| 不同水深条件下菹草(Potamogeton crispus)的适应对策 |
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| 引用本文： | 陈正勇,王国祥,吴晓东,王立志,徐伟伟,俞振飞.不同水深条件下菹草(Potamogeton crispus)的适应对策[J].湖泊科学,2011,23(6):942-948. |
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| 作者姓名： | 陈正勇 王国祥 吴晓东 王立志 徐伟伟 俞振飞 |
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| 作者单位： | 南京师范大学地理科学学院江苏省环境演变与生态建设重点实验室,南京,210046 |
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| 摘 要： | 用盆栽试验方法,将菹草石芽种植在水下0.5、1.0、1.5、2.0、2.5、3.0、3.5、4.0m的花盆内,研究了水深梯度对菹草生长、繁殖和生物量分配的影响,得出在不同水深条件下,菹草的能量分配适应对策.结果表明:不同水深未影响菹草石芽的萌发,水深0.5 -4 m各实验组,菹草石芽的萌发率均达到70％以上,各实验组之...
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| 关 键 词： | 菹草 水深 能量分配 株高 |
| 收稿时间： | 2010/11/26 0:00:00 |
| 修稿时间： | 2011/4/13 0:00:00 |
Ecological adaptability of Potamogeton crispus under different water depths |
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| CHEN Zhengyong,WANG Guoxiang,WU Xiaodong,WANG Lizhi,XU Weiwei and YU Zhenfei.Ecological adaptability of Potamogeton crispus under different water depths[J].Journal of Lake Science,2011,23(6):942-948. |
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| Authors: | CHEN Zhengyong WANG Guoxiang WU Xiaodong WANG Lizhi XU Weiwei and YU Zhenfei |
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| Institution: | Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China,Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China,Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China,Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China,Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China and Jiangsu Key Laboratory of Environmental Change and Ecological Con-struction, College of Geography Science, Nanjing Normal University, Nanjing 210046, P.R.China |
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| Abstract: | Submersed macrophyte, Potamogeton crispus, was planted in water at depth of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5 and 4.0 m in pots, with the aim to study the influence of the water depths on plant adaptability in reproduction, biomass allocation and photosynthetic properties and to elicit the way of energy distribution when they are in different water depths.Results showed that the stem length of P.crispus had an evident correlation with water depth and the appropriate water depth for P.crispus growth was 0.5-2.5 m.At the depth of 0.5 and 1.5 m, Potamogeton crispus turion has the largest clones and highest biomass, and the tallest stem length, respectively.Water depth gradients do not affect the germination of P.crispus turions with germination rates > 70% from deep water 0.5 m to 4 m in the experimental group.The adaptability of P.crispus to different water depths has a strong phenotypic plasticity.Height and biomass vary with different water depths for P.crispus.With the increase of water depth and the decrease of light intensity, P.crispus distributes more energy to the growth of plant height so that it can get more luminous energy, which leads to the gradually reduction of energy to reproductive organs and eventually to a balance of energy distribution.The phe-notypic plasticity can adapt to different light stress and what' s more, it can also change the content of the chlorophyll to further re-spond to different light under stress.Below the depth of 3.0 m, the chlorophyll of P.crispus greatly increased to use of energy effi-ciently, which is illustrated by the comparable light response capacity of the experimental group from 3.0-4.0 m and is still not lower than other groups. |
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| Keywords: | Potamogeton crispus water depth energy distribution stem length |
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