Abstract
Floristic research on segetal communities was carried out in 2000 on arable fields in the Skierbieszów Landscape Park and its protected zone. Three communities of segetal weeds in cereal crops, and two communities of segetal weeds in root crops were separated in the arable fields of the Skierbieszów Landscape Park. The community <i>Vicietum tetraspermae typicum</i> commonly occurred in cereal crops on brown soils developed from loess soils. The community <i>Echinochloo-Setarietum</i>, which belongs to root crops, was noted in the same habitat. The greatest richness of species was found in <i>Consolido-Brometum</i> and <i>Lamio Veronicetum politae</i>, with the average of 25 species in one record. Both communities were abundant in rare segetal species which are considered to be endangered in our country: <i>Adonis aestivalis</i>, <i>Euphorbia exigua</i>, <i>Lathyrus tuberosus</i>, <i>Muscari comosum</i>, <i>Thlaspi perfoliatum</i>, <i>Veronica polita</i>, <i>Agrostemma githago</i>.
Highlights
The common use of herbicides and high doses of fertilizers trigger the disappearance of many segetal communities
It occurred on loess soils that belong to good wheat and defective wheat complex
Three segetal communities were separated in cereal crops, in rendzinas and loess soils of the Skierbieszów Landscape Park
Summary
The common use of herbicides and high doses of fertilizers trigger the disappearance of many segetal communities. This concerns especially the communities growing in very poor and acid, or calcerous soil. Species distinctive for these environments disappear, and nitrophilous species thrive. Impoverished communities are formed with one or two species clearly dominating (Anioł - Kwiatkowska , 1990; Trąba and Ziemińska , 2006). Naturalists have been paying attention to the necessity to retain diversity of species in segetal communities (Siciński , 2001).
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