Przemiany składu gatunkowego flory segetalnej Wielkopolski w XX wieku - próba analizy porównawczej

Abstract

The obtained results indicate very distinct changes in the trends. They include quantitative changes expressed by a definite superiority of species that in the discussed period decreased their degree of spreading. Furthermore, the study contains a discussion concerning species whose occurrence in arable fields has not been confirmed in the 20th century. The work presents a critical evaluation of transformations that have taken place in the species composition of segetal flora in the area of Wielkopolska during the latest 100 years. The study consists in the comparison of the inventory of vascular plants found in the cultivations in the years 1972-1992 with source data contained in floristic monographs.