Nelder circles

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As Nelder circles (English Nelder wheels or Nelder fans ) a test arrangement in plant cultivation (especially in forestry ) is called, which is based on methods of statistical test planning. The individual plants (e.g. trees) are planted in concentric circles, with the distance to the outer circles increasing according to precisely defined rules. The method makes it possible to determine the optimal planting distance with regard to a certain target size, e.g. B. to determine the trunk diameter with the help of a single test field. The basic work on this was published in 1962 by the English statistician John Nelder .

In Germany, the process has been used by the Chair of Forest Growth Science at the Technical University of Munich since 2009 on five test areas planted with English oaks ( Kösching , Beilstein , Győr in Hungary, Sant'Agata Bolognese in Italy). The project is funded by the Audi Environmental Foundation.

Individual evidence

  1. ↑ Online communication of November 24, 2011 by the Chair of Forest Growth Science at the Technical University of Munich, accessed November 29, 2011
  2. ↑ Research project "Eichenwald" ( Memento of the original from March 14, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , PDF information sheet from the Audi Environmental Foundation, accessed November 29, 2011 @1@ 2Template: Webachiv / IABot / www.audi-umweltstiftung.de

literature

  • Affleck, David: A Comparative Study of Spatial Analysis Methods for Forestry Nelder Experiments , University of British Columbia, 2001 ( Online Version , PDF, accessed November 29, 2011)
  • Mark, Walter B .: Spacing trials using the Nelder Wheel. in: Proceedings of a work-shop on Eucalyptus in California, June 14-16, 1983, Sacramento, California. Gene. Tech. Rep. PSW 69. ( Online version , PDF, accessed November 29, 2011)
  • Nelder, John A .: New kinds of systematic designs for spacing experiments. Biometrics 18, 1962, pp. 283-307