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中文摘要：
于2006年春季（5月）、夏季（8月）和秋季（10月）对大、小苏干湖水体进行采样分析,以研究特殊地理位置和气候条件下苏干湖中浮游植物的物种组成和季节变化特征.结果表明,（1）大苏干湖中共有浮游藻类61种（含变种）,其中：硅藻18属,37种;蓝藻11属,15种;绿藻7属,8种;而甲藻仅1属,1种.（2）小苏干湖水体中共发现浮游藻类68种（含变种）,其中：硅藻16属,42种;蓝藻9属,13种;绿藻6属,11种;裸藻及甲藻仅各1属,1种.（3）硅藻在苏干湖水体中始终占据着绝对优势;夏季小苏干湖中蓝、绿藻开始复苏并大量繁殖.各季节两湖中都存在特定的优势属,在春、夏、秋三季,大苏干湖中优势属分别为桥穹藻属、小环藻属、粘杆藻属;而小苏干湖中分别为针杆藻属、菱形藻属、脆杆藻属.纤细舟形藻,长圆舟形藻,湖沼色球藻等为常年优势种,且这种优势物种和季节变化主要是由湖泊中盐度和气温等因素决定的.
英文摘要：
We aimed to research the phytoplankton resource that lied in the special geography position and climate conditions like Suganhu Lake,so as to protect species resource in marsh.Samples were collected three times during spring（May）,summer（Aug.） and autumn（Oct.） in 2006.We have found 61 species（including varieties） in the big Suganhu Lake.Most of them belong to Bacillariophyta,about 37 species and 18 genera.Meanwhile,Cyanophyta constituted by 15 species and 11 genera,Chlorophyta made up of 8 species and 7 genera,Only 1 species and 1 genus existed in Pyrrophyta,However,about 68 species（including varieties） have been found in the small Suganhu Lake,Nearly 42 species and 16 genera in Bacillariophyta.13 species and 9 genera in Cyanophyat,11 species and 6 genera in Chlorophyta,Only 1 species and 1 genus fall into Pyrrophyta and Euglenophyta respectively.In conclusion,Bacillariophyta is the dominant phylum all the time.Nevertheless,Cyanophyat and Chlorophyta began to overgrowth in August.The results indicated that some peculiar dominant genera appeared in different seasons.The dominant genera were Cymbella（Synedra）,Cyclotella（Nitzachia）,and Gloeothece（Fragilaria） respectively in spring,summer and autumn in the Suganhu Lakes.Amphora oralis,Navicula oblonga,Choroococcus limneticus are dominant species that always emerged.The most explainable reason for the variation of these community is that all determined by the lake salinity and temperature.
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