期刊
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
卷 36, 期 3, 页码 595-603出版社
SPRINGER
DOI: 10.1007/s10653-013-9583-2
关键词
Nutrient stoichiometry; Phytoplankton; Dam construction; Maotiao river
类别
资金
- National Natural Science Foundation of China [41273128, 41021062]
- Shanghai Municipal Education Commission [12YZ017]
Reservoirs created for hydropower production have become an important feature impacting a river. Understanding the effects of river impoundment on the downstream environment is critical to decision-making for water resource protection. The changes caused by impoundment are changes in water quality and the resulting effect on the phytoplankton community structure. The impacts caused by a series of reservoirs along a river are still not well understood. In this study, we conducted an investigation of five reservoirs along the Maotiao River, China. We found that a series of impoundments plays a role in decreasing the phytoplankton biomass in downstream reservoirs. Within the studied area, nitrogen is not a limiting factor for phytoplankton growth. The ratio of silicon to phosphorus (Si:P) can become a major factor in the regulation of phytoplankton community structure. The Si:P ratio increased from upstream to downstream reservoirs, causing a concurrent increase in the percentage of Bacillariophyta, particularly during the winter. In addition, our results indicate that the creation of dams eliminates Si limitation downstream.
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