3,优势种类历年变化较大,出现频率较高的优势种为中肋骨条藻（Skeletonema costatum）、垂缘角毛藻（Chaetoceros laciniosus）、劳氏角毛藻（Chaetoceros lorenzianus）和菱形海线藻（Thalassionema nitzschioides）;多样性指数值远岸区域普遍高于近岸区域,低值区多数位于入海的河口附近。聚类结果显示,调查区域大致可分为3个浮游植物群落。

Investigations, which included 7 voyages and 200 positions, were made every summer from 2004 to 2010. According to the investigated, materials, this paper studied the phytoplankton＇s specific compostion, the a- bundance, the dominant species and the temporal and spatial variation of diversity index. The result showed that a total of 137 phytoplankton species were collected, the range of abundance was from 71. 51 x 104 ind/m3 to 2 296.31 x 104 ind/m3. The composition of dominant species greatly changed, while higher frequency dominant species were Skeletonema costatum, Chaetoceros laciniosus, Chaetoceros lorenzianus and Thalassionema nitzschioide. The diversity index showed an upward trend from near coast to off coast, and most low value areas were near the es- tuary. The clustering result showed that the phytoplankton community could be divided into three groups.