滇池北部湖区浮游植物时空格局及相关环境因子
THE SPATIO-TEMPORAL PATTERN OF PHYTOPLANKTON IN THE NORTH BASIN OF LAKE DIANCHI AND RELATED ENVIRONMENTAL FACTORS
查看参考文献21篇
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文摘
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为研究滇池北部湖区浮游植物的时空格局,探讨影响格局形成的关键影响因子,2008年12月至2009年6月,在滇池北部湖区选择6个点位,共开展了24次采样,调查并分析了浮游植物群落及其相关理化参数。通过比对滇池全湖周年监测数据,研究发现,北部湖区叶绿素a浓度从12月中旬开始下降,2月中旬降至最低值26.5μg/L,5月中旬达到最大值530.5μg/L。调查期间共鉴定出浮游植物74属97种,其中绿藻53种,蓝藻20种,硅藻17种,隐藻2种,金藻2种,甲藻1种,裸藻2种。蓝藻生物量在12月、3月至6月期间占优势,12月份优势种为绿色微囊藻(Microcystis viridis),3月至5月为水华束丝藻(Aphanizomenon flos-aquae),6月为惠氏微囊藻(Microcystis wesenbergii)。硅藻在1月占优势,优势种为颗粒直链藻最窄变种(Melosira granulata var.angustissima)。研究结果表明,水温高于14℃以上,微囊藻生物量迅速增加;束丝藻生物量随温度增加而增加,高于22℃时迅速减少。北部湖区6个点位浮游植物的空间差异显著,D1、D4号点微囊藻、束丝藻生物量显著高于其他四个点(P<0.01),D2、D5号点广缘小环藻生物量显著高于其他四个点(P<0.01)。研究结果显示,在富营养化严重的滇池北部湖区,水温可能为影响浮游植物种类组成及生物量的关键因子,浮游植物水平分布的差异主要由气象因素和水体营养盐共同决定。 |
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其他语种文摘
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To research spatio-temporal pattern of phytoplankton in the north basin of Lake Dianchi and to find out the key factor that influence the pattern,investigations were conducted 24 times at 6 sampling sites from December 2008 to June 2009.The composition and densities of phytoplankton were measured and canonical correspondence analysis(CCA) was applied to explore the relationship between phytoplankton species and the environmental parameters.By comparing annual monitoring data in Dianchi Lake,chlorophyll a concentration in the north basin started to decline at mid-December,reached the minimum(26.5 μg/L) in mid-February and the maximum(530.5μg/L) in mid-May.A total of 97 phytoplankton taxon,belonging to 74 genera were identified,consisting of 53 species of green algae,20 species of blue-green algae,17 species of diatoms,2 species of cryptomonad,2 species of both golden algae and euglenoids,and only 1 species of dinoflagellates.Cyanobacterial biomass was dominant in December 2008 and from March 2009 to June 2009.Dominant species of Cyanobacteria were Microcystis viridis in December 2008,Aphanizomenon flos-aquae from March to May 2009,and Microcystis wesenbergii in June 2009.Diatoms peaked in January and dominant species were Melosira granulata var.angustissima.The results showed that the biomass of Microcystis increased rapidly when the water temperature was higher than 14℃;the biomass of Aphanizomenon increased with temperature while decline rapidly when water temperature was higher than 22℃.Phytoplankton distribution at the 6 sampling sites in the north basin of the Dianchi Lake was significantly different.Biomass of Microcystis and Aphanizomenon at D1 and D4 were significantly higher than that of other four sampling sites(P<0.01),while biomass of D2 and D5 were significantly higher than that of the other four sampling sites(P<0.01).The results indicated that,in the severe eutrophic north basin of Lake Dianchi,water temperature may be the key factor affecting the phytoplankton composition and biomass;the meteorological factors,together with uneven nutrients concentration,were considered to be the main driving forces determining the horizontal distribution of phytoplankton. |
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来源
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水生生物学报
,2012,36(5):946-956 【核心库】
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关键词
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滇池
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蓝藻水华
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浮游植物
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时空格局
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环境因子
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种群演替
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地址
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中国科学院水生生物研究所, 淡水生态与生物技术国家重点实验室, 武汉, 430072
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中南大学生物科学与技术学院, 长沙, 410013
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语种
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中文 |
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ISSN
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1000-3207 |
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学科
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普通生物学 |
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基金
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国家自然科学基金-云南联合基金
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国家973计划
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水专项课题资助
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文献收藏号
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CSCD:4646029
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