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- W4245909810 abstract "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." @default.
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- W4245909810 date "2002-01-01" @default.
- W4245909810 modified "2023-09-25" @default.
- W4245909810 title "Validity of Ellenberg indicator values judged from physico-chemical field measurements" @default.
- W4245909810 cites W2524625819 @default.
- W4245909810 doi "https://doi.org/10.1658/1100-9233(2002)013[0269:voeivj]2.0.co;2" @default.
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