| 三峡库区神农溪不同时期溶解氧与叶绿素a垂向分布特征 |
| Vertical Distributions of Dissolved Oxygen and Chlorophyll-a in Shennong River Above Three Gorges Reservoir at Low and High Water Levels |
| 投稿时间：2020-06-12 修订日期：2022-03-25 |
| DOI：10.15928/j.1674-3075.202006120171 |
| 中文关键词:三峡库区 神农溪 溶解氧 叶绿素a 分布特征 |
| 英文关键词:Three Gorges Reservoir area Shennong River dissolved oxygen chlorophyll-a distribution characteristics |
| 基金项目:国家自然科学基金重大计划项目（91647207）；国家自然科学基金面上项目（51909135）；国家自然科学基金面上项目（51879099）；国家自然科学基金面上项目（51779128）；中国长江三峡集团有限公司科研项目-长江中游地区村镇污水处理模式研究（202003082） |
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| 中文摘要: |
| 为探究三峡库区支流垂向水环境的分布特征及其影响因素，采用2018年2月（高水位期）和7月（汛期）对三峡水库典型一级支流——神农溪回水区水质监测数据，分析和对比了神农溪不同季节的溶解氧和叶绿素a等指标垂向分布特征，讨论了影响其垂向分布的环境因子。结果表明，神农溪高水位期与汛期的溶解氧含量在0~12 m和0~6 m水体分层现象明显，其表层水体的溶解氧饱和度(SDO)分别为104.04%和171.96%，已经达到过度饱和状态（SDO>100%）；中层水体溶解氧浓度存在分层现象，底层水体溶解氧浓度较稳定，无分层现象。高水位期与汛期的叶绿素a含量在0~10 m水体分层现象明显，表层水体的叶绿素a浓度整体上表现为中度富营养化（5 μg/L
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| 英文摘要: |
| To provide a reference to support environmental protection and ecological restoration, we investigated the vertical distribution and environmental driving factors for dissolved oxygen (DO) and chlorophyll-a (Chl-a) in the Shennong River backwater of Three Gorges Reservoir (TGR) at different water levels. The study was based on 2018 water quality monitoring data for the Shennong River backwater collected in February (winter dry season, high water level in TGR) and July (summer flood season, low water level in TGR). A total of 6 monitoring sites were set, from the Shennong River cove (SN1) to the end of the backwater (SN6), and depth profiles of water environmental factors were obtained by taking measurements at 1 m intervals from surface to bottom. Temperature depth profiles show that the Shennong River backwater was thermally stratified, weakly in the winter and strongly in the summer. DO in the surface water was high in the photic zone, particularly in the summer, and then rapidly declined with depth as decomposition outpaced photosynthesis. This zone of highly variable DO extends from 0-12 m in winter and 0-6 m in summer. In the surface water (epilimnion), the DO saturation (SDO) was above 100% (supersaturated), averaging 104.04% in winter and 171.96% in summer. The DO of the middle layer (mesolimnion) decreased with depth, and then was lower and more uniform in the bottom layer (hypolimnion). As expected, the vertical distributions of Chl-a at both high water (winter) and low water (summer) levels were similar to DO and the Chl-a concentration was consistently very low below 10 m. The average concentrations of Chl-a in the surface water were 11.4 μg/L and 8.7 μg/L, respectively, indicating moderate eutrophication (5 μg/L
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| 田盼,宋林旭,纪道斌,李亚莉,杨凡,郭亚丽.2022.三峡库区神农溪不同时期溶解氧与叶绿素a垂向分布特征[J].水生态学杂志,43(2):1-8. |
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