水生态学杂志Issue(5)：52-59,8.
黄河上游龙羊峡至积石峡段春秋季浮游植物群落结构及多样性评价
Phytoplankton Community Structure and Diversity Assessment in the Upper Reach of the Yellow River during Spring and Autumn
摘要
Abstract
The 300 km Longyangxia to Jishixia section of the upper Yellow River,provides habitat for a variety of rare and peculiar fish and is important for spawning,feeding and over-wintering.A preliminary study of species composition,biomass and spatial-temporal variation of phytoplankton in this section was conducted at ten sample sites in March (spring)and August (autumn)of 2013.Results shed light on the phytoplankton community struc-ture in the upper Yellow River and provide data to evaluate the aquatic environment and support efforts to use Yellow River water resources sustainably in Qinghai Province.Phytoplankton and water samples for qualitative and quantitative analysis were collected from the water surface (<50 cm).The geographical coordinates,height above sea level,water temperature and pH of each sample site were measured at the same time.Dissolved oxygen (DO) was determined by the iodine method (GB 7489-87)within 24 h.A total of 7 phyla,including 64 species of phyto-plankton,were observed.Bacillariophyta was the dominant phylum,including 25 species (genera)and accounting for 39.1% of the total phytoplankton species,followed by Chlorophyta [19 species (genera),29.7%],Cyano-phyta [12 species (genera),18.8%],Chrysophyta and Pyrrophyta[3 species (genera),4.6%],Euglenophyta and Cryptophyta [1 species (genera),1 .6%].The most commonly encountered species were Cyclotella sp.,Di-atoma vulgare,Asterionella sp.,Fragilaria sp.,Synedra sp.,Synedra acus,Achnanthes sp.,Phormidium sp., Merismopedia sp.,Dinobryon sp.,Chlamydomona sp.,Chlorella sp.,and Pandorina sp.The seven most common species of Bacillariophyta accounted for 53.8% of the 13 dominant species.Seasonal variation of phytoplankton composition was obvious,with higher species richness in autumn,but Bacillariophyta was dominant in both sea-sons.The phytoplankton density ranged from 1.27 ×104 cell/L to 180.48 ×104 cell/L,with an average of 25.33 ×104 cell/L,and the phytoplankton biomass ranged from 0.0049 mg/L to 0.4293 mg/L,with an average of 0.0732 mg/L.The density and biomass of Bacillariophyta accounted for 70.7% and 77.9% of the total phyto-plankton community.The phytoplankton biomass was larger in autumn than in spring.The mean Shannon-Wiener diversity index,Pielou evenness index and Margalef richness index were 2.21,0.73,and 0.66,respectively,with the Shannon-Wiener diversity index and Margalef richness index higher in autumn,while the Pielou evenness index higher in spring.In conclusion,the phytoplankton community at Longyangxia to Jishixia section in the upper reach of the Yellow River was relatively stable and the species distribution was even.The characteristics of the phyto-plankton community structure combined with the phytoplankton as water quality indicators indicated that the water quality of this section was oligotrophic and aquatic environment was good.关键词
黄河上游/浮游植物/群落结构/生物多样性Key words
the upper reach of the Yellow River/phytoplankton/community structure/diversity分类
生物科学引用本文复制引用
陈燕琴,申志新,刘玉婷..黄河上游龙羊峡至积石峡段春秋季浮游植物群落结构及多样性评价[J].水生态学杂志,2014,(5):52-59,8.基金项目
全国渔业生态环境监测青海区项目。 （）
