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SCI论文目录 |
Plankton and seston structure in a shallow, eutrophic subtropic Chinese
lake
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| 出 版 社：Archiv fur Hydrobiologie. Stuttgart [ARCH. HYDROBIOL.] |
| 发表时间：1993 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者： Shei, Ping; Lin, Wanlian; Wang, Shaomei; Liu, Jiangkang |
| 点 击 率：2580 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：The seasonal dynamics in the nutrient concentrations, chlorophyll-a amount
(Chl-a), total algal volume (CV) chl-a/CV ratio, seston structure were
studied at two sampling stations in a shallow, highly eutrophicated
subtropic lake (the Guozheng Hu area of the East Lake) on the plain of the
middle basin of the Chang Jiang (the Yangtze River) of China. The lake
ecosystem of the Guozheng Hu area is dominated by two planktivorous fishes,
silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys
nobilis), phytoplankton and zooplankton. Macrophytes are extremely scarce
in this area. Concentrations of the total dissolved nitrogen and phosphorus
in the Guozheng Hu area in 1990 were very high. Fish yield, of which, more
than 90% was composed of silver carp and bighead carp in the Guozheng Hu
area was very high (ca. 1140 kg/ha or 45.6 g/m super(3) in 1990). Grazing
pressure by the fishes on the plankton community is considered to be rather
strong. The annual average biomass of zooplankton was ca. 1/3-1/2 that of
phytoplankton. On the average, dry matter in the living plankton only
constituted ca. 3-7% of the total dry seston, and plankton carbon only
constituted ca. 5-10% of the seston carbon. The present results indicate
that, in the Guozheng Hu area of the East Lake, of the organic part of the
seston, detritus is quantitatively an important constituent, while living
plankton is only a very small component.
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