| 汝溪河浮游硅藻功能群特征及其与环境因子相关性分析 |
| 摘要点击 2827 全文点击 988 投稿时间：2017-01-13 修订日期：2017-03-03 |
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| 中文关键词 浮游硅藻 功能群 环境因子 汝溪河 三峡水库 |
| 英文关键词 planktonic diatoms functional groups environmental factors Ruxi River Three Gorges Reservoir |
| 作者 | 单位 | E-mail | | 向蓉 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | XSxiangrong@163.com | | 李巧玉 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 喻燚 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 张洪波 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 董聪聪 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 施军琼 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 吴忠兴 | 西南大学生命科学学院, 三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | wuzhx@swu.edu.cn |
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| 中文摘要 |
| 基于不同水文期特点，分别在平水期（2014年4月）、丰水期（2014年7月）、枯水期（2014年12月）对三峡库区支流汝溪河的浮游硅藻及理化参数进行采样监测，应用功能群分类和数理统计分析等手段，探讨汝溪河不同水文期浮游硅藻功能群特征及其与环境因子间的相互关系. 结果表明：3个水文期，汝溪河共发现浮游硅藻功能群10个，分别为A、B、C、D、Lo、MP、P、TB、X3、S1类群，其中种类最多的功能群是MP类群，数量最多的是D类群. 多元逐步回归分析发现，影响平水期功能类群密度最重要的环境因子为总氮（TN）；与丰水期功能群密度显著相关的环境因子为透明度（SD）；浊度（Tur）、碱度和pH以及电导率则是影响枯水期功能群密度的主要环境因子. RDA分析结果显示，影响汝溪河浮游硅藻功能群多样性的主要环境因子含水温（WT）、电导率（Spc）、氧化还原电位（ORP）、溶解氧（DO）、硝态氮（NO3--N）等. 因此，功能群能较好反映汝溪河的生境特点，而氮营养元素对汝溪河浮游植物功能群变化及水质的影响应引起关注. |
| 英文摘要 |
| To elucidate the functional group characteristics of planktonic diatoms and their relationship with environment factors in the Ruxi River, multivariate statistical analysis and functional group classification were conducted in this study. The success pattern of a diatom functional group and its driving factor were analyzed for the Ruxi River, a typical tributary of Three Gorges Reservoir, after the phytoplankton community and environmental variables were investigated at three different stages: level water period (April 2014), dry season (December 2014), and wet season (July 2014), based on the characteristic of water level. The results showed that there were 10 diatom functional groups in the Ruxi River: the A, B, C, D, Lo, MP, P, TB, X3, and S1 groups, and among them, MP was the most groups, but the dominant group was D group. Stepwise multiple regression analysis indicated that ρ(TN) in the water column was the primary factor significantly affecting the densities in the normal water period, whereas turbidity, alkalinity, and pH significantly influenced the functional group densities in the normal water period. In the high water period, however, transparency was the most important environmental factor affecting the functional group densities. Additionally, the results of RDA analysis found that water temperature, electrical conductivity (Spc), oxidation-reduction potential (ORP), ρ(DO), and ρ(NO3--N) were the main environmental factors that influenced the diversity of diatom functional groups in the Ruxi River. These results suggested that functional groups could well reflect the habitat characteristics of the Ruxi River and the effect of the nutrient element, nitrogen, to the success of phytoplankton functional groups and changes of water quality in the Ruxi River should be paid more attention. |
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