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SCI论文目录 |
Effects of Water Column Nutrient Enrichment on the Growth of
Potamogeton maackianus A. Been
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| 出 版 社：Journal of Aquatic Plant Management [J. Aquat. Plant Manage.]. |
| 发表时间：2001 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者：Ni, L |
| 点 击 率：2433 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：Laboratory aquarium experiments were conducted to study the
effects of water column nutrient enrichment on the growth of
Potamogeton maackianus A. Been, a dominant submersed macrophyte in
Lake Donghu before the 1970s. The plant was grown in fertile
sediment, gradients of water nutrients and different shade
intensities for 40 days. At the end of the experiment, redox
potential of the sediment was negatively related to the water
nutrient concentration, while nitrogen and phosphorus
concentration, and peroxidase activity of the plant tissue was
positively related to the nutrient gradient. Plant growth reduced
at light levels corresponding approximately to the depth range of
0.9-1.5 m given current water transparency within Lake Donghu.
Within this stress zone, plant chlorophyll content, total shoot
length increased primarily with the increased stress and peaked at
1.2 to 1.3 m depths, showing a narrower adaptive range of the
plant than the low light stress range. The present study indicates
that growth of P. maackianus is strongly inhibited by consequences
of nutrient enrichment in water. Thus, eutrophication in Lake
Donghu during 1970s may have played an important role in the
disappearance of this species from the lake.
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