EM-Algorithm as a tool for structure analysis of stands of the common reed (Phragmites australis)

Ostendorp, Wolfgang; Möller, Joachim

EM-Algorithm as a tool for structure analysis of stands of the common reed (Phragmites australis)

Files

EM_Algorithm_as_a_tool_for_structure_analysis_of_stands_of_the_common_reed.pdf(989.41 KB)

Date

1991

Authors

Ostendorp, Wolfgang

Möller, Joachim

Publication type

Journal article

Published in

Ecological Modelling ; 53 (1991), 1-2. - pp. 27-38. - ISSN 0304-3800

Abstract

The frequency distributions of morphometric and mechanical properties of randomly sampled stalks of seven reed stands at Lake Constance-Untersee are analysed by the Estimation-Maximisation Algorithm. The aim was to look for composed (bimodal) distribution indicating at least two different stem types. In each stand, between one and nine parameters are found to give a bimodal distribution. The two stem types are "flowering shoots" and "non-flowering shoots". The means of nearly all parameters investigated are different at the 1% level of significance. The flowerless shoots are identical with "secondary shoots" and the flowering shoots refer to terminal (= "primary") shoots. The separation of stem types allows investigation of the stand structure and the influence upon it by "rhizome-internal" and "external" factors in more detail.

Subject (DDC)

570 Biosciences, Biology

Keywords

Phragmites australis,Morphometry,Algorithm,Mechanical properties,Flowering,Gramineae,Monocotyledones,Angiospermae,Spermatophyta

Cite This

ISO 690

OSTENDORP, Wolfgang, Joachim MÖLLER, 1991. EM-Algorithm as a tool for structure analysis of stands of the common reed (Phragmites australis). In: Ecological Modelling. 53(1-2), pp. 27-38. ISSN 0304-3800. Available under: doi: 10.1016/0304-3800(91)90139-R

BibTex

@article{Ostendorp1991EMAlg-8679,
  year={1991},
  doi={10.1016/0304-3800(91)90139-R},
  title={EM-Algorithm as a tool for structure analysis of stands of the common reed (Phragmites australis)},
  number={1-2},
  volume={53},
  issn={0304-3800},
  journal={Ecological Modelling},
  pages={27--38},
  author={Ostendorp, Wolfgang and Möller, Joachim}
}

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