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SCI论文目录 |
Growth of Potamageton maackianus under low-light stress in
eutrophic water.
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| 出 版 社：Journal of Freshwater Ecology [Journal of Freshwater Ecology]. |
| 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：2346 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：Decline of submersed macrophytes in Lake Donghu of China with the
progress of eutrophication is assumedly due to low light stress by
algae blooming. The author conducted a laboratory experiment to
study the impact of low-light stress on the growth of Potamogeton
maackianus A. Been, a dominant submersed macrophyte of the lake
before the 1970s. Plants were grown for six weeks in aquaria with
Lake Donghu sediment and enriched water. Light delivered to
aquaria was adjusted to simulate the typical Lake Donghu light
intensities that exist at several water depths from 0.6m to 1.7m.
Biomass growth of the plant was inversely related to light
intensity at the simulated depths of greater than or equal to 1.0
m and was negative at the depths of greater than or equal to 1.4
m. These results indicate that photosynthetic light saturation and
compensation points of the plant in Lake Donghu should be ca. 0.9
m and ca. 1.5m depths, respectively. Chlorophyll content, growth
of main shoot, total shoot lengths and density of the plant all
peaked at 1.2-1.3 m simulated depths. These results indicate that
P. maackianus responds to low light stress primarily by elongation
of shoots, and increase of density. Its biomass growth and
nutrient uptake rate did not correlate with the accelerated shoot
growth. Below the light intensities of water deeper than 1.2-1.3
m, shoot growth rate decreased. The flexible tolerant strategy of
P. maackianus to low-light stress suggests that the disappearance
of this plant from the lake was not mainly due to
eutrophication-induced low-light stress.
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