| 三峡库区不同河段支流丰水期叶绿素a和营养盐的空间分布特征 |
| 摘要点击 1949 全文点击 629 投稿时间：2019-05-23 修订日期：2019-06-22 |
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| 中文关键词 三峡库区 香溪河 神农溪 大宁河 营养盐 叶绿素a |
| 英文关键词 Three Gorges Reservoir Xiangxi River Shennongxi River Daning River nutrient chlorophyll-a |
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| 中文摘要 |
| 三峡水库建设对流域水生态环境产生了一定的影响，使得三峡库区支流库湾频频暴发水华.为了探究夏季三峡库区不同支流水体氮、磷营养盐和叶绿素a浓度的空间分布差异，于2018年6月对三峡库区不同河段的三条支流——香溪河、神农溪和大宁河流域水生态环境进行了调查分析.结果表明香溪河、神农溪和大宁河流域水体中总氮浓度均值依次为1.86、1.90和1.43 mg·L-1.这3条河流水体中总磷浓度均值依次为0.09、0.07和0.05 mg·L-1.单因素ANOVA分析表明，总氮空间差异较显著，表现为神农溪 > 香溪河 > 大宁河；总磷空间分布差异显著，表现为香溪河 > 神农溪 > 大宁河.香溪河、神农溪和大宁河水体中叶绿素a浓度的均值依次为6.41、21.39和9.85μg·L-1.Pearson相关性分析结果显示，这3条河流的叶绿素a浓度与总磷浓度均有显著相关性，其中神农溪与大宁河的叶绿素a浓度还与真光层和混合层之比（Zeu/Zmix）存在显著相关，且香溪河、神农溪和大宁河的氮磷比的均值依次为22.36、26.76和28.6，表明总磷是影响这3条河流水体中浮游植物生长的关键性指标. |
| 英文摘要 |
| The construction of the Three Gorges Reservoir has had certain effects on the ecological environment of the water and serious phytoplankton blooms have occurred in its tributary embayment. To explore the spatial distribution of nitrogen and phosphorus nutrients and chlorophyll-a in different tributaries of the Three Gorges Reservoir, a water quality study (June 2018) was conducted in the Xiangxi River, Shengnongxi River, and Daning River of the Three Gorges Reservoir. The results showed that the average TN in the three tributaries was 1.86 mg·L-1, 1.90 mg·L-1, and 1.43 mg·L-1, respectively, and average TP was 0.09 mg·L-1, 0.07 mg·L-1, and 0.05 mg·L-1, respectively. Single-factor ANOVA analysis showed that the spatial difference in TN was significant and occurred in the following order:Shennongxi River > Xiangxi River > Daning River. There were significant differences in the spatial distribution of TP, which were in the order off Xiangxi River > Shennongxi River > Daning River. The mean concentrations of chlorophyll-a in the three tributaries was 6.41 μg·L-1, 21.39 μg·L-1, and 9.85μg·L-1, respectively. The results from the Pearson correlation analysis, showed that chlorophyll-a concentrations were closely related to TP distribution in all tributaries, but Zeu/Zmix was also correlated with the distribution of chlorophyll-a in the Shennongxi River and Daning River. The ratio of TN and TP concentrations was 22.36, 26.76, and 28.6, respectively, which revealed that TP is a critical and limiting factor affecting phytoplankton growth in its tributary embayment. |
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