Plant cover was visually estimated by five observers in a species-rich grassland in the Bílé Karpaty Mts., Czech Republic, in seven plots ranging from 0.001 to 4 m2. Variation of total plant cover among the observers was high at small scales, but much lower at larger scales. Differences between visual estimates of plant cover of individual species made by different observers were affected by plot size, total cover and morphology of particular plants. CV of the cover of individual species ranged from 0 to 225% and decreased with increasing plot size. For abundant plants the CV attained ca. 50%, independent of plot size. In spite of a very high number of sterile plants with similar leaf morphology and colour, the observed variation in cover estimates in the studied grassland was comparable with results reported from other vegetation types. Differences between estimates by individual observers were often larger than usual year to year changes in undisturbed grasslands.
Pracoviště
Botanický ústav
Kontakt
Martina Bartošová, martina.bartosova@ibot.cas.cz, ibot@ibot.cas.cz, Tel.: 271 015 242 ; Marie Jakšová, marie.jaksova@ibot.cas.cz, Tel.: 384 721 156-8
Rok sběru
2005
Počet záznamů: 1
openseadragon
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