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Abstract
Hordeum geniculatum is considered as an obligate halophyte, but exact data about ecological requirements of the species are lacking. Therefore, species response curves of H. geniculatum were obtained for soil reaction and nutrients using Borhidi's indicator values and LOESS smoother response model in the programme CANOCO. Our data showed that H. geniculatum can be regarded as an obligate halophyte preferring slightly to moderately saline soils with relatively high content of nutrients. The Hordeetum hystricis association, indicating grazed vegetation on salt-rich soils, is a plant community that occurs only in central and southeastern Europe. Because this plant community has only been documented in a relatively small area, details about its vegetation ecology are inaccurate. Therefore, the ecology and species composition of this community were studied in three countries within the Pannonian Basin (Hungary, Serbia and Slovakia). A detrended correspondence analysis of 95 relevés from the Pannonian Basin confirmed that the community is characterised by the cover of H. geniculatum above 25%, which may even reach 75%. The association was species-rich; we sampled 91 taxa in 95 relevés. The widespread presence of many accessory species was dependent on environmental conditions, particularly the nutrient and salt content and animal disturbance.
Acknowledgements
We are grateful to M. Sádovský and R. Perić for their help with field research and Z. Melečková as well as R. Hrivnák for their critical comments on the manuscript. We are also indebted to Silvia Herianová and Scott Burgess for language revision. The study was supported by grants of The Ministry of Education VEGA No. 1/0672/08, No. 2/0030/09 and No. 2/0003/12.