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首页> 外文期刊>Aquatic Sciences >Chara can outcompete Myriophyllum under low phosphorus supply
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Chara can outcompete Myriophyllum under low phosphorus supply

机译：在磷供应不足的情况下，Chara可以战胜Myriophyllum

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摘要

In the course of re-oligotrophication in Lower Lake Constance, Germany, the tall-growing angiosperm Myriophyllum spicatum has been almost replaced by dense and lower-growing charophytes. We hypothesise that Chara globularis negatively affects the performance of M. spicatum due to density competition and nutrient interference. Intra- and interspecific competition was assessed using a response surface experimental design with different densities of both species in mono and mixed stands in an outdoor mesocosm experiment. After 8 weeks, we measured the growth and various functional traits of both species, including stoichiometry, ash-free dry mass and dry-matter content, and for Af. spicatum, additionally chlorophyll content, leaf-mass fraction, formation of autofragments, and root/shoot ratio. With increasing density, C. globularis reduced the growth of M. spicatum much more strongly than that of conspecifics. Increasing density of C. globularis led to a lower chlorophyll a to b ratio and lower nitrogen content based on ash-free dry mass in M. spicatum as well as reduced autofragmentation. Established C. globularis meadows can negatively affect tall-growing angiosperms such as M. spicatum when the environmental conditions, such as low phosphorus availability and high water-clarity, are appropriate. These findings have implications for the management of lakes, specifically those where a nuisance growth of tall macrophytes occurs, e.g. in systems where M. spicatum is invasive.
机译：在德国下康斯坦茨湖的低营养化过程中，高被子植物Myriophyllum spicatum几乎被高密度和低生长的藻类所取代。我们假设Chara globularis由于密度竞争和养分干扰而对球根分枝杆菌的性能产生负面影响。种间和种间竞争是使用响应表面实验设计进行评估的，其中在室外中观实验中，单一和混合林中两种物种的密度都不同。 8周后，我们测量了两个物种的生长和各种功能性状，包括化学计量，无灰干物质和干物质含量以及Af。香料，叶绿素含量，叶质量分数，自发碎片的形成以及根/茎比。随着密度的增加，球状梭状芽胞菌比特异性菌种更强烈地减少了球形分枝杆菌的生长。球孢梭菌密度的增加导致叶绿茶中叶绿素a与b的比率降低，氮含量降低，这是基于角垢分枝杆菌的无灰干质量以及自体碎片减少​​所致。在适宜的环境条件下（如磷利用率低和净水度高），已建立的球形小球藻草甸会对高生长的被子植物（如尖头分枝杆菌）产生负面影响。这些发现对湖泊的管理具有重要意义，特别是那些对高大植物有害生长的湖泊。在角膜分枝杆菌具有侵入性的系统中。

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  • 来源
    《Aquatic Sciences》 |2013年第3期|457-467|共11页
  • 作者

    Doreen Richter; Elisabeth M. Gross;

  • 作者单位

    Limnological Institute, University of Konstanz, Mainaustrasse 252, 78464 Konstanz, Germany;

    Limnological Institute, University of Konstanz, Mainaustrasse 252, 78464 Konstanz, Germany,Laboratoire Interdisciplinaire des Environnements Continentaux(LIEC) UMR 7360 CNRS, Universite de Lorraine, Campus Bridoux, 8, Rue du General Delestraint, 57070 Metz, France;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Competition; Ecological stoichiometry; Functional traits; Re-oligotrophication; Submerged macrophytes;

    机译：竞争;生态化学计量;功能特征;再寡营养化;沉水植物;

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