J. For. Sci., 2023, 69(7):305-316 | DOI: 10.17221/133/2022-JFS

Assessment of the Ellenberg quotient as a practical tool for vertical vegetation zonationOriginal Paper

Petr Dujka1,2, Antonín Kusbach1
1 Department of Forest Botany, Dendrology and Geobiocenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic
2 Forest Management Institute Brandýs nad Labem, Branch Kroměříž, Kroměříž, Czech Republic

The Ellenberg quotient (EQ) is a climate index defined as a ratio of the hottest month's temperature and the average annual precipitation sum. The quotient indirectly expresses the relationship between climate and vegetation, and its application is related to the ecological niche of Fagus sp. Although the quotient was curated on the grounds of field research primarily on German vegetation, the possibilities of its utilisation are not limited to the Central European region. The objective of this study is (i) to compare the EQ values calculated for the forest vegetation zones in the Czech Republic with the published data using the ecological niche of Fagus sylvatica; and (ii) to compare the new EQ-based vertical model with field empirical mapping. The study area is the Czech Republic, Central Europe. We used climate data from 1970–2000 and the data of the National Forest Inventory, 2nd cycle (2011–2015), representing an objective data design. Geospatial analytic methods, machine learning (boosting), and verification through statistical testing were performed. The results indicate higher EQ values between the two most substantial spatial frames – the Hercynicum and Carpaticum regions. By comparing empirical mapped units to their climatic potential (in the EQ), a match was found only within the Carpaticum region. The study presents a concretisation of the general climate index for a specific region, adds to the knowledge about the Fagus ecological niche in context with the Central European vegetation, and also points to the EQ's potential for evaluating the concept of vertical differentiation of forest communities, as well as a possible prediction tool for the vegetation migration in context with climate change.

Keywords: European beech; Fagus sylvatica; forest vegetation zones; national forest inventory; zonal concept

Received: September 15, 2022; Accepted: May 25, 2023; Prepublished online: July 20, 2023; Published: July 26, 2023  Show citation

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Dujka P, Kusbach A. Assessment of the Ellenberg quotient as a practical tool for vertical vegetation zonation. J. For. Sci. 2023;69(7):305-316. doi: 10.17221/133/2022-JFS.
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