| 千岛湖溶解氧与浮游植物垂向分层特征及其影响因素 |
| 摘要点击 2932 全文点击 1140 投稿时间：2016-06-14 修订日期：2016-10-31 |
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| 中文关键词 千岛湖 溶解氧 浮游植物 垂向分布 理化因子 |
| 英文关键词 Thousand-island Lake dissolved oxygen phytoplankton vertical distribution physical and chemical factors |
| 作者 | 单位 | E-mail | | 俞焰 | 三峡大学水利与环境学院, 宜昌 443002 | 719162536@qq.com | | 刘德富 | 湖北工业大学土木建筑与环境学院, 武汉 430068
河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | | | 杨正健 | 湖北工业大学土木建筑与环境学院, 武汉 430068
河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | 656637841@qq.com | | 张佳磊 | 湖北工业大学土木建筑与环境学院, 武汉 430068
河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | | | 徐雅倩 | 湖北工业大学土木建筑与环境学院, 武汉 430068 | | | 刘晋高 | 湖北工业大学土木建筑与环境学院, 武汉 430068 | | | 严广寒 | 三峡大学水利与环境学院, 宜昌 443002 | |
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| 中文摘要 |
| 根据2015年9月对千岛湖坝前湖泊区5个监测点的监测数据，分析了千岛湖溶解氧、水温、pH、浊度、电导率和浮游植物等指标垂向分布特征，并讨论了水体中溶解氧特殊分层与浮游植物垂向分布的影响因素.结果表明：①溶解氧垂向分布呈现"表层高，底层低"模式，波动范围在1.95~8.25 mg·L-1之间，平均浓度为5.10 mg·L-1.低氧区出现在12~20 m水深，最小值在17 m为1.95 mg·L-1.0~12 m内维持在较高水平，垂向差异较小，12~20 m内出现突变骤减，甚至出现缺氧状态（<4.0 mg·L-1）；在20~38 m内溶解氧恢复正常水平，38 m以下因水深增大浓度减小.pH垂向分布与溶解氧分布完全一致，突变区域出现在同一水深.②浮游植物垂向上生物量差异明显，S1、S2、S3三断面浮游植物生物量呈现中层 > 表层 > 底层，S4、S5两断面浮游植物生物量底层 > 表层 > 中层，浮游植物在20~30 m区域内生长最好.③相关性分析发现溶解氧与水温在温跃层内相关性显著，水体垂向层化作用等物理过程以及浮游生物的活动直接或间接决定了千岛湖湖泊区低氧区的范围与程度.浮游植物与溶解氧、pH显著负相关性，浮游植物在表层主要受水体掺混与溶解氧分层的影响，在底层主要受光照强度的影响. |
| 英文摘要 |
| According to the data collected from the five monitoring sites in front of the dam in Thousand-island Lake in September 2015, the vertical distribution characteristics of dissolved oxygen (DO), water temperature, pH, turbidity, conductivity and phytoplankton were analyzed. The influencing factors of special stratification of DO and vertical distribution of phytoplankton were also discussed. The results showed that:① The vertical distribution of DO presented "the surface is higher than the underlying" mode. DO ranged from 1.95 mg·L-1 to 8.25 mg·L-1 and the average concentration was 5.10 mg·L-1. Low-oxygen zones appeared between 12 m and 20 m and the minimum concentration was 1.95 mg·L-1 at 17 m. The concentration of DO maintained at a high level between 0 m and 12 m and the vertical variance was small. Sudden drop of DO occurred between 12 m and 20 m and there was an anoxic zone (<4.0 mg·L-1). The concentration of DO returned to normal level between 20 m and 38 m. Then it reduced under 38m as the water depth increased. The vertical distribution of pH showed the same trend with that of DO and their sudden change regions appeared in the same zone. ② Vertical phytoplankton biomass displayed significant difference. The phytoplankton biomass of S1, S2 and S3 presented:mid-layer > surface > bottom. But S4, S5 presented:bottom > surface > mid-layer. In addition, the depth between 20 m and 30 m was the best for the growth of phytoplankton. ③ The correlation analysis showed that DO and water temperature in the thermocline were significantly correlative. The range and degree of low-oxygen zones in Thousand-island Lake was determined by physical processes like thermal stratification of water and direct or indirect effects of the plankton. Phytoplankton and DO, pH showed significant negative correlation. The phytoplankton was mainly influenced by turbulent mixing and DO stratification in the surface layer while it was mainly influenced by light intensity at the bottom. |
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