| 大宁河水华敏感期浮游植物与环境因子关系 |
| 摘要点击 5029 全文点击 3427 投稿时间：2010-03-22 修订日期：2010-06-17 |
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| 中文关键词 浮游植物 环境因子 大宁河 水华 |
| 英文关键词 phytoplankton environmental factors Daning River algal blooms |
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| 中文摘要 |
| 以三峡支流大宁河水华敏感期 (2008 年 4～5 月)水环境状况的监测数据为基础,运用数理统计分析手段，对浮游植物的分布特征及其与环境因子的关系进行了讨论.结果表明，水温、总氮（TN）、硝酸盐氮 （NO– 3-N）、pH和溶解氧 （DO）时空分布差异显著 （ANOVA，p＜0.05）.浮游植物细胞密度时空分布差异显著 （ANOVA，p＜0.05），最高值出现在大昌样点，最低值出现在长江干流巫峡口样点；7个采样点藻细胞密度的最高值均出现在水华期,发生多藻种同时同地水华的情况.利用相关分析方法分析藻细胞密度与环境因子间的关系，表明藻细胞密度与TN呈显著负相关 （r=-0.789, p＜0.05）; 与NO– 3-N呈显著负相关 （r=-0.825, p＜0.05）；与NO– 2-N呈显著负相关 （r=-0.803, p＜0.05）；表明在调查期间N是影响浮游植物细胞密度的关键因子.利用冗余度分析（redundancy analysis, RDA）浮游植物种类组成与环境因子之间的关系，表明营养盐（TN、 TP、NO– 3-N和NO– 2-N ）、悬浮物和透明度是影响浮游植物组成的主要因素.浮游植物的大量生长对环境因子反馈效应显著,水体的pH值随着藻类细胞密度的增加而上升.大宁河水体水生态环境特征存在显著的空间特征异质性.浮游植物群落结构组成受到水环境特征和空间相邻性的双重影响. |
| 英文摘要 |
| To elucidate relationships between phytoplankton and related environmental factors,phytoplankton and environmental parameters of water quality in the Daning River were conducted using multivariate statistical analysis.Most of the investigated physico chemical parameters ［water temperature,total nitrogen,nitrate-N（NO-3-N）,pH and dissolved oxygen concentration(DO)］ in Daning River are significantly different among those sampling sites(ANOVA,p＜0.05).The results indicate that the Daning River has a comparatively high spatial and temporal heterogeneity in the phytoplankton community composition（ANOVA，p<0.05). The maximum cell density was recorded in Dachang and the minimum density was found at Wuxia-kou sites.Multi-algal species blooms were observed in the same time and place with the maximum density appeared.Correlation analysis was performed to illuminate the relationships between algae density and environmental variables,TN（r=-0.789, p＜0.05）, NO- 3-N（r=-0.825, p＜0.05）and NO- 2-N（r=-0.803, p＜0.05）were negatively correlated with algae density.The results indicate that nitrogen soluble nutrients are key regulatory factors for phytoplankton abundance.The results of redundancy analysis (RDA) indicate that main soluble nutrients（TN， TP，NO-3-N and NO-2-N ）,suspended substance (SS) and transparency contributed significantly to phytoplankton community composition.Phytoplankton growth could enhance the pH value. The environmental characterizations and sample sites adjacency contributed significantly to phytoplankton community composition. |
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