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Effect of management on the mechanical stability of lakeside reeds in Lake Constance-Untersee

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1995

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Acta oecologica. 1995, 16(3), pp. 277-294

Zusammenfassung

  1. Lakeside Phragmites australis reed beds were mown or burnt in winter as a countermeasure against the die-back of reeds in Lake Constance-Untersee.
    2. The effect of winter harvesting and burning on the mechanical resistance of reeds against waves and washes was investigated using the PMR model. This model postulates that the percentage of mechanically damaged shoots of a reed stand is a monotonically declining function of the mean stern diameter, the relative thickness of the stern wall, the modulus of elasticity, and the shoot density per square metre.
    3. Winter harvesting and burning influences the geometric (stern diameter, rel. wall thickness) and the mechanic properties (modulus of elasticity, breaking stress) of culms in each shoot class (primary shoots, secondary shoots, insect infested shoots). The management leads to a shift in stand structure from the dominance of stout primary shoots to the dominance of weaker and thinner secondary shoots. The total shoot density is increased.
    4. Mown and burnt reeds exhibit thinner culms, on average, with lower moduli of elasticity at higher shoot densities. Their power of mechanical resistance (PMR) is substantially reduced in comparison to the untreated reference. According to this model it is assumed that mown or burnt stands lose significantly more culms and biomass by failing than untreated stands.
    5. In Lake Constance-Untersee mechanical factors (waves + washes) are of great significance for the development of the lakeside reed border. In this regard, winter harvesting and burning cannot be recommended as a measure against reed decline.

Zusammenfassung in einer weiteren Sprache

  1. Les populations du roseau Phragmites australis riverain ont été fauchées ou brûlées en hiver pour lutter contre la disparition des roseaux dans le lac mineur de Constance.
    2. L'effet du fauchage et du brûlage hivernaux sur la résistance mécanique des roseaux aux vagues et aux remous a été étudié à l'aide du modèle PRM. Ce modèle suppose que le pourcentage de rejets endommagés mécaniquement dans une phragmitaie est une fonction monotone décroissante du diamètre moyen des troncs, de l'épaisseur relative de la paroi du tronc, du module d'élasticité et de la densité de rejets par mètre carré.
    3. Le fauchage et le brûlage hivernaux influencent les propriétés géométriques (diamètre du tronc, épaisseur relative de la paroi) et mécanique (module d'élasticité, stress du bris) des panicules dans chaque classe de rejets (rejets primaires, rejets secondaires, rejets infestés par les insectes). La gestion induit un renversement dans la structure de la population, allant de la dominance de vigoureux rejets primaires à celle de rejets secondaires plus faibles et plus minces. La densité totale de rejets augmente.
    4. Les roseaux fauchés et brûlés présentent en moyenne des panicules plus fines, avec des modules d'élasticité plus faibles lorsque les densités de rejets sont élevées. Leur pouvoir de résistance mécanique (PRM) est réduit de manière substantielle par rapport au témoin non traité. Conformément à ce modèle, nous admettons que les populations fauchées et brûlées perdent significativement plus de panicules et de biomasse que les populations non traitées.
    5. Dans le lac mineur de Constance, les facteurs mécaniques (vagues et remous) ont une grande importance pour le développement d'une bordure de roseaux sur les rives. De ce point de vue, le fauchage et le brûlage hivernaux ne peuvent être recommandés pour lutter contre le déclin des roseaux.
Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Littoral zone of lakes, Phragmites australis, winter mowing and burning, stand structure, mechanical resistance of reeds

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ISO 690OSTENDORP, Wolfgang, 1995. Effect of management on the mechanical stability of lakeside reeds in Lake Constance-Untersee. In: Acta oecologica. 1995, 16(3), pp. 277-294
BibTex
@article{Ostendorp1995Effec-6994,
  year={1995},
  title={Effect of management on the mechanical stability of lakeside reeds in Lake Constance-Untersee},
  number={3},
  volume={16},
  journal={Acta oecologica},
  pages={277--294},
  author={Ostendorp, Wolfgang}
}
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