Validity of Ellenberg indicator values judged from physico-chemical field measurements
Article first published online: 24 FEB 2009
2002 IAVS - the International Association of Vegetation Science
Journal of Vegetation Science
Volume 13, Issue 2, pages 269–278, April 2002
How to Cite
Wamelink, G.W.W., Joosten, V., van Dobben, H.F. and Berendse, F. (2002), Validity of Ellenberg indicator values judged from physico-chemical field measurements. Journal of Vegetation Science, 13: 269–278. doi: 10.1111/j.1654-1103.2002.tb02047.x
- Issue published online: 24 FEB 2009
- Article first published online: 24 FEB 2009
- Received 17 April 2001; Revision received 15 February 2002; Accepted 14 March 2002.
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Abstract. The relationship between mean Ellenberg indicator values (IV) per vegetation relevé and environmental parameters measured in the field usually shows a large variation. We tested the hypothesis that this variation is caused by bias dependent on the phytosociological class. For this purpose we collected data containing vegetation relevés and measured soil pH (3631 records) or mean spring groundwater level (MSL, 1600 records). The relevés were assigned to vegetation types by an automated procedure. Regression of the mean indicator values for acidity on soil pH and the mean indicator values for moisture on MSL gave percentages explained variance similar to values that were reported earlier in literature. When the phytosociological class was added as an explanatory factor the explained variance increased considerably. Regression lines per vegetation type were estimated, many of which were significantly different from each other. In most cases the intercepts were different, but in some cases their slopes differed as well. The results show that Ellenberg indicator values for acidity and moisture appear to be biased towards the values that experts expect for the various phytosociological classes. On the basis of the results, we advise to use Ellenberg IVs only for comparison within the same vegetation type.