| 浮游绿藻对沉水植物苦草生长的抑制作用 |
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| 引用本文： | 黎慧娟,倪乐意.浮游绿藻对沉水植物苦草生长的抑制作用[J].湖泊科学,2007,19(2):111-117. |
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| 作者姓名： | 黎慧娟 倪乐意 |
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| 作者单位： | 1. 中国科学院水生生物研究所淡水生态与生物技术国家重点实验室,武汉,430072;中国科学院研究生院,北京,100039
2. 中国科学院水生生物研究所淡水生态与生物技术国家重点实验室,武汉,430072 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金 |
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| 摘 要： | 浮游植物大量生长引起的遮光通常被认为是导致富营养湖泊中沉水植物的衰退的主要原因,但是藻类对沉水植物的竞争抑制作用还包括化感作用和无机碳竞争等重要方面,它们可能产生很大影响.为了验证这一观点,本文测定了除遮光以外浮游植物对沉水植物的抑制作用.在相似遮光下(10%-33%),对比研究了不同遮光方式(黑塑料网的物理遮光/浮游绿藻的生物遮光)对苦草(Vallisneria natans)生长和光合作用的影响.结果表明在遮阳网作用下苦草的生长指标(叶数、叶长、叶片叶绿素含量和生物量)和净光合速率都显著高于浮游绿藻作用下苦草,且后一种处理下苦草叶片上端有腐烂现象.由此可见,浮游绿藻对沉水植物生长除了通过遮光抑制生长外,还有较遮光更加严重的抑制作用.这可能是由于浮游绿藻通过化感作用和对可利用光合有效辐射光能和溶解无机碳的竞争优势抑制了苦草的光合作用.
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| 关 键 词： | 绿藻 苦草 化感 净光合速率 溶解无机碳 浮游绿藻 沉水植物 苦草 抑制生长 抑制作用 the growth effects 竞争优势 溶解无机碳 光能 光合有效辐射 利用 严重 植物生长 现象 处理 净光合速率 生物量 叶绿素含量 叶长 |
| 收稿时间： | 2006-03-29 |
| 修稿时间： | 2006-05-29 |
The effects of chlorophyta on the growth of submersed macrophyte Vallisneria natans: a laboratory experiment |
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| LI Huijuan,NI Leyi.The effects of chlorophyta on the growth of submersed macrophyte Vallisneria natans: a laboratory experiment[J].Journal of Lake Science,2007,19(2):111-117. |
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| Authors: | LI Huijuan NI Leyi |
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| Abstract: | Shading of phytoplankton on submersed macrophytes in eutrophic waters is considered to be one of the main causes for the decline of the macrophytes.However,growth inhibition of submersed macrophyte by phyto- plankton may be also due to other important factors including alleloph and DIC competition of phytoplanktion.In order to study whether or not shading is the major effect of phytoplankton inhibiting submerged macrophytes,a labo- ratory experiment was carried out with a submersed macrophyte Vallisneria natans grown in dense phytoplankton wa- ter.Similar shade levels were created either by dark fabric screens or by phytoplankton dominated by chlorophyta (irradiation in the water was 10%-33% that in the air).Growth indices of both number and length of leaves, and biomass of V.natans were measured during the experiment.Chlorophyll a b concentration and net photusyn- thesis rate in leaves were also monitored.Growth and photosynthesis of V.natans under the shade screens were sig- nificantly higher than the plants grown with the chlorophyta,even the leave tips of the plant were found decay in later treatment.The results indicated that chlornphyta suppressed the growth of V.natans in ways other than shad- ing.Allelopathic inhibition of chlorophyta on the net photosynthesis rate of V.natans,competitive advantages for photosynthetic active radiation (PAR) and dissolved inorganic carbon (DIC) of chlornphyta over V.natns were suggested |
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| Keywords: | Chlorophyta VaUisneria natans Pn allelopathy DIC |
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