Budgets and dynamics of nitrogen and phosphorus in a shallow,
hypereutrophic lake in China.
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| 出 版 社：Journal of Freshwater Ecology [J. Freshwat. Ecol.]. |
| 发表时间：2000 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者：Tang, Huijuan; Xie, Ping |
| 点 击 率：2445 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：Budgets and dynamics of nitrogen and phosphorus in Lake Donghu
were investigated from Oct. 1997 to Sept. 1999. The water
residence time was estimated to be 89 days in 1997-1998 and 124
days in 1998-1999. The total external loadings were 53 g N m
super(-2) yr super(-1) and 3.2 g P m super(-2) yr super(-1) in
1997-1998, and 42 g N m super(-2) yr super(-1) and 3.1 g P m
super(-2) yr super(-1) in 1998-1999. On average, about 80% of
nitrogen and phosphorus input was from sewage outlets, while the
rest was from land runoff and precipitation. Ammonium ion was the
most abundant form of inorganic nitrogen in the sewage. The
nutrient output was mainly through water outflow and fish catch.
The percentages of nutrients in fish were estimated to be
7.8%-11.2% for nitrogen and 47.6%- 49.6% for phosphorus. Lake
Donghu has a very high nutrient retention (63% for nitrogen and
79% for phosphorus) mainly due to its closure and long water
residence time. Sedimentation is an important nutrient retention
mechanism in this lake. Using mass balance method, it was
estimated that denitrification of Lake Donghu involves about 50%
of the retained nitrogen. Lake Donghu is rich in inorganic
nitrogen and phosphorus and showed great seasonal variation.
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