Ecology of Dactylorhiza majalis (Rchb.) Hunt. et Summerh. population as environmental changes indicator in Eastern Sudety Mts. Pt. 1. The ecology of population
2002
Pokorny, J. (Akademia Rolnicza, Wroclaw (Poland). Katedra Botaniki i Fizjologii Roslin), E-mail: [email protected]
The field researches was carried out in 1999-00 in Krowiarki Mts. (Eastern Sudety Mts.). The object of this researches was 5 natural populations of marsh orchid (Dactylorhiza majalis). Marsh orchid similar to many orchids is the stenobiont species, and then is exposure to extinction. In this work was examined the influence of habitat and anthropogenic factor on changes of individuals and group characteristics of population. The principial aim of this study was the prove of population as indicators of changes in environments of Sudety Mts. This orchid occurrence in seminatural plant community, which with deficiency of using, change for habitat of extensive plants. This expansive plants restricted sunlight for orchids. Significant influence on groups characteristic, especially number of population, have humidity of soil. Dactylorhiza majalis accumulated near water seepage, and plants occurrenced with this orchid formed tufts. Eutrophication of seedling have a negative influence on structure of population
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