Fragmentation of agricultural landscape is considered as a threat to biodiversity of many important habitats around the world. Change to the use of land causing loss, isolation and degradation of ecosystems, is one of the main subjects of study in the field of ecology and conservation biology. An appropriate and complex analysis of factors shaping species diversity of the objects in fragmented agricultural landscape may contribute to the understanding and limiting the negative impact of this phenomenon on biocenosis. This paper is a meta-analysis in order to determine the applied research methods and a synthetic representation of the impact of landscape fragmentation on various spatial objects. The aim of the study was to analyse the main assumption of The Theory of Island Biogeography which states that with the decrease of the area of objects, their biodiversity will decrease, while their isolation will increase. An attempt was also made to assess the impact of particular factors that may affect the plant species richness in given objects. The meta-analysis was carried out on the basis of selected criteria for 41 scientific articles in European countries. It was assumed that one cannot unequivocally state the correctness of applying this theory to any type of objects. The conducted study indicated that usually the greatest positive influence on phytodiversity has the size of a given patch, while isolation was assigned a negative impact. The review of landscape research confirmed the thesis that the surface and isolation cannot be unambiguously determined to shape biodiversity in the patches.

Species composition of lawns in the housing estates, planted-among other reasons-in order to diversify the urban landscape, is often modified and enriched with other, spontaneously appearing species. The aim of the present work was to determine the floristic and phytosociological diversity of selected housing estate lawns of three different age groups, in the city of Szczecin, in three neighbouring housing estates (Niebuszewo, Warszewo, and Żelechowa). It was assumed that over the years, lawns are gradually becoming weaker, which may be due to the occurrence of negative anthropogenic factors of increasing intensity. It was found that despite the one designated plant community in all the analysed housing estate lawns (namely, Poa pratensis-Festuca rubra), there are differences between the studied areas, in terms of the number of species occurring therein, and the values of selected ecological (environmental) indicators.