Co-ordinating Editor: Prof. Janos Podani.
Iteratio: calculating environmental indicator values for species and relevés
Version of Record online: 14 JAN 2010
© 2009 International Association for Vegetation Science
Applied Vegetation Science
Volume 13, Issue 3, pages 369–377, August 2010
How to Cite
Holtland, W. J., Ter Braak, C. J. F. and Schouten, M. G. C. (2010), Iteratio: calculating environmental indicator values for species and relevés. Applied Vegetation Science, 13: 369–377. doi: 10.1111/j.1654-109X.2009.01069.x
- Issue online: 1 JUL 2010
- Version of Record online: 14 JAN 2010
- Received 10 December 2008; Accepted 11 November 2009.
- Site conditions;
- Vegetation map;
- Vegetation samples;
- Weighted averaging
Question: Is it possible to translate vegetation maps into reliable thematic maps of site conditions?
Method: This paper presents a new method, called Iteratio, by which a coherent spatial overview of specific environmental conditions can be obtained from a comprehensive vegetation survey of a specific area. Iteratio is a database application which calculates environmental indicator values for vegetation samples (relevés) on the basis of known indicator values of a limited number of plant species. The outcome is then linked to a digitalized vegetation map (map of plant communities) which results in a spatial overview of site conditions.
Iteratio requires the indicator values of a minimum of 10–20% of the species occurring. The species are given a relative weight according to their amplitudes: species with a narrow range are weighted stronger, species with a broad range are weighted weaker.
Conclusion: The method presented here enables a coherent assessment of site conditions on the basis of a vegetation survey and the indicator values of a limited number of plant species.