| 三峡库区支流澎溪河水华高发期环境因子和浮游藻类的时空特征及其关系 |
| 摘要点击 2957 全文点击 1073 投稿时间：2015-09-01 修订日期：2015-11-08 |
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| 中文关键词 澎溪河 水华 水体分层 浮游藻类 环境因子 冗余度分析 |
| 英文关键词 Pengxi River algal blooms stratification phytoplankton environmental factors RDA |
| 作者 | 单位 | E-mail | | 周川 | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716 | zhou-chuan@qq.com | | 蔚建军 | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716 | | | 付莉 | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716 | | | 崔玉洁 | 三峡大学三峡库区生态环境教育部工程研究中心, 宜昌 443000 | | | 刘德富 | 三峡大学三峡库区生态环境教育部工程研究中心, 宜昌 443000 | | | 姜伟 | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716 | | | DouglasHaffner | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716
加拿大温莎大学大湖环境研究中心, 加拿大 安大略省温莎市, N9B 3P4 | | | 张磊 | 西南大学资源环境学院, 重庆 400716
中加三峡水域科学研究中心, 重庆 400716
加拿大温莎大学大湖环境研究中心, 加拿大 安大略省温莎市, N9B 3P4 | zhanglei03@aliyun.com |
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| 中文摘要 |
| 分别在2014年春季和夏季三峡库区水华高发期,在库区北岸最大支流澎溪河流域从其河口处逆流而上至回水末端共布置8个采样点,对浮游藻类和环境因子进行了监测,运用数理统计分析手段,对浮游藻类的群落结构及其与环境因子的关系进行了分析. 结果表明在4月中旬,除河口样点外,其他采样点水体出现分层,但断面多只有温跃层和滞温层,而没有混合层; 上游水体层次间温差高于下游水体; 各采样点的水深以及表层水体(水面向下至0.5 m深的水层)的水温、浊度、pH、电导率、溶解氧、叶绿素a、总氮和总磷的空间分布差异显著(ANOVA,P<0.05); 共检测到浮游藻类25种(属),丰度在(2.76~145.8)×104 cell ·L-1之间,以角甲藻(Ceratium hirundinella)为主要优势藻,鱼腥藻(Anabaena sp.)为次优势藻; 上游接近支流来水的样点S7(63.4×104 cell ·L-1)和S8(145.8×104 cell ·L-1)水华最为严重; 硝酸盐氮、水温、pH、电导率和溶解氧是藻类生长的决定因子. 在7月下旬,水体分层,趋势与春季相似; 各采样点深度和0~0.5 m水层的水温、浊度、氧化还原电位、pH、电导率、叶绿素a、氨氮、硝酸盐氮、总氮和总磷的空间分布仍然差异显著(ANOVA,P<0.05); 共检测到浮游藻类46种(属),丰度在(9.56~278.88)×104 cell ·L-1之间,总体以席藻(Phormidium sp.)为主要优势藻,鱼腥藻(Anabaena sp.)为次优势藻; 下游接近澎溪河河口的样点S2(216.44×104 cell ·L-1)、S3(278.88×104 cell ·L-1)和S4(108.12×104 cell ·L-1)水华严重; 浊度、水深、总氮、氧化还原电位、电导率和溶解氧是藻类生长的决定因子. 水体分层与水华形成有重要关系. |
| 英文摘要 |
| Planktonic algae and Related Environmental Factors were monitored during the period of algal blooms season in 2014 (Spring April 17 and summer 27 July) in Pengxi river, Three Gorges Reservoir. Mathematical statistical tools were used to analyze the community structure of planktonic algae in Pengxi River with its environmental factors. The results of sampling in spring showed that except the estuary site, S1 and the site close by, S2, the waters stratified, but without epilimnion, only had metalimnion and hypolimnion; the upstream sites had larger temperature difference between water layers than did the downstream ones; from all the 8 sampling sites from estuary to upstream, water depth, and the temperature, pH, conductivity, dissolved oxygen, chlorophyll a, TN and TP of the surface layer (0-0.5 m deep) were significantly different (ANOVA, P<0.05). 25 species (genus) of planktonic algae were identified. The abundance of species ranged from 2.76×104 cell ·L-1 to 145.8×104 cell ·L-1. Ceratium hirundinella was the main dominant species, and Anabaena sp. was the sub-dominant species. Algal bloom in upstream sampling sites S7 (63.4×104 cell ·L-1) and S8(145.8×104 cell ·L-1)were relatively serious in spring. Temperature of water, pH, conductivity, dissolved oxygen and NO3- were the key regulatory factors for phytoplankton abundance based on redundancy analysis (RDA). The results of sampling in summer showed similar stratification trends among sites; the depth of the same 8 sampling sites, and their surface layer's temperature of water, turbidity, redox potential, pH, water depth, conductivity, chlorophyll a, NH4+,NO3-,total nitrogen and total phosphorus were significantly different (ANOVA, P<0.05). 46 species (genus) of phytoplanktonic algae were identified. The abundance ranged from 9.56×104 cell ·L-1 to 278.88×104 cell ·L-1. Phormidium sp. was the main dominant species, and Anabaena sp. was the sub-dominant algae. Algal bloom at the lower part of the river, S2 (216.44×104 cell ·L-1), S3(278.88×104 cell ·L-1)and S4 (108.12×104 cell ·L-1) were relatively serious in summer. Turbidity, depth of water, TN, oxidation-reduction potential, conductivity and dissolved oxygen were the key regulatory factors for phytoplankton abundance based on RDA. Stratification had important effect on algal bloom formation. |
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